Demodulation apparatus incorporating adaptive equalizer for digi

Details Demodulation apparatus incorporating adaptive equalizer for digi Demodulation apparatus incorporating adaptive equalizer for digi

1993-05-24

1994-02-01

Grimm, Siegfried H.

Demodulators

Frequency modulation demodulator

Plural demodulation

329318, 329327, 375 14, 375102, 455303, 455312, H03D 300, H04B 112

Patent

active

052835316

ABSTRACT:
A demodulation apparatus incorporating an adaptive equalizer, capable of realizing a highly reliable communication, lower power consumption, and a compact size. In the demodulation apparatus, an output of one of two demodulators, at least one of which including an equalizer, is selected according to a presence or absence of multipath which is determined from a non-coincidence of bit codes, eye apertures, bit error ratea, or a matched filter output, while the operation of the other demodulator is stopped for reduction of power consumption, by stopping a supply of power or clock signals to the other demodulator. In a case using a frequency offset detection unit and a frequency offset memory, one of these is selected according to a convergence or divergence of an error signal from an equalizer, while the operation of the other one is stopped for reduction of power consumption.

REFERENCES:
patent: 3537008 (1970-10-01), Lakatos
patent: 4151475 (1979-04-01), von der Neyen
patent: 4246541 (1981-01-01), Ishigaki
patent: 4726073 (1988-02-01), Sessink
patent: 4859957 (1989-08-01), Braun
Shahid U. H. Qureshi, "Adaptive Equalization," Proceedings of the IEEE, vol. 73, No. 9, Sep. 1985, pp. 1349-1387.

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