Generalized two-stage data estimation

Details Generalized two-stage data estimation Generalized two-stage data estimation

2005-08-30

2005-08-30

Tse, Young T. (Department: 2637)

Pulse or digital communications

Spread spectrum

Direct sequence

C370S210000, C370S342000

Reexamination Certificate

active

06937644

ABSTRACT:
Symbols are to be recovered from signals received in a shared spectrum. Codes of the signals received in the shared spectrum are processed using a block Fourier transform (FT), producing a code block diagonal matrix. A channel response of the received signals is estimated. The channel response is extended and modified to produce a block circulant matrix and a block FT is taken, producing a channel response block diagonal matrix. The code block diagonal matrix is combined with the channel response block diagonal matrix. The received signals are sampled and processed using the combined code block diagonal matrix and the channel response block diagonal matrix with a Cholesky algorithm. A block inverse FT is performed on a result of the Cholesky algorithm to produce spread symbols. The spread symbols are despread to recover symbols of the received signals.

REFERENCES:
patent: 6625203 (2003-09-01), De et al.
patent: 2003/0095586 (2003-05-01), Geers
patent: 2004/0013171 (2004-01-01), Pan et al.
patent: 2004/0136316 (2004-07-01), Kwak et al.
Pan et al., “Low Complexity Data Detection Using Fast Fourier Transform Decomposition of Channel Correlation Matrix,” InterDigital Communications Corp., Nov. 2001.

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