CORDIC-based systolic adaptive equalizer architecture for high data rate CDMA receivers

The Rake receiver as used in conventional CDMA systems peiforms poorly in high data rate CDMA systems because the latter employ higher order modulation schemes which are less resilienf to multiple access interference. This paper investigates an adaptive equalizer receiver to address this /imitation. The weight adaptation of the equalizer is based on an array form of the RLS algorithm and utilizes Givens rotations. The BERpeformance of the receiver is validated by simulations. A piecewise regular systolic array with CORDIC processor elements to implement the receiver is described. The arithmetic complexity and throughput rate of the implementation are evaluated and compared with recent alternative receiver implementations. The proposed receiver is well suited for high data rate CDMA systems, since it meets BER performance requirements, and provides a high throughput rate with a reduced implementation complexity.