Telecommunications – Receiver or analog modulated signal frequency converter – Plural receivers
Patent
1979-03-22
1983-01-18
Chin, Tommy P.
Telecommunications
Receiver or analog modulated signal frequency converter
Plural receivers
455 33, 455 52, 455276, 343100CS, H04B 706, H04B 708
Patent
active
043695205
ABSTRACT:
A receiving system is disclosed that substantially instantaneously receives an RF signal. The inventive receiving system may be advantageously utilized at a central station of a mobile radio system for providing an omnidirectional receiving pattern. Both voice and digital information signals modulated on the RF signal transmitted from a mobile station are substantially instantaneously acquired by the central station. The receiving system includes an omnidirectional antenna configuration having a plurality of spatially disposed directional sector antennas, converting circuitry for converting the RF signals received by each directional sector antenna to an IF signal, IF bandpass filters for filtering each of the IF signals, and a maximal-ratio predetection diversity combiner for continuously combining the filtered IF signals to provide a composite IF signal so that any received RF signal is substantially instantaneously acquired. Because of the fast acquisition of RF signals, the receiving system will not lose the initial portion of voice and digital information signals modulated on an RF signal transmitted by a mobile station.
REFERENCES:
patent: 3472788 (1969-10-01), Bickford
patent: 3743941 (1973-07-01), Gans
patent: 3911364 (1975-10-01), Langseth
patent: 4079318 (1978-03-01), Kinoshita
patent: 4128740 (1978-12-01), Graziano
patent: 4253193 (1981-02-01), Kennard
Linear Diversity Combining Techniques, by Brennan, Proceedings of The IRE, Jun. 1950, pp. 1075-1101.
An Application for a Developmental Cellular Mobile & Portable Radio Telephone System, Submitted by American Radio Telephone Service, Inc.
AP-S International Symposium, AP-Session 5, 1640, May 17, pp. 118-121.
Cerny, Jr. Frank J.
Mikulski James J.
Chin Tommy P.
Gillman James W.
Hackbart Rolland R.
Motorola Inc.
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