Investigations on QRD-M based broadband VP technique for multiuser multiantenna system

This paper investigates on practical broadband vector perturbation (VP) method with quick wide-area search based on QRD-M algorithm for the data transmission under frequency selective propagation channel. Simultaneously, the possibility of broadband VP using channel inversion with regularization factor has been considered. The feature of the system is in time-domain processing using spatio-temporal weight. Because of the necessity of eliminating undesired signal contained in delayed waves, the perturbation can be applied only to the present signal, which brings difficulty not encountered in the narrowband case. Through computer simulations, the effectiveness and problems of the above methods are discussed; particularly, it is verified that VP with regularization factor does not have advantage.