Reverse link receiver ASIC for wideband CDMA WLL system

The wireless local loop (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 a wideband CDMA WLL system. This paper describes the design and implementation of a digital receiver ASIC for the proposed wideband CDMA WLL system. The proposed reverse link transmitter structure is described followed by the design specification of the reverse link receiver. The operation of the implemented reverse link receiver ASIC is verified by the system timing simulation. The total gate number of the receiver ASIC including the code acquisition module, code tracking and data demodulation module, and the Viterbi decoder module is about 150,000. For the purpose of the ASIC implementation, 0.6 μm CMOS technology is used. The implemented reverse link receiver ASIC can operate at clock frequencies of up to 65.536 MHz