Patent ID: 6175747
Filing Date: 2001-01-16
Classification: H04B,H04Q

Abstract:
A base transceiver station in a wireless local loop system using a mobile communication system operated under a time division duplex (TDD) mode, comprising:a plurality of cell stations for accommodating subscriber units each comprising a plurality of terminals anda hybrid section comprising a multistage power combiner which is arranged between said plurality of cell stations and two transmitting and receiving antennas having a space diversity (SD) configuration and which combines the transmitting powers from the plurality of cell stations and feeds the combined power to one of said two transmitting and receiving antennas, a multistage power distributor which distributes the power received from one of said two transmitting and receiving antennas to said plurality of cell stations, a space diversity switch (SD.multidot.SW) which combines said transmitting powers toward one of said two transmitting and receiving antennas, and a time division duplex (TDD) switch which alternately switches said one transmitting and receiving antenna between transmission use and reception use based on the time division duplex (TDD) mode,said base transceiver station being provided witha common transmitting amplifier which operates in a time division multiple access (TDMA) mode in which said plurality of cell stations occupy channels individually allocated for every time slot and which is provided on the output side of said multistage power combiner common to said plurality of cell stations, anda common receiving amplifier provided on the input side of said multistage power distributor common with respect to said plurality of cell stations, and wherethe base transceiver station further includes a bias changing means which gives a bias of a level in proportion to the number of said channels in use for every said time slot to at least one amplifier between said common transmitting amplifier and said common receiving amplifier.