Patent ID: 7075916
Filing Date: 2006-07-11
Classification: H04B

Abstract:
1. A parallel interference cancellation apparatus for sequentially canceling interference in asynchronous signals received from respective users or paths in a code division multiple access system using multiple transfer rates, the apparatus comprising: a signal reproducing means for performing de-spreading operation of the received signals from the respective users or paths and then reproducing said signals using a channel estimation value; a remaining signal generating means for summing said reproduced signals on a corresponding receive time axis and subtracting said summed signals from said input received signals to generate remaining signals; a de-spreading means for summing the remaining signals generated by said remaining signal generating means to said signals from the respective users or paths to generate signals from which interference is cancelled and for performing a de-spreading operation on the interference cancelled signals; a rate detection means for receiving the signals from respective users or paths to detect multiple transmission rates and an asynchronous trigger point for respective users; and a controller for controlling said signal reproduction means, said remaining signal generating means and said de-spreading means using said multiple rates and said asynchronous trigger point for respective users.