The problem of joint blind channel estimation and multiple access interference (MAI) suppression for an asynchronous code-division multiple-access (CDMA) system is studied. A low-complexity sliding-window scheme based on the expectation maximization (EM) algorithm is developed for joint blind maximum a posteriori probability (MAP) multi-user detection (MUD) and stochastic maximum likelihood (ML) channel estimation in a dispersive fading channel. With multistage soft interference cancellation, MAI can be efficiently suppressed. Together with an initial value prediction method for algorithm initialization at each window, the proposed scheme can track fading channels on the fly with no phase ambiguities even when channel gains are close to zero.
|Number of pages||5|
|Journal||IEEE International Conference on Communications|
|State||Published - 18 Jul 2003|
|Event||2003 International Conference on Communications (ICC 2003) - Anchorage, AK, United States|
Duration: 11 May 2003 → 15 May 2003