Bit-Error-Rate Performance Evaluation of SMI-MSINR and SMI-MVDR DS/CDMA Receivers

We propose a method to approximate the Bit-Error-Rate (BER) performance of CDMA systems employing Sample-Matrix-Inversion (SMI) Maximum-Signal-to-Interference-plus-Noise-Ratio (MSINR) and SMI Minimum-Variance-Distortionless-Response (MVDR) linear receivers. In the proposed method, two forms of the Gaussian Q-function are approximated by finite series of exponentials and exponentially decaying cosines that are optimized using a relative error measure. The proposed method provides highly accurate closed form approximations to the BER performance for a wide range of practical scenarios with very low complexity.