Fading equalizer

Details Fading equalizer Fading equalizer

1996-11-07

1999-12-07

Pham, Chi H.

Pulse or digital communications

Receivers

Interference or noise reduction

375349, H04B 710, H01L 102

Patent

active

059995793

ABSTRACT:
In order to avoid a floor phenomenon of an error rate without insertion of a datum signal, a fading equalizer, for which it is assumed that a series of symbols that represent quadrature detect output are I(n) and Q(n) (n: natural number) and an assumed maximum fading frequency is F(max), and which demodulates a modulation wave that is to be transmitted whose data are carried by phase or amplitude modulation, or both, of a radio frequency carrier, includes a symbol extractor, for performing sampling of a signal at time intervals of 1/(2 F.sub.max) or smaller, in accordance with the series of symbols; N fading estimation units, for calculating a series of fading vectors F.sub.v (n) by using tentative transmission signals, signals for which likelihood is determined, and extracted symbols; N compensators, for performing fading compensation for the series of symbols by using fading that is estimated by the fading estimation units; and a selector for selecting one of a series of N symbols that are obtained by the fading compensation.

REFERENCES:
patent: 3633107 (1972-01-01), Brady
patent: 4733402 (1988-03-01), Monsen
patent: 5291519 (1994-03-01), Tsurumaru
patent: 5465271 (1995-11-01), Hladik et al.
patent: 5481572 (1996-01-01), Skold et al.
patent: 5648983 (1997-07-01), Kostic et al.
patent: 5671221 (1997-09-01), Yang

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