分层空时分组码结合OFDM系统在短波通信中的应用  

An Application of L-STBC-OFDM in HF Communications

作　　者：杨莘元[1] 杨杰[1] 蔚娜 

机构地区：[1]哈尔滨工程大学信息与通信工程学院,哈尔滨150001

出　　处：《宇航学报》2008年第6期1974-1978,共5页Journal of Astronautics

摘　　要：MIMO技术利用多副收发天线对信息进行发送与接收,在无需增加频谱资源和天线发送功率的情况下,可以利用MIMO信道提供的复用增益和分集增益提高信道传输的可靠性,降低误码率。对于短波信道,将MI-MO与OFDM有机结合,可以发挥两种技术各自的优点。MIMO各种编码方案中STBC抗衰落性能强,LSTC频谱利用率高,而两者的结合L-STBC是对两种编码方案性能的折中。本文将L-STBC与OFDM结合应用到短波通信中,所得系统抗衰落性能优于STBC-OFDM系统,传输性能优于LSTC-OFDM系统,因此在设计短波通信系统时,可以根据信道环境和要求来合理的选择通信系统方案。Multiple-input multiple-output （MIMO） is a promising technology to enhance capacity and robustness of the link by the presence of multiple transmit antennas and multiple receive antennas in the communication link. The use of multiple antennas at both ends of a wireless link promises significant improvements in terms of spectral efficiency and link reliability. The HF system adopted MIMO and OFDM（Orthogonal Frequency Division Multiplexing） will improve the quality of HF communications. Among coding approach in MIMO system, the ability of combating fading of STBC is better than that of LSTC, the spectrum and the code rate of LSTC is higher than that of STBC, L-STBC is a coding approach combining STBC and LSTC. In this paper, L-STBC-OFDM system scheme was proposed and simulation was done in HF channel. The result confirmed that the performance of combating fading of L-STBC-OFDM system is better than that of LSTC-OFDM system and the performance of transmitting is better than that of STBC-OFDM system.

关 键 词：正交频分复用 多输入多输出 空时分组码 分层空时码 分层空时分组码 

分 类 号：TN92[电子电信—通信与信息系统]