Apparatus and method for demodulating a modulated signal

Details Apparatus and method for demodulating a modulated signal Apparatus and method for demodulating a modulated signal

1996-10-21

1998-06-16

Mis, David

Demodulators

Phase shift keying or quadrature amplitude demodulator

329316, 375329, 375200, 455133, H03D 300, H04L 2722

Patent

active

057677387

ABSTRACT:
A receiver (156) includes both a coherent and noncoherent demodulator. When the confidence that estimates of the channel is high, the coherent demodulator is implemented. When the confidence that estimates of the channel is low, the noncoherent demodulator is implemented. A controlling microprocessor (162) controls the selection process and also provides a signal (158) to enable the noncoherent demodulator in instances when noncoherent demodulation would most likely be better than coherent demodulation. As an example, such an instance would be immediately after handoff of a mobile station (505) from a source base-station (503) to a target base-station (502).

REFERENCES:
patent: 5214391 (1993-05-01), Serizawa et al.

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