DS/CDMA receiver for high-speed fading environment

Details DS/CDMA receiver for high-speed fading environment DS/CDMA receiver for high-speed fading environment

1994-07-08

1997-07-08

Chin, Stephen

Pulse or digital communications

Receivers

Interference or noise reduction

375232, 375349, 375350, 370342, 455 65, 455506, H03D 104

Patent

active

056469640

ABSTRACT:
A receiver is disclosed for a DS/CDMA communication system wherein a symbol is spread with a predetermined spread code to produce a DS/CDMA signal which is transmitted on a radio frequency carrier. The receiver includes an interference canceller for cancelling signals from undesired sources introduced to a signal received from a desired source using a feedback signal. A phase variation canceller is provided for cancelling a phase variation that occurs in an interval between successive symbols of the received signal. Both cancellers are connected in series. A decision circuit compares an input signal from the interference canceller or from the phase variation canceller with a threshold and produces an output representing one of two discrete values depending on whether it is higher or lower than the threshold. A correction circuit derives a correction signal from a signal produced by the interference canceller and applies it to the interference canceller as the feedback signal.

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M. Abdulrahman, et al., Equalization for Interference Cancellation in Spread Spectrum Multiple Access Systems, IEEE 42nd VTS Conference Record, vol. 1, May 1992, NY, USA.
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M. Abdulrahman et al., Equalization For Interference Cancellation in Spread Spectrum Multiple Access Systems, Proceedings of VTC '92, pp. 71-74, May 1992.
A. Higashi, BER Performance of Adaptive RAKE Diversity (ARD) in DPSK DS/CDMA Mobile Radio, IEEE Second International Symposium on Spread Spectrum Techniques and Applications (ISSTA '92), 75-78, Yokohama, Japan, Nov. 29-Dec. 2, 1992.

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