DEVELOPMENT OF THE BASE STATION TRANSCEIVER SUBSYSTEM IN THE CDMA-MOBILE-SYSTEM

The base station transceiver subsystem (BTS) of the CDMA Mobile System is interfaced to mobile stations over the air and to the wired networ k through a packet switched interconnection network, The potential ben efits of CDMA technology are achieved when the transmitter and the rec eiver are properly designed and implemented. The physical layer of the air interface at the base station is implemented with the CDMA ASICs and control circuits in the channel card of the BTS. We present the de sign perspectives and structural illustration of the BTS. Base station modem ASICs and their control to implement the CDMA receiver, baseban d and RF signal processing blocks, and BTS controller are described. E laborate power control is essential to ensure the high capacity which is one of advantages of the CDMA technology. The closed loop reverse l ink power control and the forward link power control operated in the B TS are described.