Performance Analysis of Iterative Channel Estimation and Multiuser   Detection in Multipath DS-CDMA Channels
  This paper examines the performance of decision feedback based iterative channel estimation and multiuser detection in channel coded aperiodic DS-CDMA systems operating over multipath fading channels. First, explicit expressions describing the performance of channel estimation and parallel interference cancellation based multiuser detection are developed. These results are then combined to characterize the evolution of the performance of a system that iterates among channel estimation, multiuser detection and channel decoding. Sufficient conditions for convergence of this system to a unique fixed point are developed. 
Husheng Li, Sharon M. Betz and H. Vincent Poor