Pulse or digital communications – Repeaters – Testing
Patent
1996-09-13
1998-06-16
Chin, Stephen
Pulse or digital communications
Repeaters
Testing
375324, H04B 1500
Patent
active
057683077
ABSTRACT:
Methods and apparatus for demodulating a received communication signal employing coherent demodulation and decision-directed channel estimation are disclosed that have a significant gain compared to a receiver employing noncoherent demodulation. This is particularly so for spread spectrum communication systems such as the uplink specified by the TIA/EIA/IS-95 mobile communication standard, in which an orthogonal modulation scheme combined with convolutional coding and interleaving is used. The coherent demodulation methods and apparatus do not require a pilot signal, and thus can be used in communication systems that are originally designed for use of noncoherent demodulation.
REFERENCES:
patent: 5031193 (1991-07-01), Atkinson et al.
patent: 5151919 (1992-09-01), Dent
patent: 5218619 (1993-06-01), Dent
patent: 5237586 (1993-08-01), Bottomley
patent: 5297171 (1994-03-01), Koch
patent: 5305349 (1994-04-01), Dent
patent: 5353352 (1994-10-01), Dent et al.
patent: 5357454 (1994-10-01), Dent
patent: 5442661 (1995-08-01), Falconer
patent: 5499272 (1996-03-01), Bottomley
patent: 5506861 (1996-04-01), Bottomley
patent: 5550809 (1996-08-01), Bottomley et al.
patent: 5572552 (1996-11-01), Dent et al.
T. Miyatani et al., "A Spread Spectrum Communication System without a Reference Signal for a Frequency-Selective Fading Channel," Electronics and Communications in Japan, Part 1 (Communications), vol. 78, No. 7, ISSN 8756-6621, pp. 90-96 (Jul. 1995).
S. Haykin, Adaptive Filter Theory 3rd ed., chapts. 5, 6 (1996).
J.G. Proakis, Digital Communications 2nd ed., pp. 702-753 (1989).
H. Taub et al., Principles of Communication Systems, pp. 222-227, 378-388 (1971).
P. Schramm, "Attractive Coded Modulation Schemes for the Uplink in CDMA Mobile Communication Systems," ITG-Fachtagung Mobile Kommunikation, No. 135, pp. 255-262 (Sep. 1995).
P. Schramm et al., "Coherent Demodulation for IS-95 Uplink," IEEE International Symposium on Spread Spectrum Techniques & Applications (ISSSTA), pp. 1-5 (1996).
M. Schwartz et al., Communication Systems and Techniques, pp. 416-489 (1966).
A. Viterbi et al., "Performance of Power-Controlled Wideband Terrestrial Digital Communication," IEEE Transactions on Communications, vol. 41, No. 4, pp. 559-569 (Apr. 1993).
A. Viterbi, CDMA, Principles of Spread Spectrum Communication, pp. 77-121 (1996).
Huber Johannes
Schramm Peter
Chin Stephen
Roundtree Jospeh
Telefonaktiebolaget LM Ericsson
LandOfFree
Coherent demodulation with decision-directed channel estimation does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Coherent demodulation with decision-directed channel estimation , we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Coherent demodulation with decision-directed channel estimation will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1735132