Interference canceller for CDMA

Details Interference canceller for CDMA Interference canceller for CDMA

1997-03-10

1999-07-27

Pham, Chi H.

Multiplex communications

Generalized orthogonal or special mathematical techniques

370342, 375346, 455 63, H04B 7216, H04J 1302

Patent

active

059302291

ABSTRACT:
A code-orthogonalizing filter 101 performs inverse spread using an orthogonalizing coefficient, which is obtained through a constraint condition process on a code multiplexed received signal as an input with a desired spread code waveform and independent on transmission line variations, thus detecting a desired wave at a constant power level while suppressing interference waves. A carrier tracking circuit 102 effects carrier phase synchronization of the detected desired wave. A symbol decision unit 104 decides the output of the carrier tracking circuit 102 to be the most certain symbol. An adder 104 extracts as symbol decision error signal from the outputs of the symbol decision unit 103 and the carrier tracking circuit 102. A tap coefficient control means 105 adaptively updates the tap coefficient according to the input to the code-orthogonalizing filter 101, a reproduced carrier outputted from the carrier tracking circuit 102, a symbol decision error signal outputted from the adder 104 and the desired wave spread code waveform.

REFERENCES:
patent: 5163044 (1992-11-01), Golden
patent: 5550811 (1996-08-01), Kaku et al.
patent: 5687162 (1997-11-01), Yoshida et al.
patent: 5694388 (1997-12-01), Sawahashi et al.
patent: 5734647 (1998-03-01), Yoshida et al.
Yoshida, et al., IEICE Transaction on Communications, "DS/CDMA Adaptive Interference Canceller on Differential Detection for Fast Fading Channel", vol. J77-B11, No. 11, Nov. 1994, pp. 618-627.

Affiliated with

Also associated with

Rating

Interference canceller for CDMA does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Interference canceller for CDMA, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Interference canceller for CDMA will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-887406