| 摘要 |
PROBLEM TO BE SOLVED: To realize a multi-channel repeater that selects each time slot between pluralities of portable terminals and a base station operated in the time division multiplex/time division simultaneous transmission reception system so as to conduct relay connection of them. SOLUTION: Each of transmitter-receiver sets 39-41 is a transmitter-receiver having an inter-slot relay function, branching devices 36-38 synthesize antenna terminals 51-54 of the 4 transmitter-receiver sets 39-41 and amplifiers 34, 35 amplify each insertion loss of the branching devices 36-38. Switches 32, 33 ate provided to select an incoming direction or an outgoing direction synchronously with a synchronizing signal from the transmitter-receiver 39. The input/output to/from the amplifiers 34, 35 is given to an antenna 1 via a band pass filter 31. Output power from the antenna 1 is kept nearly equal to that of each transmitter-receiver and the repeater acts like keeping an optimum state of transmission. |
