Performance Simulation of a Fixed-Point rake receiver on cdma2000 lx reverse link

摘要

The majority of the performance analysis of rake receiver presented in the cdma2000-lx has assumed the use of floating point arithmetic. However, if fixed-point arithmetic is employed, a corresponding degradation in the BER performance of the rake receiver is expected. In this paper, we present the performance degradation due to the finite word length implementation of the rake receiver with various A/D quantizers for a cdma2000-lx base station. The 4-bit, 6-bit and 8-bit resolution A/DS are used in some simulation runs to compare their impact on performance, 4-bit viterbi decoder is used in all the fixed-point simulations. It is show that, with proper design, the BER(Bit Error Ration) performance with 8-bit A/D seems sufficiently close to that of the floating point implementation.