Demodulating system capable of accurately equalizing received si

Details Demodulating system capable of accurately equalizing received si Demodulating system capable of accurately equalizing received si

1991-03-06

1992-12-22

Safourek, Benedict V.

Pulse or digital communications

Repeaters

Testing

371 41, H04B 304

Patent

active

051739259

ABSTRACT:
In a demodulating system for demodulating a modulated signal into decoded signals (S11'-12', S21'-22'), an error signal correcting circuit (55) is used in correcting discrimination error signals (Ep, Eq) supplied from a demodulator (52) in compliance with error location signals (Sp1-2, Sq1-2) supplied from an error-correcting decoder (54) and in producing corrected discrimination error signals (Ep', Eq') for supply to an adaptive equalizer (51) which is additionally supplied with polarity signals (Dp, Dq) from a delay circuit (53). The modulated signal is equalized in accordance with the corrected discrimination error signals and the polarity signals, demodulated into demodulated signals and the discrimination error signals, and error corrected and decoded into the decoded signals. The delay circuit delays P-channel and Q-channel polarity bits of the demodulated signal into the polarity signals. The error-correcting decoder produces the error location signals by using P-channel and Q-channel error correcting code bits of the demodulated signals. The modulated signal may be supplied first to the demodulator and then to the equalizer.

REFERENCES:
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patent: 4121166 (1978-10-01), Matsumoto et al.
patent: 4928287 (1990-05-01), Tanaka
patent: 5052000 (1991-09-01), Wang et al.
Vol. II of Elements of Digital Satellite Communication written by William W. Wu and published (1985) by the Computer Science Press, pp. 279-299.

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