| 摘要 |
PROBLEM TO BE SOLVED: To expand communication area using a relay system, capable of easily constructing a transmission and reception area between an access point and a radio terminal in a radio LAN where a plurality of channels are used. SOLUTION: A crossbar switch 81 is sent to frequency converting parts 41 to 44 of a set channel, converted into the frequency band of each channel and sent to amplifiers 21 to 24. Before that level detector 31 to 34 detect whether the channel is in a transmission state, and when the channel is in the transmission state, a control signals is sent continuously to switches 61 to 64, and the switches 61 to 64 go into 'OFF' state to stop receiving the channel. Thus, the intra-station loop of radio waves is eliminated. |
