Reverse link receiver ASIC for wideband CDMA WLL system

WLL is an access system that uses a wireless link to connect subscribers to their local exchange in place of conventional copper cable. We propose a common air interface for wideband CDMA WLL system. This paper describes design and implementation of digital receiver ASIC for the proposed wideband CDMA WLL system. The proposed reverse link transmitter structure is described. Then design specification of the reverse link receiver is described. Operation of the implemented reverse link receiver ASIC is verified by system timing simulation. Total gate number of the receiver ASIC: including code acquisition module, code tracking and data demodulation module, and Viterbi decoder module is about 150,000. For the purpose of ASIC implementation, 0.6 mu m CMOS technology is used. The implemented reverse link receiver ASIC can operate at clock frequencies up to 65.536 MHz.