一种TD-SCDMA上行链路发送和接收方案

为了在TD-SCDMA上行链路传输中获得更高的频谱利用率，提出了一种上行链路的发送和接收方案。发送端采用准同步CDMA加QAM调制，扩频序列采用优选相位的Gold序列，该序列在一定时延范围内具有良好的互相关性。接收端采用串行干扰抵消的方法去除或抑制很严重的多用户干扰，该方法实现简单，适合瑞利衰落信道。仿真结果说明采用这种发送和接收方案后，在应用智能天线抑制多径后，只要用户间的时延控制在3／8个chip之内，误符号率(SER)性能就几乎与单用户界(SUB)一致，频谱利用率可以达到4 bit／s／Hz。

A Scheme to Transmitter and Receiver for Uplink in TD-SCDMA

To improve the spectral efficiency for uplink data transmissions in TD-SCDMA, the authors propose a scheme to transmitter and receiver for uplink. In the transmitter, qausi-synchronous CDMA and QAM is employed, and a set of preferentially phased Gold sequences, which have good cross-correlations around the origin, are used as the spreading sequences. In the receiver, successive interference cancellation is employed to remove or suppress sever multiuser interference, and this detector is easy to implement and apt to Rayleigh fading channel. The simulation results show that if smart antenna is utilized to suppress multipath and the synchronization error between users is limited in 3/8 chip period, the symbol error rate (SER) performance approaches single user bound (SUB) and spectral efficiency amounts to 4bit/s/Hz, after the proposed scheme is applied.