Patent ID: 7088699

Claim:
A reception method in a cellular radio system including in each cell, at least one base station communicating with terminals located in its area and in which system Code Division Multiple Access is employed, wherein a received signal includes a sum signal of signals originating from several transmitters, the method comprising: performing interference elimination and a simultaneous multi-user detection to said received signal, including generating an estimate for the received signal, wherein the estimate includes one or more estimates of a received user signal, and the effect of the symbols estimated on the symbol level is subtracted from the received sum signal, whereby a narrowband, symbol-level residual signal is obtained, correlating the received signal by a particular spreading code, whereby a first symbol-level signal is obtained, correlating the computed estimate by the same spreading code, whereby a second symbol-level signal is obtained, and subtracting the second symbol-level signal from the first symbol level signal, whereby a narrowband, symbol-level residual signal is obtained.