WCDMA系统HSDPA中一种新的STTD解调方法

In this paper,we investigate how to enhance the performance of a space-time transmit diversity(STTD) scheme using the Alamouti code for the High-Speed Downlink Packet Access(HSDPA) provision of WCDMA. In order to improve the downlink bit rate in physical layer,extremely low spreading factor is applied in WCDMA.Considering that the interference spectrum is distorted,conventional STTD demodulation will not meet the requirements of performance for the systems. Therefore, a new type of STTD demodulator for G-Rake receiver which could effectively suppress multi-path interference is introduced. In the end, the performance of demodulation algorithm for G-Rake receiver is simulated on VS2008 platform. It shows that the new demodulator for generalized Rake receiver is superior to the conventional STTD demodulation.