Pulse or digital communications – Spread spectrum – Direct sequence
Reexamination Certificate
2007-02-27
2007-02-27
Phu, Phuong (Department: 2611)
Pulse or digital communications
Spread spectrum
Direct sequence
C375S148000
Reexamination Certificate
active
10651446
ABSTRACT:
Demodulator architectures for processing a received signal in a wireless communications system. The demodulator includes a number of correlators coupled to a combiner. Each correlator typically receives and despreads input samples (which are generated from the received signal) with a respective despreading sequence to provide despread samples. Each correlator then decovers the despread samples to provide decovered “half-symbols” and further demodulates the decovered half-symbols with pilot estimates to generate correlated symbols. The decovering is performed with a Walsh symbol having a length (T) that is half the length (2T) of a Walsh symbol used to cover the data symbols in the transmitted signal. The combiner selectively combines correlated symbols from the assigned correlators to provide demodulated symbols. One or more correlators can be assigned to process one or more instances of each transmitted signal. The pilot estimates used within each assigned correlator to demodulate the decovered half-symbols are generated based on the signal instance being processed by that correlator.
REFERENCES:
patent: 5490165 (1996-02-01), Blakeney et al.
patent: 5506865 (1996-04-01), Weaver, Jr.
patent: 6594286 (2003-07-01), Chen et al.
patent: 6628702 (2003-09-01), Rowitch et al.
Ekvetchavit Thunyachate
Lee Way-Shing
Rowitch Douglas Neal
Nguyen Thien T.
Oehling George T
Phu Phuong
Qualcomm Incorporated
Rouse Thomas R.
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