Performance of blind channel estimation in long code DS-CDMA systems

We obtain the Cramer-Rao bound for blind channel estimation in DS-CDMA systems employing randomized spreading codes with periods longer than a symbol duration. The motivation for such a study is to provide a limit that can be used to illustrate the performance of different algorithms proposed to estimate the channel in this type of scenarios. Numerical results show how the algorithms performance is influenced by the parameters of the environment.