Pulse or digital communications – Spread spectrum – Direct sequence
Reexamination Certificate
2005-12-13
2005-12-13
Vo, Don N. (Department: 2631)
Pulse or digital communications
Spread spectrum
Direct sequence
C375S340000
Reexamination Certificate
active
06975669
ABSTRACT:
An efficient telecommunications receiver system for accurately decoding a received composite signal having a data signal component and a pilot signal component includes a first circuit for receiving the composite signal and extracting a pilot signal and a data signal from received composite signal. A second circuit calculates a log-likelihood ratio as a function of a channel estimate based on the pilot signal. A third circuit scales the log-likelihood ratio by a predetermined log-likelihood ratio scaling factor and provides an accurate log-likelihood value in response thereto. A fourth circuit decodes the received composite signal based on the accurate log-likelihood value and the data signal. The third circuit includes a carrier signal-to-interference ratio circuit for computing a first signal-to-interference ratio and a second signal-to-interference ratio based partly on the pilot signal.
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M.C. Valenit, et al. “Refined Channel Estimation for Coherent Detection of Turbo Codes Over Flat-Fading Channels,” Electronics Letters, GB, IEEE Stevenage, vol. 34, No. 17, Aug. 20, 1998. (pp. 1648-1649).
M.C. Valenti, et al. “A Bandwidth Efficient Pilot Symbol Technique for Coherent Detection of Turbo Codes Over Fading Channels,” Milcom 1999. IEEE Military Communications Conference Proceedings, Atlantic City, NJ, USA, Oct. 31-Nov. 3, 1999. (pp. 81-85, vol. 1).
Esteves Eduardo A. S.
Ling Fuyun
Sindhushayana Nagabhushana T.
Beladi S. Hossain
Godsey Sandra L.
Qualcomm Incorporated
Vo Don N.
Wadsworth Philip
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