Signal detector used in wireless communication system

A receiver of a wireless communication device used in a wireless communication environment in which multiple wireless communication devices communicate with each other using different transmission signal bandwidths, the receiver comprising a multi-user detector that includes:

• a plurality of bandlimiting filters with different passbands corresponding to a plurality of signals transmitted from the other wireless communication devices and contained in an input signal, said other wireless communication devices having transmission-end filters with different passbands;
• a channel estimator configured to estimate channel state information of each of said plurality of signals using signal information taking into account inter-symbol interference caused by the transmission-end filters and a receiving-end filter of the receiver;
• a minimum mean square error filter configured to calculate a filter coefficient using the estimated channel state information and the signal information and to equalize the associated bandlimited signal;
• a soft-in soft-out decoder configured to decide on each of user data items contained in the signals on the basis of the signal information and to calculate a likelihood of each of symbols mapped to a signal space;
• a replica generator configured to generate a symbol sequence replica based on the likelihood and to produce a received signal replica using the symbol sequence replica and the signal information, the symbol sequence replica being supplied to the minimum mean square error filter and used for the equalization of the bandlimited signal;
• and
• a subtractor configured to subtract the received signal replica from the input signal.