Pulse or digital communications – Receivers – Particular pulse demodulator or detector
Patent
1996-09-19
1999-08-10
Chin, Stepehen
Pulse or digital communications
Receivers
Particular pulse demodulator or detector
375346, 371 21, 371 436, H04B 110, H04L 100, H03M 1322
Patent
active
059370157
ABSTRACT:
A digital information bit that has been encoded and transmitted as a first modulated signal from a first transmitter in the presence of a second modulated signal that has been transmitted by a second transmitter is received and decoded by receiving a composite signal that is a sum of the first modulated signal and the second modulated signal. The composite signal is processed to generate a complex numerical sample. Then, a plurality of bit pairs are hypothesized, wherein each hypothesized bit pair includes a hypothesized first information bit encoded and transmitted by the first transmitter and a hypothesized second information bit encoded and transmitted by the second transmitter. For each of the plurality of hypothesized bit pairs, a path metric is generated that is indicative of a likelihood that information sequence estimates are accurate estimates, wherein the information sequence estimates include the hypothesized first and second information bits. For each of the plurality of hypothesized bit pairs, the generated path metric is added to a previously determined cumulative path metric to generate a most recent cumulative path metric. An information sequence estimate is selected that has a lowest most recent cumulative path metric, wherein the selected information sequence estimate includes an information sequence estimated to have been encoded and transmitted by the first transmitter and an information sequence estimated to have been encoded and transmitted by the second transmitter.
REFERENCES:
patent: 4833693 (1989-05-01), Eyuboglu
patent: 5091918 (1992-02-01), Wales
patent: 5230003 (1993-07-01), Dent et al.
patent: 5335250 (1994-08-01), Dent et al.
patent: 5377183 (1994-12-01), Dent
patent: 5406585 (1995-04-01), Rohani et al.
patent: 5537443 (1996-07-01), Yoshino et al.
patent: 5559561 (1996-09-01), Wei
patent: 5583886 (1996-12-01), Rohani et al.
patent: 5619503 (1997-04-01), Dent
patent: 5640432 (1997-06-01), Wales
patent: 5673291 (1997-09-01), Dent
K. Giridhar, et al., "Joint Estimation Algorithms for Cochannel Signal Demodulation", Proceedings Of The International Conference On Communications 1993, May 23-26, 1993, New York, U.S., pp. 1497-1501.
Hidekazu Murata, et al., "Maximum-Likelihood Sequence Estimation for Coded Modulation in the Presence of Co-Channel Interference and Intersymbol Interference", IEEE Vehicular Technology Conference 1996, Apr. 28, 1996, New York, U.S., pp. 701-705.
K. Giridhar, et al., "A Blind Adaptive MAP Algorithm for the Recovery of Cochannel Signals", Proceedings Of The Military Communications Conference 1994, Oct. 2-5, 1994, New York, U.S., pp. 133-138.
K. Giridhar, et al., "Joint Demodulation of Cochannel Signals Using MLSE and MAPSD Algorithms", International Conference On Acoustics, Speech, 1993, Apr. 27-30, 1993, New York, U.S., pp. IV-160-IV-163.
Richard Gooch, et al., "Demodulation of Cochannel QAM Signals", International Conference On Acoustics, Speech and Signals Processing 1989, May 23-26, 1989, New York, U.S., pp. 1392-1395.
Bottomley Gregory E.
Dent Paul W.
Chin Stepehen
Gluck Jeffrey W.
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