FFT-based CDMA RAKE receiver system and method

Details FFT-based CDMA RAKE receiver system and method FFT-based CDMA RAKE receiver system and method

1998-08-11

2000-11-28

Olms, Douglas W.

Multiplex communications

Generalized orthogonal or special mathematical techniques

Fourier transform

375130, H04J 1300

Patent

active

061544434

ABSTRACT:
The present invention provides a CDMA RAKE receiver that computes a data detection using Fast Fourier Transform (FFT) matched filters. Signals received are processed in frequency domain by the RAKE receiver. The RAKE receiver includes a pilot signal spreading code matched filter, a data signal spreading code matched filter and a channel matched filter. The pilot signal spreading code matched filter removes a spreading code of the pilot signal. The data signal spreading code matched filter removes a multiple access spreading code of the data signal. A channel matched filter estimates the channel frequency response and combine the received data signal from different paths before a decision is made. For increasing the CDMA system capacity, the RAKE receiver uses a interference cancellation method. A downlink receiver at a mobile station estimates the interference of a pilot signal and subtracts the pilot interference from the received signal before data detection. The uplink receivers at a base station use a multi-stage parallel interference cancellation process for removing multiple access interference from other users.

REFERENCES:
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patent: 5629929 (1997-05-01), Blanchard et al.
patent: 6009089 (1999-12-01), Huang et al.
Divsalar, D et al., "Improved CDMA Performance Using Parallel Interference Cancellation," IEEE MILCOM., pp. 911-917 (Oct. 1994).
Povery, G.J. et al. "A Decision-Directed Spread-Spectrum RAKE Receiver For Fast-Fading Mobile Channels," IEEE Trans. on Vehicular Technology, V45, pp. 491-502 (Aug. 1996).
Latva-aho, Matti et al. "Parallel Interference Cancellation Receiver for DS-CDMA Systems in Fading Channels," IEEE PIMRC, pp. 559-564, (Sep. 1997).

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