An analytic solution to the performance of iterated soft decision interference cancellation for coded CDMA transmission over frequency selective fading channels

Coded transmission over time-variant multipath Rayleigh-fading channels employing direct sequence code division multiple access (DS-CDMA) is considered. Assuming ideal knowledge of the actual channel state and randomly chosen spreading sequences, the performance of iterative multiuser equalization based on adapted MMSE-filters combined with serial successive cancellation and single user decoding is solved analytically. For this, merely the statistics of the decoder must be known. Equipped with this solution, cumbersome simulations of the whole multiuser system can be avoided to evaluate the achievable bit error ratio in a wide range of interesting parameters.