Combining circuit for a diversity receiving system

Details Combining circuit for a diversity receiving system Combining circuit for a diversity receiving system

1994-12-27

1996-04-30

Chin, Stephen

Pulse or digital communications

Receivers

Interference or noise reduction

455137, 455138, H04B 710, H04B 1702

Patent

active

055132227

ABSTRACT:
In a combining circuit comprising first and second frequency converting sections (20a, 20b) for frequency converting first and second received signals from two independent antennas (10a, 10b) under the control of a control circuit (30) into first and second frequency-converted signals, first and second preliminary amplifying sections (60a, 60b) preliminarily amplify the first and the second frequency-converted signals under the control of the control circuit (30) to produce first and second preliminary amplified signals having first and second output levels, respectively. The first and the second preliminary amplified signals have first and second noise power levels, respectively, which are equal to each other. First and second main amplifying sections (40a, 40b) mainly amplify the first and the second preliminary amplified signals by first and second amplification degrees in proportional to the first and the second output levels, respectively. The first and the second main amplifying sections produce first and second main amplified signals having first and second phases, respectively. A signal combining section (50) combines the first main amplified signal with the second main amplified signal with the first phase shifted into the second phase. The signal combining section produce a combined signal.

REFERENCES:
patent: 3902119 (1975-08-01), Skingley
patent: 4079318 (1978-03-01), Kinoshita
patent: 5263180 (1993-11-01), Hirayama et al.
Tomohiro Dohi et al., "Performance of the Unique-Word-Reverse-Modulation Type Demodulator for Mobile Satellite Communications", IMSC, 1993, pp. 455-460.

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