On error probabilities of DS-CDMA systems with arbitrary chip waveforms

The error probabilities of asynchronous DS-CDMA systems using random signat ure sequences depend on the number of users, the processing gain and the ch ip waveforms employed. The exact calculation of error probabilities is comp utationally difficult and therefore approximations and bounds are more comm only used. In this letter, the improved Gaussian approximation proposed by Holtzman [1] is extended to include arbitrary chip waveforms. Comparisons t o the exact calculation and the standard Gaussian approximation are also ma de to evaluate the accuracy of the improved Gaussian approximation.