Forward-link analysis of cellular DS-CDMA over generalised fading channelsusing saddlepoint integration

The bit-error rate (BER) analysis of an asynchronous cellular direct-sequen ce code-division multiple-access (DS-CDMA) system with channel fading and r andom mobile locations often results in a multiintegral expression, even th ough the Gaussian approximation is applied. In the paper, saddlepoint integ ration (SPI) is proposed to simplify the analysis. The computational comple xity grows only linearly with the number of interfering cells in the system , regardless of the number of mobiles in each cell. By making use of the de rived expression, the BER performance for arbitrary Nakagami parameters and path-loss exponents is evaluated efficiently. Simulation results show that the SPI technique is accurate and reliable.