Optimum Joint Transmission （JT） Scheme in TD-SCDMA Downlink
摘要
TD-SCDMA has been decided as the standard for TDD mode of the 3 rd Generation mobile radio system by International Telecommunications Union (ITU), it is a important breakthrough in a century communication history. A novel downlink multiuser transmission scheme Joint Transmission (JT) is proposed based on the reciprocity that in the case of TDD the same channel impulse responses are valid for both the uplink and the downlink, it can enhance system performance and reduce system complexity. Because no channel estimation is necessary at the MSs, the data detection effort isdramatically reduced. This paper apply JT in Time Division CDMA (TD-SCDMA) and analyze its proformance in contrast to state of the art TD-CDMA transceivers. The computer simulation results illustrate the superiority of the novel scheme in terms of the system performance in the downlink of TD-SCDMA.