Joint Multiuser Detection and Channel Estimation for DS-UWB Communication Systems

In this paper, the DS-UWB channel estimation and multiuser detection problem are investigated. The information symbol and channel parameter are considered as unknown variable. The multiuser detector and UWB channel estimator are designed jointly. For symbol detection, the one-step predictor of channel parameter is used and the estimation error is treated as a multiplicative noise, then a Riccati equation and a Lyapunov equation will be needed. If the transmitted symbols are uncorrelated and identically distributed random variables with zero mean and unit variance, only a Riccati equation need to be solved. For UWB channel estimation, the one-step predictor of information symbol is used and the estimation error is also considered as a multiplicative noise. The solutions to the above two problem are obtained by solving a couple of Riccati equations together with two Lyapunov equations.