Hardware implementation issues of cascade filters MUD for multirate WCDMA systems

Abstract

The hardware implementation issues of multiuser interference cancellation techniques for multirate asynchronous direct-sequence code division multi-access (DS-CDMA) systems based on variable spreading factor (VSF) are investigated. Based on an algorithm for monorate systems based on cascade adaptive filter multi-user detector (CF-MUD), an analysis is done to choose the best tradeoffs between hardware implementation and algorithmic performance in the third generation (3G) communication scenarios. We investigate two popular techniques, namely low-rate detector (LRD) and high-rate detector (HRD). The goal aims to extend the CF-MUD algorithm and reuse its FPGA-targeted architectures that we previously developed for multirate systems. The developed architectures can be used as an intellectual property (IP) core in a system on a programmable chip (SOPC) based on Xilinx/sup /spl copy// Virtex II Pro and Virtex II processing MUD function for asynchronous multirate systems.