Importance

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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.

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First Claim