Multiplex communications – Wide area network – Packet switching
Patent
1993-09-27
1995-05-09
Olms, Douglas W.
Multiplex communications
Wide area network
Packet switching
370 691, 375206, H04J 1300
Patent
active
054146992
ABSTRACT:
In an adaptive CDMA receiver (20), a Direct Sequence Spread Spectrum (DS-SS) received signal and a reference signal are equalized by minimizing the error between them. The received signal includes a desired DS-SS communication signal comprising binary bits coded with spreading chip sequences. The received signal is sampled at a chip rate to produce sampled received signals which are correlated with each other. The received samples are partially de-correlated by employing an orthogonal transformation algorithm to provide de-correlated subspace elements and correlated subspace elements. The adaptive equalization process is based on de-correlated and correlated subspace elements. Tap coefficients of a despreading equalizer (400) are updated for the de-correlated and correlated elements individually and collectively, respectively. This selective updating of tap coefficients provides for fast convergence and minimum error.
REFERENCES:
patent: 5099493 (1992-03-01), Zeger et al.
patent: 5101417 (1992-03-01), Richley et al.
patent: 5235612 (1993-08-01), Stilwell et al.
patent: 5272721 (1993-12-01), Minoshibu et al.
Ghomeshi M. Mansour
Motorola Inc.
Olms Douglas W.
Patel Ajit
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