Crosspole interference canceling receiver for signals with unrel

Details Crosspole interference canceling receiver for signals with unrel Crosspole interference canceling receiver for signals with unrel

1996-04-17

1998-11-17

Tse, Young T.

Pulse or digital communications

Receivers

Interference or noise reduction

375349, 342362, 455295, 455296, H04B 110

Patent

active

058387404

ABSTRACT:
Crosspolarized signals of unrelated baud rates transmitted through a communication channel (10) become depolarized due to channel distortions such as rain and antenna imperfections. The resulting interference is canceled in a Modified Adaptive Crosspole Interference Canceler (MAXPIC) receiver (50, 70) by adjustment the timing in the crosspolarization path to compensate for the differential delay. Near equivalent bit error rate (BER) performance is achieved for systems utilizing crosspolarized signals with independent baud rates. In one embodiment, the receiver uses a fractionally spaced finite impulse response (FIR) filter (78) that operates at an integer multiple of the direct channel signal baud rate. In another embodiment, a variable delay (54) is used to time-align the received crosspolarized channel signal with the crosspolarization interference contained in the received direct signal.

REFERENCES:
patent: 4577330 (1986-03-01), Kavehrad
patent: 4606054 (1986-08-01), Amitay et al.
patent: 4635276 (1987-01-01), Karabinis
patent: 4910468 (1990-03-01), Ohtsuka et al.
patent: 4914676 (1990-04-01), Iwamatsu et al.
patent: 5406589 (1995-04-01), Iwamatsu et al.
patent: 5432522 (1995-07-01), Kurokami

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