摘要 |
PROBLEM TO BE SOLVED: To make the receiver small in size and to reduce the power consumption by using a demodulation circuit an a TDMA(time division multiflexing access) control circuit in common independently of the number of division areas using different radio frequency. SOLUTION: Signals with different frequencies are received by 1st - 3rd reception antennas 3a - c, become 1st intermediate frequency signals by 1st - 3rd outdoor devices 2a - c, and given to an indoor device 1. The signals are given to 2nd frequency converters 7a - c to obtain the 2nd intermediate frequency signals of the same frequency and a synthesizer 10 makes a synthesis signal. In this case, the 2nd frequency converters 7a - c are controlled by a frequency control circuit 11 so as to obtain the same frequency signal. Then a demodulation circuit 8 provided in common is used to demodulate the signal into a TDMA signal and a TDMA control circuit 9 extracts information communication from three split area subscriber stations. Thus, the demodulation circuit and the TDMA control circuit are used in common independently of the number of split regions, data collision is prevented and miniaturization and low power consumption are attained. |