摘要
STC-OFDM系统有效弥补了正交频分复用多址系统中符号间干扰和频率选择性衰落等不足,但存在如何有效抑制因多天线传输产生的相互干扰问题。为此,提出了一种结合信道频率响应恢复和串行干扰消除来抑制干扰的改进算法,该算法在串行干扰消除之前先对导频进行信道频率响应恢复,减小估计对信道频率响应的影响。仿真实验表明,该算法能进一步改善STC-OFDM系统比特误码率并进而抑制相互干扰。
STC-OFDM systems effectively overcomes the disadvantage of inter symbol interference and frequency selective fading for orthogonal frequency division multiplexing communication systems, however, there are still some issues on how to suppres- sing mutual interference due to multi-antenna transmitting. An improving algorithm combining with channel frequency response recovery is proposed, which recovery the channel frequency response of the pilot before successive interference cancellation and decrease the influence on the channel frequency response of estimation. Theoretical analysis and computer simulation shows that the proposal algorithm can improve performance of bit error rate and suppress for STC-OFDM communication systems.
出处
《计算机工程与设计》
CSCD
北大核心
2012年第6期2281-2285,共5页
Computer Engineering and Design
基金
重庆市自然科学基金项目(CSTCjjA40014)
教育部"春晖计划"合作科研项目(Z2009-1-63017)
关键词
移动通信
正交频分复用
空时编码
信道频率响应恢复
串行干扰消除
mobile communications
OFDM
space-time coding
channel frequency response recovery
successive interference cancellation
