US6754286B2
Expired / Lapsed
US
⏱️ 0.0 years remaining
Transmit diversity method and system
Assignee: Qualcomm Inc
•
Filing: 2000-12-18
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Granted: 2004-06-22
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Expires: 2020-12-18
Abstract
Abstract The invention relates to a transmit diversity method for a wireless communication system comprising a transmitting element and at least one receiver, wherein a transmission signal is transmitted from the transmitting element to the at least one receiver in accordance with a weight information determined in response to a feedback information. The feedback information is derived from the response at the at least one receiver to the transmission signal, and is fed back using multiplexed feedback signals. Alternatively, the weight information may be determined at the transmitting element by filtering said feedback information and quantizing the filtered feedback information to a desired quantization constellation. Thus, multiple quantization constellations and combinations thereof and/or constellation specific feedback subchannels can be used for channel probing, such that the total feedback resolution can be enhanced, while maintaining low signaling capacity of the feedback channel.
Inventors
- 👤 Ari Hottinen
- 👤 Risto Wichman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 15:45
CPC Classifications
H; H04; H04B; H04B7/00; H04B7/02; H04B7/04; H04B7/06; H04B7/0613; H04B7/0615; H04B7/0619; H04B7/0621; H04B7/0634; H04B7/0602; H04B7/0608; H04B7/061; H04B7/0636; H04L; H04L1/00; H04L1/02; H04L1/06; H04W; H04W52/00; H04W52/04; H04W52/38; H04W52/42
Claims Analysis
Total Claims: 82
Claim 1
Independent Claim
101 words
A transmit diversity method for a wireless communication system comprising a transmitting element and at least one receiver, said method comprising the steps of: a) transmitting from said transmitting element to said at least one receiver a transmission signal in accordance with a weight information determined in response to a filtered feedback information, wherein said weight information is determined by quantizing said filtered feedback information to a desired quantization constellation; b) deriving said filtered feedback information from the response at said at least one receiver to said transmission signal; and c) feeding back said filtered feedback information using multiplexed feedback signals.
Claim 2
Dependent Claim
101 words
A transmit diversity method for a wireless communication system comprising a transmitting element and at least one receiver, said method comprising the steps of: a) transmitting from said transmitting element to said at least one receiver a transmission signal in accordance with a weight information determined in response to a filtered feedback information, wherein said weight information is determined by quantizing said filtered feedback information to a desired quantization constellation; b) deriving said filtered feedback information from the response at said at least one receiver to said transmission signal; and c) feeding back said filtered feedback information using multiplexed feedback signals.
Claim 3
Dependent Claim
23 words
A method according to claim 1 , wherein said feedback information is used for controlling a transmit weight of one of two antennas.
Claim 4
Dependent Claim
34 words
A method according to claim 2 , wherein said feedback information contains a first information on the transmission power of said two antennas and a second information on the phase of said two antennas.
Claim 5
Dependent Claim
24 words
A method according to claim 3 , wherein said first information or said second information or both are separately filtered at said transmitting element.
Claim 6
Dependent Claim
20 words
A method according to claim 1 , wherein said feedback information is used for controlling transmit weights of two antennas.
Claim 7
Dependent Claim
22 words
A method according to claim 5 , wherein control commands for controlling said two antennas are transmitted alternately to said transmitting element.
Claim 8
Dependent Claim
15 words
A method according to claim 1 , wherein said transmitting element comprises an antenna array.
Claim 9
Dependent Claim
23 words
A method according to claim 7 , wherein said feedback information is used for controlling the direction of transmission of said antenna array.
Claim 10
Dependent Claim
20 words
A method according to claim 8 , wherein the direction of transmission is derived from at least one feedback signal.
Claim 11
Dependent Claim
25 words
A method according to claim 9 , wherein the direction of transmission is derived from a phase estimate of at least one extracted feedback signal.
Claim 12
Dependent Claim
27 words
A method according to claim 1 , wherein said weight information and/or a direction of transmission are determined on the basis of a feedback signal filtering operation.
Claim 13
Dependent Claim
21 words
A method according to claim 11 , wherein a transmission filtering is adapted to a transmission channel characteristic and changed dynamically.
Claim 14
Dependent Claim
31 words
A method according to claim 11 , wherein the filter characteristic of said filtering operation is controlled based on a signaling between said transmitting element and said at least one receiver.
Claim 15
Dependent Claim
20 words
A method according to claim 1 , wherein a reliability of said multiplexed feedback signals is used for weight determination.
Claim 16
Dependent Claim
108 words
A transmit diversity method for a wireless communication system comprising a transmitting element and at least one receiver, said method comprising the steps of: a) transmitting from said transmitting element to said at least one receiver a transmission signal in accordance with a weight information determined in response to a feedback information; b) deriving said feedback information from the response at said at least one receiver to said transmission signal; and c) feeding back said feedback information using multiplexed feedback signals; wherein said multiplexed feedback signals comprises at least a first feedback signal having a first quantization constellation and a second feedback signal having a second quantization constellation.
Claim 17
Dependent Claim
108 words
A transmit diversity method for a wireless communication system comprising a transmitting element and at least one receiver, said method comprising the steps of: a) transmitting from said transmitting element to said at least one receiver a transmission signal in accordance with a weight information determined in response to a feedback information; b) deriving said feedback information from the response at said at least one receiver to said transmission signal; and c) feeding back said feedback information using multiplexed feedback signals; wherein said multiplexed feedback signals comprises at least a first feedback signal having a first quantization constellation and a second feedback signal having a second quantization constellation.
Claim 18
Dependent Claim
22 words
A method according to claim 15 , wherein said at least first and second feedback signals are transmitted in different time slots.
Claim 19
Dependent Claim
19 words
A method according to claim 15 , wherein said first and second feedback signals are transmitted using different codes.
Claim 20
Dependent Claim
51 words
A method according to claim 15 , wherein said first feedback signal defines a first weight determined on the basis of a channel estimate quantized to said first constellation, and said second feedback signal defines a second weight determined on the basis of a channel estimate quantized to said second constellation.
Claim 21
Dependent Claim
19 words
A method according to claim 18 , wherein said second constellation is a rotated copy of said first constellation.
Claim 22
Dependent Claim
24 words
A method according to claim 18 , wherein said second feedback signal is based on a rotated channel estimate quantized to said first constellation.
Claim 23
Dependent Claim
21 words
A method according to claim 15 , wherein said first and second feedback signals are fed back in successive time slots.
Claim 24
Dependent Claim
33 words
A method according to claim 15 , wherein said first feedback signal defines a real part of said weight information, and said second feedback signal defines an imaginary part of said weight information.
Claim 25
Dependent Claim
30 words
A method according to claim 22 , wherein said first feedback signal is fed back during odd time slots, and second feedback signal is fed back during even time slots.
Claim 26
Dependent Claim
51 words
A method according to claim 15 , wherein said first feedback signal defines a first feedback information to be used for updating a first beam of said transmitting element, and said second feedback signal defines a second feedback information to be used for updating a second beam of said transmitting element.
Claim 27
Dependent Claim
37 words
A method according to claim 15 , wherein said first feedback signal defines a quadrant in a 4-PSK constellation, and said second feedback signal defines a constellation point within said quadrant defined by said first feedback signal.
Claim 28
Dependent Claim
23 words
A method according to claim 25 , wherein said second feedback signal defines a differential change, a Gray-encoded sub-quadrant, or a combination thereof.
Claim 29
Dependent Claim
97 words
A transmit diversity method for a wireless communication system comprising a transmitting element and at least one receiver, said method comprising the steps of: a) transmitting from said transmitting element to said at least one receiver a transmission signal in accordance with a weight information determined in response to a feedback information; b) deriving said feedback information from the response at said at least one receiver to said transmission signal; and c) feeding back said feedback information using multiplexed feedback signals; wherein said multiplexed feedback signals are transmitted by at least two users having different signal constellations.
Claim 30
Dependent Claim
97 words
A transmit diversity method for a wireless communication system comprising a transmitting element and at least one receiver, said method comprising the steps of: a) transmitting from said transmitting element to said at least one receiver a transmission signal in accordance with a weight information determined in response to a feedback information; b) deriving said feedback information from the response at said at least one receiver to said transmission signal; and c) feeding back said feedback information using multiplexed feedback signals; wherein said multiplexed feedback signals are transmitted by at least two users having different signal constellations.
Claim 31
Dependent Claim
45 words
A method according to claim 27 , wherein said at least two users comprise a first set of users controlling weights at a first antenna of said transmitting element, and a second set of users controlling weights at a second antenna of said transmitting element.
Claim 32
Dependent Claim
122 words
A transmit diversity method for a wireless communication system comprising a transmitting element and at least one receiver, said method comprising the steps of: a) transmitting from said transmitting element to said at least one receiver a transmission signal in accordance with a weight information determined in response to a feedback information; b) deriving said feedback information from the response at said at least one receiver to said transmission signal; and c) feeding back said feedback information using multiplexed feedback signals: wherein at least one of said weight information and a direction of transmission are determined on the basis of a feedback signal filtering operation and said weight information is determined by quantizing the filtered feedback information to a desired quantization constellation.
Claim 33
Dependent Claim
122 words
A transmit diversity method for a wireless communication system comprising a transmitting element and at least one receiver, said method comprising the steps of: a) transmitting from said transmitting element to said at least one receiver a transmission signal in accordance with a weight information determined in response to a feedback information; b) deriving said feedback information from the response at said at least one receiver to said transmission signal; and c) feeding back said feedback information using multiplexed feedback signals: wherein at least one of said weight information and a direction of transmission are determined on the basis of a feedback signal filtering operation and said weight information is determined by quantizing the filtered feedback information to a desired quantization constellation.
Claim 34
Dependent Claim
20 words
A method according to claim 29 , wherein said desired constellation depends on an amplifier loading at said transmitting element.
Claim 35
Dependent Claim
26 words
A method according to claim 29 , wherein said filtered feedback information comprises four constellation points and said quantization constellation comprises eight or sixteen constellation points.
Claim 36
Dependent Claim
134 words
A transmit diversity method for a wireless communication system comprising a transmitting element and at least one receiver, said method comprising the steps of: a) transmitting from said transmitting element to said at least one receiver a transmission signal in accordance with a weight information determined in response to a feedback information; b) deriving said feedback information from the response at said at least one receiver to said transmission signal; and c) feeding back said feedback information using multiplexed feedback signals; wherein at least one of said weight information and a direction of transmission are determined on the basis of a feedback signal filtering operation and the feedback signal filtering operation is performed by a filter of a length of N samples, wherein N is larger than the number of said multiplexed feedback signals.
Claim 37
Dependent Claim
134 words
A transmit diversity method for a wireless communication system comprising a transmitting element and at least one receiver, said method comprising the steps of: a) transmitting from said transmitting element to said at least one receiver a transmission signal in accordance with a weight information determined in response to a feedback information; b) deriving said feedback information from the response at said at least one receiver to said transmission signal; and c) feeding back said feedback information using multiplexed feedback signals; wherein at least one of said weight information and a direction of transmission are determined on the basis of a feedback signal filtering operation and the feedback signal filtering operation is performed by a filter of a length of N samples, wherein N is larger than the number of said multiplexed feedback signals.
Claim 38
Dependent Claim
130 words
A transmit diversity method for a wireless communication system comprising a transmitting element and at least one receiver, said method comprising the steps of: a) transmitting from said transmitting element to said at least one receiver a transmission signal in accordance with a weight information determined in response to a feedback information; b) deriving said feedback information from the response at said at least one receiver to said transmission signal; and c) feeding back said feedback information using multiplexed feedback signals; wherein at least one of said weight information and a direction of transmission are determined on the basis of a feedback signal filtering operation and said filtering operation comprises a robust filtering, a FIR filtering, an IIR filtering, a linear filtering, a non-linear filtering, or a smoothing and prediction.
Claim 39
Dependent Claim
130 words
A transmit diversity method for a wireless communication system comprising a transmitting element and at least one receiver, said method comprising the steps of: a) transmitting from said transmitting element to said at least one receiver a transmission signal in accordance with a weight information determined in response to a feedback information; b) deriving said feedback information from the response at said at least one receiver to said transmission signal; and c) feeding back said feedback information using multiplexed feedback signals; wherein at least one of said weight information and a direction of transmission are determined on the basis of a feedback signal filtering operation and said filtering operation comprises a robust filtering, a FIR filtering, an IIR filtering, a linear filtering, a non-linear filtering, or a smoothing and prediction.
Claim 40
Dependent Claim
113 words
A transmit diversity method for a wireless communication system comprising a transmitting element and at least one receiver, said method comprising the steps of: a) transmitting from said transmitting element to said at least one receiver a transmission signal in accordance with a weight information determined in response to a feedback information; b) deriving said feedback information from the response at said at least one receiver to said transmission signal; and c) feeding back said feedback information using multiplexed feedback signals; wherein said feedback information is fed back to said transmitting element by determining said weight information by filtering said feedback information and quantizing the filtered feedback information to a desired quantization constellation.
Claim 41
Dependent Claim
113 words
A transmit diversity method for a wireless communication system comprising a transmitting element and at least one receiver, said method comprising the steps of: a) transmitting from said transmitting element to said at least one receiver a transmission signal in accordance with a weight information determined in response to a feedback information; b) deriving said feedback information from the response at said at least one receiver to said transmission signal; and c) feeding back said feedback information using multiplexed feedback signals; wherein said feedback information is fed back to said transmitting element by determining said weight information by filtering said feedback information and quantizing the filtered feedback information to a desired quantization constellation.
Claim 42
Dependent Claim
26 words
A method according to claim 34 , wherein the quantization constellation at said at least one receiver has fewer states than that at said transmitting element.
Claim 43
Dependent Claim
25 words
A method according to claim 35 , wherein said feedback information comprises four constellation points and said quantization constellation comprises eight or sixteen constellation points.
Claim 44
Dependent Claim
20 words
A method according to claim 34 , wherein the feedback signal filtering operation is performed by a moving average filter.
Claim 45
Dependent Claim
35 words
A method according to claim 34 , wherein the feedback signal filtering operation is applied to a sequence of previous feedback signals, and the weight information is calculated by an estimation using a trellis structure.
Claim 46
Dependent Claim
20 words
A method according to claim 38 , wherein said estimation is performed by using a sequence estimator or MAP detector.
Claim 47
Dependent Claim
97 words
A transmit diversity system for a wireless communication system, comprising: a) transmitting means for transmitting a transmission signal from a transmitting element in accordance with a weight information determined in response to a filtered feedback information, wherein said weight information is determined by quantizing said filtered feedback information to a desired quantization constellation; b) at least one receiver for receiving said transmission signal and deriving said filtered feedback information from the response to said transmission signal; c) wherein said at least one receiver comprises feedback means for feeding back said filtered feedback information using multiplexed feedback signals.
Claim 48
Dependent Claim
97 words
A transmit diversity system for a wireless communication system, comprising: a) transmitting means for transmitting a transmission signal from a transmitting element in accordance with a weight information determined in response to a filtered feedback information, wherein said weight information is determined by quantizing said filtered feedback information to a desired quantization constellation; b) at least one receiver for receiving said transmission signal and deriving said filtered feedback information from the response to said transmission signal; c) wherein said at least one receiver comprises feedback means for feeding back said filtered feedback information using multiplexed feedback signals.
Claim 49
Dependent Claim
102 words
A transmit diversity system for a wireless communication system, comprising: a) transmitting means for transmitting a transmission signal from a transmitting element in accordance with a weight information determined in response to a feedback information; b) at least one receiver for receiving said transmission signal and deriving said feedback information from the response to said transmission signal; c) wherein said at least one receiver comprises feedback means for feeding back said feedback information using multiplexed feedback signals; wherein said feedback means is arranged to generate a first feedback signal having a first constellation and a second feedback signal having a second constellation.
Claim 50
Dependent Claim
102 words
A transmit diversity system for a wireless communication system, comprising: a) transmitting means for transmitting a transmission signal from a transmitting element in accordance with a weight information determined in response to a feedback information; b) at least one receiver for receiving said transmission signal and deriving said feedback information from the response to said transmission signal; c) wherein said at least one receiver comprises feedback means for feeding back said feedback information using multiplexed feedback signals; wherein said feedback means is arranged to generate a first feedback signal having a first constellation and a second feedback signal having a second constellation.
Claim 51
Dependent Claim
143 words
A transmit diversity system for a wireless communication system, comprising: a) transmitting means for transmitting a transmission signal from a transmitting element in accordance with a weight information determined in response to a feedback information; b) at least one receiver for receiving said transmission signal and deriving said feedback information from the response to said transmission signal; c) wherein said at least one receiver comprises feedback means for feeding back said feedback information using multiplexed feedback signals; wherein said feedback means is arranged to generate a first feedback signal having a first constellation and a second feedback signal having a second constellation; wherein said first feedback signal defines a first phase weight determined on the basis of a channel estimate, and said second feedback signal defines a second phase weight determined on the basis of a rotated constellation of said first feedback signal.
Claim 52
Dependent Claim
143 words
A transmit diversity system for a wireless communication system, comprising: a) transmitting means for transmitting a transmission signal from a transmitting element in accordance with a weight information determined in response to a feedback information; b) at least one receiver for receiving said transmission signal and deriving said feedback information from the response to said transmission signal; c) wherein said at least one receiver comprises feedback means for feeding back said feedback information using multiplexed feedback signals; wherein said feedback means is arranged to generate a first feedback signal having a first constellation and a second feedback signal having a second constellation; wherein said first feedback signal defines a first phase weight determined on the basis of a channel estimate, and said second feedback signal defines a second phase weight determined on the basis of a rotated constellation of said first feedback signal.
Claim 53
Dependent Claim
128 words
A transmit diversity system for a wireless communication system, comprising: a) transmitting means for transmitting a transmission signal from a transmitting element in accordance with a weight information determined in response to a feedback information; b) at least one receiver for receiving said transmission signal and deriving said feedback information from the response to said transmission signal; c) wherein said at least one receiver comprises feedback means for feeding back said feedback information using multiplexed feedback signals; wherein said feedback means is arranged to generate a first feedback signal having a first constellation and a second feedback signal having a second constellation; wherein said first feedback signal defines a real part of said weight information, and said second feedback signal defines an imaginary part of said weight information.
Claim 54
Dependent Claim
128 words
A transmit diversity system for a wireless communication system, comprising: a) transmitting means for transmitting a transmission signal from a transmitting element in accordance with a weight information determined in response to a feedback information; b) at least one receiver for receiving said transmission signal and deriving said feedback information from the response to said transmission signal; c) wherein said at least one receiver comprises feedback means for feeding back said feedback information using multiplexed feedback signals; wherein said feedback means is arranged to generate a first feedback signal having a first constellation and a second feedback signal having a second constellation; wherein said first feedback signal defines a real part of said weight information, and said second feedback signal defines an imaginary part of said weight information.
Claim 55
Dependent Claim
32 words
A system according to claim 43 , wherein said feedback means is arranged to feedback said first feedback signal during odd time slots and said second feedback signal during even time slots.
Claim 56
Dependent Claim
154 words
A transmit diversity system for a wireless communication system, comprising: a) transmitting means for transmitting a transmission signal from a transmitting element in accordance with a weight information determined in response to a feedback information; b) at least one receiver for receiving said transmission signal and deriving said feedback information from the response to said transmission signal; c) wherein said at least one receiver comprises feedback means for feeding back said feedback information using multiplexed feedback signals; wherein said feedback means is arranged to generate a first feedback signal having a first constellation and a second feedback signal having a second constellation; wherein said first feedback signal defines a first feedback information to be used by said transmitting means for updating a first beam of said transmitting element, and said second feedback signal defines a second feedback information to be used by said transmitting means for updating a second beam of said transmitting element.
Claim 57
Dependent Claim
154 words
A transmit diversity system for a wireless communication system, comprising: a) transmitting means for transmitting a transmission signal from a transmitting element in accordance with a weight information determined in response to a feedback information; b) at least one receiver for receiving said transmission signal and deriving said feedback information from the response to said transmission signal; c) wherein said at least one receiver comprises feedback means for feeding back said feedback information using multiplexed feedback signals; wherein said feedback means is arranged to generate a first feedback signal having a first constellation and a second feedback signal having a second constellation; wherein said first feedback signal defines a first feedback information to be used by said transmitting means for updating a first beam of said transmitting element, and said second feedback signal defines a second feedback information to be used by said transmitting means for updating a second beam of said transmitting element.
Claim 58
Dependent Claim
99 words
A transmitter for a wireless communication system, comprising: a) extracting means for extracting a feedback information from a received signal; b) transmitting means for transmitting a transmission signal from a transmitting element in accordance with a weight information; c) determining means for determining said weight information in response to said extracted feedback information, wherein said weight information is determined by quantizing said extracted feedback information to a desired quantization constellation; and d) control means for controlling said determining means so as to determine said weight information in accordance with multiplexed feedback signals used for feeding back said feedback information.
Claim 59
Dependent Claim
99 words
A transmitter for a wireless communication system, comprising: a) extracting means for extracting a feedback information from a received signal; b) transmitting means for transmitting a transmission signal from a transmitting element in accordance with a weight information; c) determining means for determining said weight information in response to said extracted feedback information, wherein said weight information is determined by quantizing said extracted feedback information to a desired quantization constellation; and d) control means for controlling said determining means so as to determine said weight information in accordance with multiplexed feedback signals used for feeding back said feedback information.
Claim 60
Dependent Claim
15 words
A transmitter according to claim 46 , wherein said transmitting element is an antenna array.
Claim 61
Dependent Claim
20 words
A transmitter according to claim 46 , wherein said control means is arranged to perform a feedback signal filtering operation.
Claim 62
Dependent Claim
114 words
A transmitter for a wireless communication system, comprising: a) extracting means for extracting a feedback information from a received signal; b) transmitting means for transmitting a transmission signal from a transmitting element in accordance with a weight information; c) determining means for determining said weight information in response to said extracted feedback information; and d) control means for controlling said determining means so as to determine said weight information in accordance with multiplexed feedback signals used for feeding back said feedback information; wherein said control means comprises a switching means for alternately switching a first feedback signal having a first constellation and a second feedback signal having a second constellation to said determining means.
Claim 63
Dependent Claim
114 words
A transmitter for a wireless communication system, comprising: a) extracting means for extracting a feedback information from a received signal; b) transmitting means for transmitting a transmission signal from a transmitting element in accordance with a weight information; c) determining means for determining said weight information in response to said extracted feedback information; and d) control means for controlling said determining means so as to determine said weight information in accordance with multiplexed feedback signals used for feeding back said feedback information; wherein said control means comprises a switching means for alternately switching a first feedback signal having a first constellation and a second feedback signal having a second constellation to said determining means.
Claim 64
Dependent Claim
25 words
A transmitter according to claim 49 , wherein said determining means is arranged to derive said weight information from said first and second feedback signals.
Claim 65
Dependent Claim
75 words
A transmitter according to claim 49 , wherein said control means is arranged to control said transmitting means is arranged to control said transmitting means so as to alternately update a first beam of said transmitting element by using a first weight information determined on the basis of said first feedback signal, and a second beam of said transmitting element by using a second weight information determined on the basis of said second feedback signal.
Claim 66
Dependent Claim
107 words
A transmitter for a wireless communication system, comprising: a) extracting means for extracting a feedback information from a received signal; b) transmitting means for transmitting a transmission signal from a transmitting element in accordance with a weight information; c) determining means for determining said weight information in response to said extracted feedback information; and d) control means for controlling said determining means so as to determine said weight information in accordance with multiplexed feedback signals used for feeding back said feedback information; wherein said control means is arranged to perform a feedback signal filtering operation and to quantize the filtered feedback information to a desired quantization constellation.
Claim 67
Dependent Claim
107 words
A transmitter for a wireless communication system, comprising: a) extracting means for extracting a feedback information from a received signal; b) transmitting means for transmitting a transmission signal from a transmitting element in accordance with a weight information; c) determining means for determining said weight information in response to said extracted feedback information; and d) control means for controlling said determining means so as to determine said weight information in accordance with multiplexed feedback signals used for feeding back said feedback information; wherein said control means is arranged to perform a feedback signal filtering operation and to quantize the filtered feedback information to a desired quantization constellation.
Claim 68
Dependent Claim
108 words
A transmitter for a wireless communication system, comprising: a) extracting means for extracting a feedback information from a received signal; b) transmitting means for transmitting a transmission signal from a transmitting element in accordance with a weight information; c) determining means for determining said weight information in response to said extracted feedback information; and d) control means for controlling said determining means so as to determine said weight information in accordance with multiplexed feedback signals used for feeding back said feedback information; wherein said control means is arranged to perform a feedback signal filtering operation and comprises a moving average filter for performing the feedback signal filtering operation.
Claim 69
Dependent Claim
108 words
A transmitter for a wireless communication system, comprising: a) extracting means for extracting a feedback information from a received signal; b) transmitting means for transmitting a transmission signal from a transmitting element in accordance with a weight information; c) determining means for determining said weight information in response to said extracted feedback information; and d) control means for controlling said determining means so as to determine said weight information in accordance with multiplexed feedback signals used for feeding back said feedback information; wherein said control means is arranged to perform a feedback signal filtering operation and comprises a moving average filter for performing the feedback signal filtering operation.
Claim 70
Dependent Claim
120 words
A transmitter for a wireless communication system, comprising: a) extracting means for extracting a feedback information from a received signal; b) transmitting means for transmitting a transmission signal from a transmitting element in accordance with a weight information; c) determining means for determining said weight information in response to said extracted feedback information; and d) control means for controlling said determining means so as to determine said weight information in accordance with multiplexed feedback signals used for feeding back said feedback information; wherein said control means is arranged to perform a feedback signal filtering operation and said filtering operation comprises a robust filtering, a FIR filtering, an IIR filtering, a linear filtering, a non-linear filtering, or a smoothing and prediction.
Claim 71
Dependent Claim
120 words
A transmitter for a wireless communication system, comprising: a) extracting means for extracting a feedback information from a received signal; b) transmitting means for transmitting a transmission signal from a transmitting element in accordance with a weight information; c) determining means for determining said weight information in response to said extracted feedback information; and d) control means for controlling said determining means so as to determine said weight information in accordance with multiplexed feedback signals used for feeding back said feedback information; wherein said control means is arranged to perform a feedback signal filtering operation and said filtering operation comprises a robust filtering, a FIR filtering, an IIR filtering, a linear filtering, a non-linear filtering, or a smoothing and prediction.
Claim 72
Dependent Claim
105 words
A transmitter for a wireless communication system, comprising: a) extracting means for extracting a feedback information from a received signal; b) transmitting means for transmitting a transmission signal from a transmitting element in accordance with a weight information; c) determining means for determining said weight information in response to said extracted feedback information; and d) control means for controlling said determining means so as to determine said weight information in accordance with multiplexed feedback signals used for feeding back said feedback information; wherein control means are configured for filtering said extracted feedback information, and for quantizing the filtered feedback information to a desired quantization constellation.
Claim 73
Dependent Claim
105 words
A transmitter for a wireless communication system, comprising: a) extracting means for extracting a feedback information from a received signal; b) transmitting means for transmitting a transmission signal from a transmitting element in accordance with a weight information; c) determining means for determining said weight information in response to said extracted feedback information; and d) control means for controlling said determining means so as to determine said weight information in accordance with multiplexed feedback signals used for feeding back said feedback information; wherein control means are configured for filtering said extracted feedback information, and for quantizing the filtered feedback information to a desired quantization constellation.
Claim 74
Dependent Claim
23 words
A transmitter according to claim 55 , wherein said control means comprises a moving average filter for performing the feedback signal filtering operation.
Claim 75
Dependent Claim
94 words
A receiver for a wireless communication system, comprising: a) receiving means for receiving a transmission signal; b) deriving means for deriving a feedback information from the response to said transmission signal; and c) feedback means for feeding back said feedback information using multiplexed feedback signals, wherein said deriving means comprises extracting means for extracting a probing signal transmitted with a known power, channel estimation means for performing a channel estimation on the basis of said extracted probing, signal, and generating means for generating said multiplexed feedback signals on the basis of said channel estimation.
Claim 76
Dependent Claim
94 words
A receiver for a wireless communication system, comprising: a) receiving means for receiving a transmission signal; b) deriving means for deriving a feedback information from the response to said transmission signal; and c) feedback means for feeding back said feedback information using multiplexed feedback signals, wherein said deriving means comprises extracting means for extracting a probing signal transmitted with a known power, channel estimation means for performing a channel estimation on the basis of said extracted probing, signal, and generating means for generating said multiplexed feedback signals on the basis of said channel estimation.
Claim 77
Dependent Claim
138 words
A receiver for a wireless communication system, comprising: a) receiving means for receiving a transmission signal; b) deriving means for deriving a feedback information from the response to said transmission signal; and c) feedback means for feeding back said feedback information using multiplexed feedback signals, wherein said deriving means comprises extracting means for extracting a probing signal transmitted with a known power, channel estimation means for performing a channel estimation on the basis of said extracted probing, signal, and generating means for generating said multiplexed feedback signals on the basis of said channel estimation, wherein said generating means is arranged to generate a first feedback signal having a first constellation and a second feedback signal having a second constellation, wherein said feedback means is arranged to feedback said first and second feedback signals as said multiplexed feedback signals.
Claim 78
Dependent Claim
138 words
A receiver for a wireless communication system, comprising: a) receiving means for receiving a transmission signal; b) deriving means for deriving a feedback information from the response to said transmission signal; and c) feedback means for feeding back said feedback information using multiplexed feedback signals, wherein said deriving means comprises extracting means for extracting a probing signal transmitted with a known power, channel estimation means for performing a channel estimation on the basis of said extracted probing, signal, and generating means for generating said multiplexed feedback signals on the basis of said channel estimation, wherein said generating means is arranged to generate a first feedback signal having a first constellation and a second feedback signal having a second constellation, wherein said feedback means is arranged to feedback said first and second feedback signals as said multiplexed feedback signals.
Claim 79
Dependent Claim
46 words
A receiver according to claim 58 , wherein said feedback means is arranged to alternately feedback said first and second feedback signals, wherein a quantization of the feedback information is based on the latest channel estimate and an available one of said first and second constellation.
Claim 80
Dependent Claim
41 words
A receiver according to claim 58 , wherein said generating means is arranged to generate said first feedback signal based on said channel estimation and said second feedback signal based on a rotation of said channel estimation by a predetermined angle.
Claim 81
Dependent Claim
42 words
A receiver according to claim 58 , wherein said generating means is arranged to generate said first feedback signal based on a real part of said feedback information, and said second feedback signal based on an imaginary part of said feedback information.
Claim 82
Dependent Claim
69 words
A receiver according to claim 58 , wherein said extracting means is arranged to alternately extract a probing signal corresponding to a first beam and a probing signal corresponding to a second beam, and said generating means is arranged to alternately generate said first feedback signal based on a channel estimate for said first beam, and said second feedback signal based on a channel estimate for said second beam.
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