Rotation-based adaptive equalizer architecture for high data rate CDMA systems

This paper proposes an efficient adaptive equalizer receiver architecture for high data rate CDMA systems. The proposed receiver includes an adaptive equalizer and conventional Rake receiver in cascade. A recursive algorithm to update the coefficients of the adaptive equalizer is derived. The algorithm is based on an adaptive array formulation that utilizes a square root and division free variation of given rotations. A piecewise regular systolic array architecture with simple processing cells to implement the algorithm is described. It is verified by comparisons that the proposed receiver is an attractive alternative to other recent implementations since it meets bit error rate performance requirements, is numerically stable and is amenable to a low complexity implementation while retaining a high throughput rate.