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

Abstract

The bit-error rate (BER) analysis of an asynchronous cellular direct-sequence code-division multiple-access (DS-CDMA) system with channel fading and random mobile locations often results in a multiintegral expression, even though the Gaussian approximation is applied. In the paper, saddlepoint integration (SPI) is proposed to simplify the analysis. The computational complexity 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 derived 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.