Method and apparatus for subtracting multiple rays of multiple interfering received signals

A receiver is decoded from the signal sample which was quantized and had the data symbol which is not quantized, and for which it asks received. The present group to which the request data symbol by which the receiver is not quantized corresponds, So that it may determine by subtracting the interference wave form determined by preceding with the quantity of the group decoded by the quantized request symbol preceding the interference wave form showing the sum total of the data symbol for which others do not ask. The control device which suited so that the group of the signal sample received now might be processed is included. A quantizer is quantized in order to obtain the quantized symbol which corresponds the group of the present when above-mentioned the request symbol which is not quantized was determined.