Reception of M-ary PSK-modulated signals

Details Reception of M-ary PSK-modulated signals Reception of M-ary PSK-modulated signals

2005-03-29

2005-03-29

Tran, Khai (Department: 2637)

Pulse or digital communications

Receivers

Angle modulation

C375S229000

Reexamination Certificate

active

06873663

ABSTRACT:
A phase shift keying (PSK) receiver includes a limiter and a first receive filter. In order to compensate for distortion introduced by the limiter, the amplitude limited signal is subjected to equalization prior to being supplied to the first receive filter. Equalization is performed by receiving a digital input signal representing an output of the limiter, estimating an amplitude modulation component as a function of the digital input signal, and generating the equalized signal by modifying the digital input signal as a function of the estimated amplitude modulation component. The amplitude modulation component may be estimated by generating a filtered signal by filtering the digital input signal in accordance with a filtering characteristic that is substantially identical to a filtering characteristic of the first receive filter, and then generating the amplitude modulation component by measuring the amplitude of the filtered signal. The amplitude modulation component then serves as a basis for modulating the digital input signal, thereby approximately restoring amplitude modulation components that were lost by the limiter.

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