Pulse or digital communications – Spread spectrum – Direct sequence
Reexamination Certificate
2007-10-30
2007-10-30
Patel, Jay K (Department: 2611)
Pulse or digital communications
Spread spectrum
Direct sequence
C375S343000, C708S403000
Reexamination Certificate
active
10644361
ABSTRACT:
K data signals, or bursts, are transmitted over a shared spectrum in a code division multiple access communication format. A combined signal is received and sampled over the shared spectrum, as a plurality of received vector versions. The combined signal includes the K transmitted data signals. A plurality of system matrices and an associated covariance matrix using codes and estimated impulse responses of the K data signals is produced. Each system matrix corresponds to a received vector version. The system and covariance matrices are extended and approximated as block circulant matrices. A diagonal matrix of each of the extended and approximated system and covariance matrices are determined by prime factor algorithm-fast Fourier transform (PFA-FFT) without division of the matrix. The received vector versions are extended. A product of the diagonal matrices and the extended received vector versions is taken. An inverse block discrete Fourier transform is performed by a PFA-FFT on a result of the product to produce the estimated data of the K data signals.
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Haim John W.
Kwak Jaeyoung
Pan Jung-Lin
Zeira Ariela
InterDigital Technology Corporation
Panwalkar Vineeta
Patel Jay K
Volpe and Koenig P.C.
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