Receiver and receiving method simplifying the interference cancellation of multi-user detection in a direct sequence code division multiple access (DS-CDMA) telecommunication system

DETAILED DESCRIPTION An object of the present invention is to implement a solution in which it is avoided to generate a wideband signal and to reverse a cross correlation matrix of spreading codes and thus simplifying the interference cancellation of multi-user detection.
This is achieved with the method of the type set forth in the preamble characterized by subtracting a narrowband interfering signal estimate of one path of at least one transmitter from a narrowband composite signal propagated over several paths in the receiver in order to generate an interference cancelled signal.
A receiver of the invention is characterized by comprising an interference cancellation means comprising a plurality of interference cancellation primitives which are arranged to generate at least one narrowband interfering estimate signal describing interference, the interference cancellation means being arranged to subtract a narrowband interfering estimate signal from the narrowband composite signal.
Great advantages are achieved with the method of the invention.
Multi-user detection and interference cancellation can be performed using simple operations without regenerating a wideband signal or reversing a cross correlation matrix.
In addition, the reduction of the mutual interference of the signals simplifies power control and reduces transmission power.
This, in turn, reduces interference and allows a larger capacity of the system.