Pulse or digital communications – Spread spectrum
Reexamination Certificate
2005-05-31
2005-05-31
Le, Amanda T. (Department: 2634)
Pulse or digital communications
Spread spectrum
C375S148000, C375S341000
Reexamination Certificate
active
06901103
ABSTRACT:
Methods and apparatus are presented herein for determining log likelihood ratios (LLRs) for code symbols. Pilot and code symbols are transmitted over diversity channels, which can be modeled as a slowly time varying system. A formulation for a multipath gain vector is derived herein based on the slowly time varying model. The multipath gain vector is then solved using iterative procedures. Using the solved multipath gain vector, the LLRs for code symbols are computed.
REFERENCES:
patent: 4901307 (1990-02-01), Gilhousen et al.
patent: 5103459 (1992-04-01), Gilhousen et al.
patent: 6377607 (2002-04-01), Ling et al.
patent: 6385181 (2002-05-01), Tsutsui et al.
patent: 6434203 (2002-08-01), Halter
patent: 6594318 (2003-07-01), Sindhushayana
patent: 6714585 (2004-03-01), Wang et al.
patent: 2002/0116677 (2002-08-01), Morelos-Zaragoza
patent: 2002/0136317 (2002-09-01), Oelcer et al.
patent: 2003/0031234 (2003-02-01), Smee et al.
patent: 2003/0035468 (2003-02-01), Corbaton et al.
Qinghua et al., An Iterative Receiver for Turbo-Coded Pilot-Assisted Modulation in Fading Channels, Apr. 2001, IEE Commun. Letters, vol. 5, No. 4, pp. 145-147.*
Qinghua et al., An Iterative Decoding Scheme for Pilot-Assisted Modulation in Fading Channels, Nov. 27—Dec. 1, 2000, IEEE GlobeCom., vol. 2, pp. 807-811.*
Jayaraman et al., Determining Code Symbol LLRs on Diversity Channels with Applications to CDMA 2000, Sep. 2-5, 2002, IEEE 7th Int. Symp., pp. 807-811.*
Yang, et al.,Joint blind rate detection and data decoding scheme for CDMA mobile stations in frequency selective rayleigh fading channels: pp. 449-453 XP010534093.
Nesper, et al.,A pilot symbol assisted interference cancellation scheme for an asynchronous DS/CDMA system. Global Telecommunications Conference 1447-1451 (1996).
Corbaton Ivan Jesus Fernandez
Jayaraman Srikant
Smee John Edward
Nguyen Thien T.
QUALCOMM Incorporated
Wadsworth Philip R.
Williams Lawrence B.
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