MULTI-USER MULTIPLE INPUT MULTIPLE OUTPUT RADIO COMMUNICATIONS

摘要

A radio base station and method are provided for use in a radio communications system that conducts radio communications over a radio interface using basic physical channels. Each basic physical channel defines a time slot and a radio frequency for transmission. Radio communication is established between a radio base station and multiple user equipments (UEs) over the same basic physical channel. Subchannels are provided in the same basic physical channel to simultaneously support three or four full rate UE communications, seven or eight half rate UE communications, or other combinations. A first baseband transmitter chain is configured so that it can map full rate data corresponding to first and second full rate UE communications (or equivalent) as adaptive quadrature phase shift keying, AQPSK. A second baseband transmitter chain is configured so that it can map full rate data corresponding to a third and/or fourth full rate UE communication (or equivalent) as phase shifted signals onto a third of the three subchannels.