US5305353A
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Method and apparatus for providing time diversity
Assignee: Nokia Bell Labs
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Filing: 1992-05-29
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Granted: 1994-04-19
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Expires: 2012-05-29
Abstract
Abstract The invention provides a method and apparatus for transmitting digital signal information to a receiver using a plurality of antennas. The invention involves applying a channel code to a digital signal producing one or more symbols. A plurality of symbol copies is made and each copy is weighted by a distinct time varying function. Each antenna transmits a signal based on one of the weighted symbol copies. Any channel code may be used with the invention, such as a convolutional channel code or block channel code. Weighting provided to symbol copies may involve application of an amplitude gain, phase shift, or both. The present invention may be used in combination with either or both conventional interleavers and constellation mappers.
Inventors
- 👤 Vijitha Weerackody
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 14:39
CPC Classifications
H; H04; H04B; H04B7/00; H04B7/02; H04B7/04; H04B7/06; H04B7/0613; H04L; H04L1/00; H04L1/02; H04L1/06
Claims Analysis
Total Claims: 38
Claim 1
Independent Claim
89 words
A method of transmitting digital signal information to a receiver with use of a plurality of M antennas, the method comprising the steps of: applying a channel code to a digital signal to produce one or more symbols; forming M copies of a symbol; weighting each of the M copies of the symbol with a distinct time varying function to form M weighted symbol copies; and substantially simultaneously transmitting M signals with M different antennas, each transmitted signal based on a distinct one of the M weighted symbol copies.
Claim 2
Independent Claim
89 words
A method of transmitting digital signal information to a receiver with use of a plurality of M antennas, the method comprising the steps of: applying a channel code to a digital signal to produce one or more symbols; forming M copies of a symbol; weighting each of the M copies of the symbol with a distinct time varying function to form M weighted symbol copies; and substantially simultaneously transmitting M signals with M different antennas, each transmitted signal based on a distinct one of the M weighted symbol copies.
Claim 3
Dependent Claim
21 words
The method of claim 1 wherein the step of applying a channel code comprises the step of applying a convolutional code.
Claim 4
Dependent Claim
21 words
The method of claim 1 wherein the step of applying a channel code comprises the step of applying a block code.
Claim 5
Dependent Claim
17 words
The method of claim 1 wherein each time varying function provides an amplitude gain to a symbol.
Claim 6
Dependent Claim
11 words
The method of claim 4 wherein the amplitude gain is ##EQU9##
Claim 7
Dependent Claim
17 words
The method of claim 1 wherein each time varying function provides a phase shift to a symbol.
Claim 8
Dependent Claim
20 words
The method of claim 6 wherein a phase shift applied to symbols is based upon a transmitted symbol data rate.
Claim 9
Dependent Claim
43 words
The method of claim 6 wherein a phase shift applied to an nth symbol for the mth antenna is ##EQU10## wherein f.sub.Δ is a fraction of a transmitted symbol data rate and T d is a reciprocal of the transmitted symbol data rate.
Claim 10
Dependent Claim
37 words
The method of claim 6 wherein a phase shift, θ m (l), applied to an nth symbol for the mth antenna is ##EQU11## where k and n' are integers which satisfy the following expressions: (k-1)M+1≦N≦kM and n'(k-1)<(l-M-n+1)≦(n'+1)(k-1).
Claim 11
Dependent Claim
18 words
The method of claim 1 furthering comprising the step of processing a plurality of symbols with an interleaver.
Claim 12
Dependent Claim
17 words
The method of claim 1 furthering comprising the step of processing a symbol with a constellation mapper.
Claim 13
Dependent Claim
14 words
The method of claim 11 wherein the constellation mapper comprises a DPSK constellation mapper.
Claim 14
Dependent Claim
14 words
The method of claim 11 wherein the constellation mapper comprises a PSK constellation mapper.
Claim 15
Dependent Claim
85 words
A transmitter for a wireless communication system for transmitting signals to a receiver, the transmitter comprising: a channel coder for receiving a digital information signal and producing one or more symbols based on said digital information signal; a plurality of M information symbol weighting means, coupled to the channel coder, each such means for weighting a symbol with a distinct time varying function; a plurality of M antennas, each coupled to a symbol weighting means, for transmitting substantially simultaneously M signals based on weighted symbols.
Claim 16
Dependent Claim
85 words
A transmitter for a wireless communication system for transmitting signals to a receiver, the transmitter comprising: a channel coder for receiving a digital information signal and producing one or more symbols based on said digital information signal; a plurality of M information symbol weighting means, coupled to the channel coder, each such means for weighting a symbol with a distinct time varying function; a plurality of M antennas, each coupled to a symbol weighting means, for transmitting substantially simultaneously M signals based on weighted symbols.
Claim 17
Dependent Claim
26 words
The transmitter of claim 14 wherein the signals for transmission to a receiver are provided to the transmitter by an information source comprising a telephone network.
Claim 18
Dependent Claim
14 words
The transmitter of claim 14 wherein the channel coder comprises a convolutional channel coder.
Claim 19
Dependent Claim
15 words
The transmitter of claim 14 wherein the channel coder comprises a block code channel coder.
Claim 20
Dependent Claim
25 words
The transmitter of claim 14 wherein one or more of the M information symbol weighting means comprise a multiplier applying the distinct time varying function.
Claim 21
Dependent Claim
17 words
The transmitter of claim 14 wherein the time varying function provides a phase shift to a symbol.
Claim 22
Dependent Claim
18 words
The transmitter of claim 14 wherein the distinct time varying function provides an amplitude gain to a symbol.
Claim 23
Dependent Claim
25 words
The transmitter of claim 14 further comprising a constellation mapper, coupled to receive symbols and to provide mapped symbols to the plurality of weighting means.
Claim 24
Dependent Claim
14 words
The transmitter of claim 21 wherein the constellation mapper comprises a PSK constellation mapper.
Claim 25
Dependent Claim
14 words
The transmitter of claim 21 wherein the constellation mapper comprises a DPSK constellation mapper.
Claim 26
Dependent Claim
21 words
The transmitter of claim 14 further comprising an interleaver, coupled to the channel coder, for producing a plurality of interleaved symbols.
Claim 27
Independent Claim
113 words
A method of transmitting digital signal information to a receiver with use of a plurality of antennas, the method comprising the steps of: applying a channel code to a digital signal to produce one or more symbols; forming one or more copies of a symbol; phase-shifting one or more copies of the symbol based on a distinct time varying function to form one or more phase-shifted symbol copes; and substantially simultaneously transmitting a plurality of signals each with a different antenna, one or more transmitted signal reflecting a phase-shifted symbol copy and zero or more transmitted signals reflecting copies of a symbol which are not phase-shifted based on a distinct time varying function.
Claim 28
Independent Claim
113 words
A method of transmitting digital signal information to a receiver with use of a plurality of antennas, the method comprising the steps of: applying a channel code to a digital signal to produce one or more symbols; forming one or more copies of a symbol; phase-shifting one or more copies of the symbol based on a distinct time varying function to form one or more phase-shifted symbol copes; and substantially simultaneously transmitting a plurality of signals each with a different antenna, one or more transmitted signal reflecting a phase-shifted symbol copy and zero or more transmitted signals reflecting copies of a symbol which are not phase-shifted based on a distinct time varying function.
Claim 29
Dependent Claim
21 words
The method of claim 25 wherein the step of applying a channel code comprises the step of applying a convolutional code.
Claim 30
Dependent Claim
21 words
The method of claim 25 wherein the step of applying a channel code comprises the step of applying a block code.
Claim 31
Dependent Claim
109 words
A transmitter for a wireless communication system for transmitting signals to a receiver, the transmitter comprising: a channel coder for receiving a digital information signal and producing one or more symbols based on said digital information signal; a plurality of information symbol phase-shifting means, coupled to the channel coder, each such means for phase-shifting a symbol in accordance with a distinct time varying function; and a plurality of antennas for substantially simultaneously transmitting a plurality of signals, one or more transmitted signals reflecting a phase-shifted symbol copy and zero or more transmitted signals reflecting copies of a symbol which are not phase-shifted based on a distinct time varying function.
Claim 32
Dependent Claim
109 words
A transmitter for a wireless communication system for transmitting signals to a receiver, the transmitter comprising: a channel coder for receiving a digital information signal and producing one or more symbols based on said digital information signal; a plurality of information symbol phase-shifting means, coupled to the channel coder, each such means for phase-shifting a symbol in accordance with a distinct time varying function; and a plurality of antennas for substantially simultaneously transmitting a plurality of signals, one or more transmitted signals reflecting a phase-shifted symbol copy and zero or more transmitted signals reflecting copies of a symbol which are not phase-shifted based on a distinct time varying function.
Claim 33
Dependent Claim
26 words
The transmitter of claim 28 wherein the signals for transmission to a receiver are provided to the transmitter by an information source comprising a telephone network.
Claim 34
Dependent Claim
14 words
The transmitter of claim 28 wherein the channel coder comprises a convolutional channel coder.
Claim 35
Dependent Claim
15 words
The transmitter of claim 28 wherein the channel coder comprises a block code channel coder.
Claim 36
Dependent Claim
22 words
The transmitter of claim 28 wherein one or more of the symbol phase-shifting means comprise a multiplier applying the time varying function.
Claim 37
Dependent Claim
25 words
The transmitter of claim 28 further comprising a constellation mapper, coupled to receive symbols and to provide mapped symbols to the plurality of phase-shifting means.
Claim 38
Dependent Claim
21 words
The transmitter of claim 28 further comprising an interleaver, coupled to the channel coder, for producing a plurality of interleaved symbols.
References Cited (Backward Citations)
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| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1997-04-18 | 1997-10-18 | 1998-04-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-04-18 | 2001-10-18 | 2002-04-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-04-18 | 2005-10-18 | 2006-04-19 | $7700.00 | Window Closed / Lapsed |