Linear minimum mean square error equalization with...

Pulse or digital communications – Spread spectrum – Direct sequence

Reexamination Certificate

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C375S232000, C375S346000

Reexamination Certificate

active

06956893

ABSTRACT:
The present invention provides linear MMSE equalization with parallel interference cancellation for symbol determination in a forward link of a CDMA communication system which has a plurality of code channels in use. Use of the linear MMSE equalization with parallel interference cancellation of the present invention provides significantly increased performance. The preferred method linearly filters a received signal to form a first filtered signal (410), despreads and demodulates the first filtered signal (415, 420) and provides a plurality of symbol estimates for all corresponding code channels (430). An estimated transmitted signal is generated from the plurality of symbol estimates (435), and with a channel estimate (405), an estimated received signal is generated (440). A residual signal is determined as a difference between the received signal and the estimated received signal, is linearly filtered (445), and then combined with the estimated transmitted signal to form a next, enhanced estimated transmitted signal (450). This next estimated transmitted signal is despread (455, 460) and utilized to provide a next plurality of symbol estimates, for a selected code channel of the plurality of channels, for subsequent use in error correction and decoding, and further use by a subscriber (465, 475).

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Adaptive MMSE receivers for comm. in non-stationary multipath fading channel□□Fantacci, R et al; Spread Spectrum Techniques & Applications, 2000 IEEE Sixth International Symposium , vol.: 2 , Sep. 6-8, 2000;pp.: 545-549.
LMMSE detection for DS-CDMA systems in fading channels□□Latva-Aho, M.; Juntti, M.J.;□□Communications, IEEE Transactions on , vol.: 48, Issue: 2, Feb. 2000 □□pp.: 194-199□□.
MMSE Interference suppression for coded multicarrier DS-CDMA in the presence of intermodulation□□Weiping Xu; Milstein, L.B.;□□Wireless Communications and Networking Conference, 1999. WCNC. 1999 IEEE , Sep. 21-24, 1999 □□pp.: 85-89 vol. 1□□.

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