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Multiplexer-related

Method-and-apparatus-in-a-radio-communication-system-for-mitigating-noise-and-interference-effects

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Details

Inventors: Li, Xiaojun; Satyamurti, Sunil; D'Amico, Thomas V.;
Assignee: Motorola, Inc. (Schaumburg, IL)
Primary Examiner: Eisenzopf; Reinhard J.
Assistant Examiner: Vu; Tuyen Q.
Attorney, Agent or Firm: Breeden; R. Louis

A method and apparatus for mitigating effects of multipath fading, interference, and noise in a single sideband (SSB) signal transmitted by a radio communication system and demodulated by a portable subscriber unit (122) utilizing a demodulator (304) compensated by a pilot signal power (406). The apparatus performs the mitigation process by calculating (708) a pilot fading threshold in addition to a muting threshold. When samples of the mean pilot signal power fall below the fading threshold, the compensation of the demodulated signal is adjusted (714). In addition, when the mean analog message signal power falls below the muting threshold, the samples included in the predetermined portion of the message are muted (718).

DETAILED DESCRIPTION An aspect of the present invention is a method for mitigating effects of multipath fading, interference, and noise in a single sideband (SSB) signal transmitted by a radio communication system and demodulated by a portable subscriber unit utilizing a demodulator compensated by a pilot signal.
The method comprises in the portable subscriber unit the steps of calculating a pilot fading threshold F.
sub.
th, wherein F.
sub.
th is calculated as a first predetermined function of a pilot threshold T and a predetermined desired signal/noise ratio S.
sub.
d, and adjusting compensation of the demodulator whenever pilot signal power is equal to or less than F.
sub.
th.
Another aspect of the present invention is a portable subscriber unit for mitigating effects of multipath fading, interference, and noise in a single sideband (SSB) signal transmitted by a radio communication system and demodulated by the portable subscriber unit utilizing a demodulator compensated by a pilot signal.
The portable subscriber unit comprises a receiver for receiving the SSB signal, a processing system coupled to the receiver for controlling operation of the portable subscriber unit, and a power measurement element coupled to the receiver and coupled to the processing system for measuring mean power received in portions of the SSB signal.
The receiver further comprises a demodulator coupled to the processing system and compensated by a pilot signal.
The processing system is programmed for calculating a pilot fading threshold F.
sub.
th, and F.
sub.
th is calculated as a first predetermined function of a pilot threshold T and a predetermined desired signal/noise ratio S.
sub.
d.
The processing system is further programmed for adjusting compensation of the demodulator whenever pilot signal power is equal to or less than F.
sub.
th.
A third aspect of the present invention is a radio communication system for mitigating effects of multipath fading, interference, and noise in a single sideband (SSB) signal transmitted by the radio communication system and demodulated by a portable subscriber unit utilizing a demodulator compensated by a pilot signal

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