Patent US5278871A successfully refreshed from Google Patents.
US5278871A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for estimating signal weighting parameters in a receiver
Assignee: Motorola Mobility LLC
•
Filing: 1992-03-19
•
Granted: 1994-01-11
•
Expires: 2012-03-19
Abstract
Abstract A receiver (100) has improved signal weighting parameter estimation. The receiver receives a signal (101) having encoded data. A decision circuit (106) is coupled to the received encoded data to generate a first signal weighting parameter which is used to modify the received encoded data. The modified data is then decoded to output the decoded data. The decoded data output is then re-encoded using a technique similar to that used by the transmitter. The re-encoded data is then used to calculate a second signal weighting parameter which, in turn, is used to modify a stored replica of signal (101). The modified version of the stored replica is then decoded to yield a more accurate estimate of the information contained within the signal (101) at a receiver (100).
Inventors
- 👤 Phillip D. Rasky
- 👤 Gregory M. Chiasson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 20:03
CPC Classifications
H; H03; H03M; H03M13/00; H04; H04L; H04L1/00; H04L1/20; H04L25/00; H04L25/02; H04L25/0202; H04L25/0224; H04L25/0228; H04L25/023; H04L25/0236
Claims Analysis
Total Claims: 42
Claim 1
Independent Claim
107 words
In a communication system having a transmitter and a receiver, the transmitter transmitting a signal having undergone encoding at the transmitter, the signal having data contained within the signal, a method of estimating signal weighting parameters in the receiver, the method comprising the steps of: receiving the encoded signal; generating a first signal weighting parameter related to the received encoded signal; modifying the received encoded signal with said first generated signal weighting parameter; decoding the modified received encoded signal to produce a first decoded signal; re-encoding the first decoded signal to produce a re-encoded signal; and generating a second signal weighting parameter related to said re-encoded signal.
Claim 2
Dependent Claim
107 words
In a communication system having a transmitter and a receiver, the transmitter transmitting a signal having undergone encoding at the transmitter, the signal having data contained within the signal, a method of estimating signal weighting parameters in the receiver, the method comprising the steps of: receiving the encoded signal; generating a first signal weighting parameter related to the received encoded signal; modifying the received encoded signal with said first generated signal weighting parameter; decoding the modified received encoded signal to produce a first decoded signal; re-encoding the first decoded signal to produce a re-encoded signal; and generating a second signal weighting parameter related to said re-encoded signal.
Claim 3
Dependent Claim
43 words
The method of claim 1 further comprising the steps of: modifying a stored replica of the received encoded signal with said second generated signal weighting parameter; and decoding the modified stored replica of the received encoded signal to produce a second decoded signal.
Claim 4
Dependent Claim
20 words
The method of claim 2 wherein said second decoded signal is utilized to reconstruct the transmitted signal in the receiver.
Claim 5
Dependent Claim
147 words
In a communication system having a transmitter and a receiver, the transmitter transmitting a signal having undergone encoding at the transmitter, a method of estimating signal weighting parameters in a receiver, the method comprising the steps of: receiving the encoded signal; transforming said received encoded signal into a received encoded vector representing the encoded signal; generating a first signal parameter related to the received encoded vector; modifying said received encoded vector with said first signal weighting parameter; decoding said modified received encoded vector to produce a first decoded received vector; re-encoding said first decoded received vector to produce a re-encoded received vector; generating a second signal weighting parameter related to the re-encoded received vector; modifying a stored replica of said received encoded vector with said second signal weighting parameter; and decoding said modified stored replica of said received encoded vector to produce a second decoded received vector.
Claim 6
Dependent Claim
147 words
In a communication system having a transmitter and a receiver, the transmitter transmitting a signal having undergone encoding at the transmitter, a method of estimating signal weighting parameters in a receiver, the method comprising the steps of: receiving the encoded signal; transforming said received encoded signal into a received encoded vector representing the encoded signal; generating a first signal parameter related to the received encoded vector; modifying said received encoded vector with said first signal weighting parameter; decoding said modified received encoded vector to produce a first decoded received vector; re-encoding said first decoded received vector to produce a re-encoded received vector; generating a second signal weighting parameter related to the re-encoded received vector; modifying a stored replica of said received encoded vector with said second signal weighting parameter; and decoding said modified stored replica of said received encoded vector to produce a second decoded received vector.
Claim 7
Dependent Claim
20 words
The method of claim 4 wherein said first and second signal weighting parameters each further comprises a soft-decision weighting parameter.
Claim 8
Dependent Claim
12 words
The method of claim 4 wherein encoding comprises forward error correction encoding.
Claim 9
Dependent Claim
23 words
The method of claim 4 wherein each step of decoding further comprises the step of one of either hard-decision decoding or soft-decision decoding.
Claim 10
Dependent Claim
17 words
The method of claim 4 wherein each step of decoding is performed by a Viterbi decoding algorithm.
Claim 11
Dependent Claim
25 words
The method of claim 4 wherein said step of decoding said received encoded vector further comprises a step of closest constellation point (CCP) soft-decision decoding.
Claim 12
Dependent Claim
21 words
The method of claim 4 wherein said step of re-encoding is a coding technique similar to that used by the transmitter.
Claim 13
Dependent Claim
20 words
The method of claim 4 wherein said second decoded received vector has fewer errors than said first decoded received vector.
Claim 14
Dependent Claim
22 words
The method of claim 11 wherein said second decoded received vector is further utilized to reconstruct the transmitted signal at the receiver.
Claim 15
Dependent Claim
54 words
The method of claim 4 wherein said steps of re-encoding, modifying a stored replica of said received encoded vector and decoding said modified stored replica of said received encoded vector to produce a second decoded received vector may be iterated to produce a decoded signal containing additional information about data contained within the signal.
Claim 16
Independent Claim
164 words
A method of signal estimation in a receiver, the receiver having received a signal from a transmitter, the receiver weighting the signal by calculating soft-decision weighting parameters in response to the received signal, the method comprising the steps of: transforming the received signal into a received vector representing the received signal; calculating a first error signal between said received transformed vector and a predetermined vector which represents an ideally transmitted signal; modifying said received transformed vector with a first soft-decision weighting parameter generated based on said first error signal; decoding said modified received vector to produce a first decoded received vector; re-encoding said first decoded received vector to produce a first re-encoded received vector; calculating a second error signal between said re-encoded received vector and said received signal; modifying the received signal with a second soft-decision weighting parameter generated based on said second error signal to produce a modified received signal; and decoding said modified received signal to produce a second decoded received vector.
Claim 17
Independent Claim
164 words
A method of signal estimation in a receiver, the receiver having received a signal from a transmitter, the receiver weighting the signal by calculating soft-decision weighting parameters in response to the received signal, the method comprising the steps of: transforming the received signal into a received vector representing the received signal; calculating a first error signal between said received transformed vector and a predetermined vector which represents an ideally transmitted signal; modifying said received transformed vector with a first soft-decision weighting parameter generated based on said first error signal; decoding said modified received vector to produce a first decoded received vector; re-encoding said first decoded received vector to produce a first re-encoded received vector; calculating a second error signal between said re-encoded received vector and said received signal; modifying the received signal with a second soft-decision weighting parameter generated based on said second error signal to produce a modified received signal; and decoding said modified received signal to produce a second decoded received vector.
Claim 18
Dependent Claim
38 words
The method of claim 14 wherein said step of modifying the received signal with a second soft-decision weighting parameter further comprises the step of modifying a stored replica of the received signal with a second soft-decision weighting parameter.
Claim 19
Dependent Claim
59 words
The method of claim 14 wherein said step of calculating said first error signal further comprises the steps of calculating: a variance of said received vector; a variance of said first error signal; and a channel gain and a noise variance based on said calculated variance of said received vector and said calculated variance of said first error signal.
Claim 20
Dependent Claim
30 words
The method of claim 16 wherein said steps of calculating are performed over a number of bits for which said channel gain and said noise variance do not vary appreciably.
Claim 21
Dependent Claim
29 words
The method of claim 16 wherein at least one of said calculated channel gain or said calculated noise variance is used to weight the received signal in the receiver.
Claim 22
Dependent Claim
146 words
In a communication system having a transmitter and a receiver, the transmitter transmitting a signal having data contained therein, the receiver having a limited amount of information about the data, a method of estimating signal weighting parameters in the receiver, the method comprising the steps of: receiving the signal; generating a first signal weighting parameter related to the received signal; modifying the received signal with said first generated signal weighting parameter related to the received signal; decoding the modified received signal to produce a first decoded signal; re-encoding the first decoded signal; generating a second signal weighting parameter related to the signal utilizing said re-encoded signal; modifying the received signal with said second generated signal weighting parameter; and re-decoding the modified received signal modified with said second generated signal weighting parameter to produce a second decoded signal having additional information about data contained within the signal.
Claim 23
Dependent Claim
146 words
In a communication system having a transmitter and a receiver, the transmitter transmitting a signal having data contained therein, the receiver having a limited amount of information about the data, a method of estimating signal weighting parameters in the receiver, the method comprising the steps of: receiving the signal; generating a first signal weighting parameter related to the received signal; modifying the received signal with said first generated signal weighting parameter related to the received signal; decoding the modified received signal to produce a first decoded signal; re-encoding the first decoded signal; generating a second signal weighting parameter related to the signal utilizing said re-encoded signal; modifying the received signal with said second generated signal weighting parameter; and re-decoding the modified received signal modified with said second generated signal weighting parameter to produce a second decoded signal having additional information about data contained within the signal.
Claim 24
Dependent Claim
40 words
The method of claim 19 wherein said step of modifying the received signal with a second generated signal weighting parameter further comprises the step of modifying a stored replica of the received signal with a second generated signal weighting parameter.
Claim 25
Dependent Claim
20 words
The method of claim 19 wherein said second decoded signal is utilized to reconstruct the transmitted signal in the receiver.
Claim 26
Dependent Claim
46 words
The method of claim 19 wherein said steps of re-encoding, generating a second signal weighting parameter, modifying the received signal with said second generated signal weighting parameter, and re-decoding may be iterated to produce a decoded signal containing additional information about data contained within the signal.
Claim 27
Dependent Claim
22 words
The method of claim 19 wherein said limited amount of information further comprises a fully-known amount of information contained within the signal.
Claim 28
Dependent Claim
22 words
The method of claim 19 wherein said limited amount of information further comprises a partially-known amount of information contained within the signal.
Claim 29
Dependent Claim
35 words
The method of claim 19 wherein said second signal weighting parameter may be generated from a combination of a fully-known amount of data or a partially-known amount of data and a remainder of unknown bits.
Claim 30
Independent Claim
103 words
An apparatus for estimating signal weighting parameters in a receiver, the apparatus comprising: means for receiving an encoded signal transmitted from a transmitter; first means, coupled to said means for receiving, for making signal weighting parameter decisions based on said received encoded signal; means, coupled to said means for making decisions, for decoding said received signal based on said signal weighting parameter decisions; means, coupled to said means for decoding, for re-encoding said decoded received signal; and second means, coupled to said means for re-encoding and said received encoded signal, for making signal weighting parameter decisions based on said re-encoded received encoded signal.
Claim 31
Independent Claim
103 words
An apparatus for estimating signal weighting parameters in a receiver, the apparatus comprising: means for receiving an encoded signal transmitted from a transmitter; first means, coupled to said means for receiving, for making signal weighting parameter decisions based on said received encoded signal; means, coupled to said means for making decisions, for decoding said received signal based on said signal weighting parameter decisions; means, coupled to said means for decoding, for re-encoding said decoded received signal; and second means, coupled to said means for re-encoding and said received encoded signal, for making signal weighting parameter decisions based on said re-encoded received encoded signal.
Claim 32
Dependent Claim
28 words
The apparatus of claim 26 wherein said first means for making signal weighting parameter decisions further comprises means for making one of either a hard-decision or a soft-decision.
Claim 33
Dependent Claim
15 words
The apparatus of claim 26 wherein said means for decoding further comprises a Viterbi decoder.
Claim 34
Dependent Claim
50 words
The apparatus of claim 26 wherein said second means for making signal weighting parameter decisions based on said re-encoded received encoded signal further comprises means for weighting said received encoded signal with said signal weighting parameter decisions to produce a signal utilized to reconstruct the transmitted signal in the receiver.
Claim 35
Dependent Claim
112 words
A receiver for estimating signal weighting parameters, the receiver employed in a slow-frequency hopping (SFH) communication system, the receiver comprising: means for receiving a frequency-hopped signal transmitted from a transmitter; first means, coupled to said means for receiving, for making signal weighting parameter decisions based on said received frequency-hopped signal; means, coupled to said means for making decisions, for decoding said received frequency-hopped signal based on said signal weighting parameter decisions, means, coupled to said means for decoding, for re-encoding said decoded received frequency-hopped signal; and second means, coupled to said means for re-encoding and said received frequency-hopped signal, for making signal weighting parameter decisions based on said re-encoded received frequency-hopped signal.
Claim 36
Dependent Claim
112 words
A receiver for estimating signal weighting parameters, the receiver employed in a slow-frequency hopping (SFH) communication system, the receiver comprising: means for receiving a frequency-hopped signal transmitted from a transmitter; first means, coupled to said means for receiving, for making signal weighting parameter decisions based on said received frequency-hopped signal; means, coupled to said means for making decisions, for decoding said received frequency-hopped signal based on said signal weighting parameter decisions, means, coupled to said means for decoding, for re-encoding said decoded received frequency-hopped signal; and second means, coupled to said means for re-encoding and said received frequency-hopped signal, for making signal weighting parameter decisions based on said re-encoded received frequency-hopped signal.
Claim 37
Dependent Claim
18 words
The receiver of claim 30 wherein said receiver is employed in a code-division multiple access (CDMA) communication system.
Claim 38
Dependent Claim
118 words
A receiver for estimating signal weighting parameters, the receiver employed in a time-division multiple access (TDMA) communication system, the receiver comprising: means for receiving an encoded signal, transmitted from a transmitter, during a first TDMA timeslot; first means, coupled to said means for receiving, for making signal weighting parameter decisions based on said received encoded signal; means, coupled to said means for making decisions, for decoding said received encoded signal based on said signal weighting parameter decisions; means, coupled to said means for decoding, for re-encoding said decoded received encoded signal; and second means, coupled to said means for re-encoding and said received encoded signal, for making signal weighting parameter decisions based on said re-encoded received encoded signal.
Claim 39
Dependent Claim
118 words
A receiver for estimating signal weighting parameters, the receiver employed in a time-division multiple access (TDMA) communication system, the receiver comprising: means for receiving an encoded signal, transmitted from a transmitter, during a first TDMA timeslot; first means, coupled to said means for receiving, for making signal weighting parameter decisions based on said received encoded signal; means, coupled to said means for making decisions, for decoding said received encoded signal based on said signal weighting parameter decisions; means, coupled to said means for decoding, for re-encoding said decoded received encoded signal; and second means, coupled to said means for re-encoding and said received encoded signal, for making signal weighting parameter decisions based on said re-encoded received encoded signal.
Claim 40
Dependent Claim
50 words
The receiver of claim 32 wherein said first and second means for making signal weighting parameter decisions further comprises first and second means for making signal weighting parameter decisions over a number of bits within the timeslot for which parameters related to said signal weighting parameters do not vary appreciably.
Claim 41
Dependent Claim
27 words
The receiver of claim 33 wherein said parameters related to said signal weighting parameters further comprise at least one of either channel gain and noise variance parameters.
Claim 42
Dependent Claim
16 words
The receiver of claim 33 wherein a windowing technique may be employed to minimize parameter variation.
References Cited (Backward Citations)
US4415872A
Cited
US4519084A
Cited
US4631735A
Cited
US4763331A
Cited
US5031195A
Cited
US5157697A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1997-01-10 | 1997-07-12 | 1998-01-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-01-10 | 2001-07-12 | 2002-01-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-01-10 | 2005-07-12 | 2006-01-11 | $7700.00 | Window Closed / Lapsed |