Code-division-multiple-access (DS-CDMA) channels with...

Details Code-division-multiple-access (DS-CDMA) channels with... Code-division-multiple-access (DS-CDMA) channels with...

2008-05-20

2008-05-20

Nguyen, Duc M. (Department: 2617)

Multiplex communications

Communication over free space

Having a plurality of contiguous regions served by...

C370S310000, C370S329000, C455S562100

Reexamination Certificate

active

07376106

ABSTRACT:
A method for channel estimation, includes receiving an input signal due to a superposition of waveforms encoding symbols transmitted respectively by a plurality of transmitters in a common frequency band. Each transmitter among the plurality of transmitters modulates the symbols with a respective spreading code. The input signal is sampled at sampling intervals over the duration of an observation period, thus providing a sequence of samples. The sequence of complex samples is processed to estimate a channel response for each of the transmitters by maximizing, individually for each of the transmitters and based on the respective spreading code of the transmitter, a likelihood of correctly decoding the transmitted symbols using the estimated channel response.

REFERENCES:
patent: 6377416 (2002-04-01), Kikuta
patent: 6515593 (2003-02-01), Stark et al.
patent: 6697347 (2004-02-01), Ostman et al.
patent: 6839573 (2005-01-01), Youssefmir et al.
patent: 6907270 (2005-06-01), Blanz
patent: 6930991 (2005-08-01), Ozluturk

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