Pulse or digital communications – Spread spectrum – Direct sequence
Reexamination Certificate
2005-10-18
2005-10-18
Patel, Jay K. (Department: 2637)
Pulse or digital communications
Spread spectrum
Direct sequence
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).
REFERENCES:
patent: 6377611 (2002-04-01), Hwang
patent: 6426973 (2002-07-01), Madhow et al.
patent: 6445692 (2002-09-01), Tsatsanis
patent: 6570863 (2003-05-01), Kim et al.
patent: 6570864 (2003-05-01), Kim et al.
patent: 6700923 (2004-03-01), Dowling et al.
patent: 6782036 (2004-08-01), Dowling et al.
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□□.
Choudhary Prashant
Frank Colin D.
Ghosh Amitava
Visotsky Eugene
Meek Jacob
Motorola Inc.
Pace Lalita W.
Patel Jay K.
LandOfFree
Linear minimum mean square error equalization with... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Linear minimum mean square error equalization with..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Linear minimum mean square error equalization with... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3478003