Phase compensation method and apparatus

Details Phase compensation method and apparatus Phase compensation method and apparatus

1992-03-26

1994-03-29

Chin, Stephen

Pulse or digital communications

Repeaters

Testing

375118, 328155, H03D 104, H03D 106, H03K 501, H03K 604

Patent

active

052992322

ABSTRACT:
A method of and apparatus for compensating a received signal's phase compensates for the distortion caused by the asymmetrical characteristics of a voltage limiter. This compensation allows the received signal to be sampled at the positive and negative zero-crossings reducing the requirements of a local oscillator in a radiotelephone system. First, the phase of the received signal is sampled at the positive and negative zero-crossings, forming a corresponding positive-crossing and a negative-crossing phase value for the received signal. Second, the negative-crossing and positive-crossing phase values are combined, forming a first difference signal. Third, an estimated error signal is formed using the first difference signal. Fourth, the estimated error signal is combined with the positive or negative zero-crossing phase signals, substantially eliminating the asymmetrical distortion.

REFERENCES:
patent: 4788696 (1988-11-01), Sakane et al.
patent: 4797730 (1989-01-01), Smith
patent: 4803385 (1989-02-01), Nawata
patent: 5128968 (1992-07-01), Yoshida

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