摘要
设计了一种基于导频辅助的无循环前缀空频分组编码-OFDM系统(Non-CPSFBC-OFDM)。区别于传统的循环前缀空时分组编码-OFDM系统(CPSTBC-OFDM),新系统发射端将块状导频序列和由空频分组编码构成的OFDM符号交替排布发射,并且每个OFDM符号前不再附加循环前缀,而接收端针对这一新的数据发射结构设计出一种基于干扰抵消的信号检测和信道估计联合递归算法。理论推导和仿真结果表明:相对于应用最小平方(LS)、迭代最小平方(iterative LS)的信道估计算法的循环前缀STBC-OFDM系统,引入联合递归算法的新系统可以得到更高的信息数据传输效率和更低的系统误比特率。
A pilot-assisted non-cyclic prefixed space-frequency block-coded orthogonal frequency division multiplexing （Non-CP SFBC-OFDM） system was proposed. Unlike in the traditional cyclic prefixed SFBC-OFDM system, the transmitted sequence of the proposed system was designed in the way that block-type pilot sequences and OFDM symbols derived from the SFBC scheme had been arranged alternately without any cyclic prefix （CP） before each OFDM symbol. Moreover, based on interference cancellation, a recursive algorithm of joint channel estimation and data detection was proposed for the corresponding receivers. Simulation results show that the proposed system based on the recursive algorithm achieves lower bit error rate （BER） and higher information data transmission rate than the traditional cyclic prefixed STBC-OFDM system with least square （LS） or iterative LS channel estimation algorithm.
出处
《通信学报》
EI
CSCD
北大核心
2009年第5期68-73,共6页
Journal on Communications
基金
国家高技术研究发展计划("863"计划)基金资助项目(2008AA01Z226)~~
