Radio receiving system with adaptive antennas having reduced var

Details Radio receiving system with adaptive antennas having reduced var Radio receiving system with adaptive antennas having reduced var

1995-10-26

1998-06-16

Eisenzopf, Reinhard J.

Telecommunications

Receiver or analog modulated signal frequency converter

With wave collector

455138, 4552342, H04B 106, H04B 700

Patent

active

057686980

ABSTRACT:
A receiving system comprises a plurality of receiving branches 1, 2, - - - n each including an adaptive antenna. A variable gain controlled amplifier 31, 32, - - - 3n is provided in each receiving branch 1,2, - - - n for setting an amplification factor of a receiving signal in each receiving branch. Automatic gain control unit 7 inputs receiving signals from the plural receiving branches 1,2, - - - and n at predetermined sampling intervals and controls the amplification factors of the variable gain controlled amplifiers 31, 32, - - - 3n. An adaptive antenna processing unit 8 performs an adaptive antenna processing based on the receiving signals sent from the plural receiving branches 1,2, - - - n. A timing control device 71, 72 or 73 allows the automatic gain control unit 7 to renew the amplification factor of each variable gain controlled amplifier 31, 32, - - - 3n in response to each elapse of a predetermined interval longer than the sampling interval of the automatic gain control unit 7. The automatic gain control unit 7 independently controls the amplification factors of the variable gain controlled amplifiers 31, 32, - - - 3n.

REFERENCES:
patent: 4513412 (1985-04-01), Cox
patent: 4857928 (1989-08-01), Gailus et al.
patent: 5086437 (1992-02-01), Tomita
patent: 5119508 (1992-06-01), Shamasundara
patent: 5184349 (1993-02-01), Riordan
patent: 5361404 (1994-11-01), Dent
patent: 5436933 (1995-07-01), Andruzzi, Jr.
patent: 5493712 (1996-02-01), Ramesh et al.
Takeo Ohgane et al, A Design of GMSK/TDMA System with Adaptive Array in Land Mobile Radio Communications, pp. 71-74.

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