空时分组码多载波CDMA的系统性能分析

Analysis on the System Performance of the MC-CDMA Based on Space-time Block Coding

多载波CDMA(MC-CDMA)是一种把正交频分复用(OFDM)和CDMA结合起来的新一代移动通信系统。把时间和空间分集应用到MC-CDMA中,可以增加抗干扰能力,增加系统容量,并且易于解码和检测。提出了一种空时分组码MC-CDMA系统,使用两个发射天线和多个接收天线进行分集,在对此系统模型作详细阐述的基础上对其进行性能分析,利用其扩频码的自身特性消除了符号间的干扰,得出系统理论误码率,通过仿真对其与传统MC-CDMA方案作了比较,仿真结果说明了该系统的优越性。

MC-CDMA has been proposed as a criterion for the next communication system that combines the CDMA with the Orthogonal Frequency Division Multiplexing technique. Exploiting the time and space diversity into the MCCDMA system can increase the system＇s capability and the anti-interference ability, and the decoding and detection tend to be less complicated. A space-time block coded MC-CDMA system is proposed in this paper,two transmit antenna are applied to the mobile terminal and multiple antenna are applied to the receiver,the system performance is exquisitely analyzed based on the system model, the ISI is eliminated according to the characteristic of the spreading code, the system Bite Error Rate is got. The superiority of the space-time block coded MC-CDMA is proved via the simulation.