Telecommunications – Transmitter and receiver at separate stations
Patent
1980-11-21
1983-05-10
Chin, Tommy P.
Telecommunications
Transmitter and receiver at separate stations
455 52, 370 29, 375 40, H04B 708, H04B 702
Patent
active
043833322
ABSTRACT:
The present invention relates to a mobile radio base station (14) capable of communicating with a large number of mobile stations by implementing space diversity and time-division retransmission techniques in a digital communication system. The digital base station contains a plurality of antenna elements (16.sub.1 -16.sub.M) and a plurality of retransmission branches (18.sub.1 -18.sub.M) associated in a one-to-one relationship. When the base station receives a digital communication signal from a mobile station, each antenna element receives the signal with a unique random phase (.theta..sub.1 -.theta..sub.m) due to the effects of the environment on signal transmission. The signal is then processed through the plurality of retransmission branches, where each branch adapts to compensate for the random phase of the signal received by its associated antenna element. Conversely, when the base station transmits a signal back to the mobile station, each retransmission branch adds the conjugate of its associated random phase to the signal to be transmitted, allowing the environment to "undo" the effect of the conjugate random phase so that the signals transmitted by the plurality of antenna elements will arrive coherently at the mobile station.
REFERENCES:
patent: 3566274 (1971-02-01), Di Toro
patent: 3631494 (1971-12-01), Gans
patent: 3662268 (1972-05-01), Gans
patent: 3663107 (1972-01-01), Brady
patent: 3693088 (1972-09-01), Rustako
patent: 3696421 (1972-10-01), Bitler
patent: 3717814 (1973-02-01), Gans
patent: 4057758 (1977-01-01), Hattori
A Mobile Radio Single-Frequency two-way Diversity System Using Adaptive Retransmission from the Base, by J. S. Bitler et al. IEEE Transactions on Communications, vol. COM-21, No. 11, pp. 1241 to 1247, Nov. 1973.
Diversity Techniques for Mobile Radio Reception, by J. D. Parsons et. al., IEEE Transactions on Vehicular Technology, vol. VT-25, No. 3 pp. 75-85, Aug. 1976.
Fundamentals of Diversity Systems, Diversity Techniques, by W. C. Jakes, Microwave Mobile Communications, New York: Wiley, pp. 309-531 Published 1974.
Glance Bernard
Henry Paul S.
Bell Telephone Laboratories Incorporated
Chin Tommy P.
Pfeifle Erwin W.
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