| 摘要 |
PROBLEM TO BE SOLVED: To easily provide transmission diversity. SOLUTION: A first radio station (base station) transmits test signals from a transmission antenna system 5 along with transmission information T1 and the characteristics of the transmission antenna system 5 are selected by an antenna switch device 4 controlled by a transmission controller 7. A second radio station (portable equipment) measures the quality of reception signals from the output of an electric field strength measurement part 20 and an intra- test-signal bit error rate measurement part 19, and when reception quality becomes lower than a prescribed value, transmits antenna switch signals to the first radio station along with the transmission information T2. In the first radio station 1 which receives the antenna switch signals, the characteristics of the transmission antenna system 5 are successively switched, the test signals are transmitted and the one of the best quality is selected from quality information corresponding to the respective antenna characteristics and used for the transmission of signals. |
