Cross polarization interference canceller

Details Cross polarization interference canceller Cross polarization interference canceller

1992-11-24

1995-01-17

Chin, Stephen

Pulse or digital communications

Repeaters

Testing

375102, 375 11, 370 6, 455295, 455296, H03D 104, H04B 110

Patent

active

053832248

ABSTRACT:
In a cross polarization interference canceller for use in digital radio communications, a signal processing circuit monitors whether numbers of word sync signals and error pulses obtained in error correction decoding exceed specified values, and outputs reset signal RS1 when an abnormality is detected. A signal level detection circuit outputs reset signal RS2 when it is detected that a level of a different polarization side baseband signal from a demodulator is lower than specified. A logical sum RS3 of reset signals RS1 and RS2 is supplied to a cross polarization interference cancellation device, which may have a transversal filter. When the word is not synchronized or the number of error pulses generated in error correcting decoding exceeds the specified value, the self-polarization side can be protected from unnecessary interference and disturbance and the self-polarization side data can be protected from disturbance even though an abrupt abnormality occurs in different polarization signals.

REFERENCES:
patent: 4688235 (1987-08-01), Tahara et al.
patent: 4910468 (1990-03-01), Ohtsuka et al.
patent: 4914676 (1990-04-01), Iwamatsu et al.

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