Patent ID: 6282233
Filing Date: 2001-08-28
Classification: H04B

Abstract:
A multi-user receiving apparatus for inputting a CDMA (Code Division Multiple Access) reception signal, performing an interference canceling process in parallel for each user signal on an m-th stage of M stages (where m is any integer of 1.ltoreq.m.ltoreq.M; and M is any integer that is 2 or larger), and outputting demodulated signals on the M-th stage, comprising:a plurality of IEUs (interference estimating units) disposed corresponding to the (M) stages and the number of user signals; anda plurality of subtracting units disposed corresponding to the (M-1) stages,wherein each of the IEUs inputs an interference cancellation residual signal obtained in an (m-1)-th stage interference canceling process and a signal of which a symbol replica corresponding to the same user signal on the (m-1)-th stage is weighted with a first weighting coefficient, generates an m-th stage symbol replica, outputs the m-th stage symbol replica to the (m+1)-th stage, and outputs a spread signal that is the difference between the m-th stage symbol replica and the (m-1)-th stage symbol replica weighted with the first weighting coefficient, andwherein each of the subtracting units subtracts signals of which the spread signals that are output from the IEUs on the m-th stage are weighted with a second weighting coefficient from a signal of which the (m-1)-th stage interference cancellation residual signal is delayed by a predetermined value and outputs the resultant signal to the (m+1)-th stage.