Efficient Bit Error Analysis of Asynchronous Code-Division Multiple-Access Systems in Rician Fading

摘要

The paper deals with code-division multiple-access (CDMA) systems where users employ random code sequences and transmit asynchronously. It is assumed that the transmitted signals propagate through statistically independent, Rician fading channels. Bit error evaluation of CDMA systems in Rician fading is considered. Based on a flat Rician fading model and the Simplified Improved Gaussian Approximation (SIGA) method, new closed-form equations are derived for the bit error probability (BEP). The new SIGA equations allow one to analyze the effects of both deterministic and Rayleigh fading signal components on the BEP. The new equations are efficient and accurate as long as the CDMA processing gain is large and are subject to some limitations on system parameters. Computational data confirm the validity of the new equations and indicate how Rician parameters affect the BEP.