Abstract: An interference canceller for canceling narrowband interference from a received broadband signal takes advantage of the fact that the correlation time for the narrowband interference signal will be significantly greater than the correlation time for the desirable broadband signal. The interference canceller operates by creating a replica of the narrowband interference signal in an auixiliary channel and subtracts it from the main channel to cancel the interference. The auxiliary channel has a delay time larger than the correlation time of the desirable broadband signal. In-phase and quadrature versions of the delayed signal are multiplied by respective weights and subtracted from the received signal to produce an interference-reduced signal. The weights are are adjusted by an adaptive block to minimize the power in the interference-reduced output signal.

Abstract: In a cellular communications system (10) in which a plurality of mobile subscriber units (100) attempt to access at least one BTS (140), which is controlled by a controller (150), a method of controlling system congestion is provided. The subscriber units (100) record a number of failed access attempt transmissions (210). The failed attempt data (122, 124) is transmitted (220) to the BTS (140) in subsequent access messages (120). From the failed attempt data (122, 124), the controller (150) generates an array of access restriction values (172), which are transmitted to the subscriber units (100) within the Access Parameters Message (170). The access restriction values (172) are used by the subscriber units (100) to perform one or more persistence tests (240, 245, 250). The access restriction values (172) control the probability of the persistence tests (240, 245, 250) passing for any given access slot.