Pulse or digital communications – Receivers – Interference or noise reduction
Patent
1995-11-16
1996-09-24
Tse, Young T.
Pulse or digital communications
Receivers
Interference or noise reduction
455133, 4552771, 370 953, H04B 712, H04B 726
Patent
active
055598382
ABSTRACT:
A diversity receiving apparatus includes a plurality of receivers, each of which receives a plurality of signals and includes a detector which selects and outputs a desired signal from the received signals, and a delay circuit which delays the desired signal to produce a delayed signal. A level comparator compares signal levels of the desired signals outputted from the detectors with one another, and produces an output indicating which one of the desired signals has a highest signal level. A selector responsive to the output of the level comparator selects and outputs the delayed signal produced by the delay circuit delaying the desired signal having the highest signal level. A demodulator demodulates the selected delayed signal. A power controller supplies power to the level comparator and all of the receivers at a preset level comparison period, continues to supply power to the receiver including the detector outputting the desired signal having the highest signal level after the level comparator has finished comparing the signal levels of the desired signals with one another until a next level comparison period, and stops supplying power to the level comparator and all of the receivers except the receiver including the detector outputting the desired signal having the highest signal level after the level comparator has finished comparing the signal levels of the desired signals with one another until the next level comparison period.
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Journal of the Institute of Electronics, Information and Communication Engineers of Japan, vol. 73, No. 8, Aug. 1990, pp. 812-818 (in Japanese).
Hitachi , Ltd.
Tse Young T.
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