| 摘要 |
PURPOSE:To increase the number of channels without increasing the number of base stations by arranging directional antennas, which are directed to individual subregions from positions near a specific point, in the base station and reducing the interference of signals from mobile stations in subregions by interference wave canceling circuits. CONSTITUTION:If the division number of subregions is defined as K, the base station is installed in the center of a region, and K-number of directional antennas are used to perform the communication with mobile stations in semiregions. Each channel is divided to a maximum of K-m-number of parts by a channel signal branching circuit 13, and one of them is supplied to the main signal input of an interference wave canceling circuit 14 for the channel of the pertinent semiregion, and the others are supplied to receiving circuits for the other subregions using the same frequency. The pertinent frequency channel signal from the other subregions using the same frequency is supplied to the interference wave canceling circuit 14 as an auxiliary signal. The interference wave canceling operation is performed automatically in each interference wave canceling circuit 14, and a signal of high SIR obtained as the result is supplied to a demodulating circuit 15, and the signal is reproduced in this circuit 15. |
