Transmission space diversity controlling method and transmission

Details Transmission space diversity controlling method and transmission Transmission space diversity controlling method and transmission

1997-02-25

1999-10-19

Pham, Chi H.

Multiplex communications

Communication over free space

Combining or distributing information via frequency channels

375267, 375358, 455101, 455 671, 455135, H04L 1250, H04Q 1100, H04B 702, H03C 702

Patent

active

059700610

ABSTRACT:
A transmission space diversity method which is effective also for a communication system wherein different carrier frequencies are used for transmission and reception is disclosed. Such reception space diversity control that a controlling signal from terminal station 10 is received by two antennas 1 and 2 and receivers 3 and 4 of a base station and the two received controlling signals are compared with each other by reception space diversity controlling signal generation circuit 6 and then that signal which exhibits a higher reception level is provided to switch circuit 8. Furthermore, the reception space diversity controlling signal is utilized for transmission space diversity control of antenna selection wherein the output of transmitter 5 is emitted by one of the antennas. A terminal station transmits, when the reception level thereof drops, a signal for requesting reversal of the switching direction of the antennas to the base station, then the base station reverses the transmission space diversity controlling signal in response to the request signal from the terminal station.

REFERENCES:
patent: 5097484 (1992-03-01), Akaiwa
patent: 5507035 (1996-04-01), Bantz et al.
patent: 5628052 (1997-05-01), DeStantis et al.

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