SFBC-MIMO系统碰撞信号恢复算法  

SFBC collision decoding algorithm for MIMO system

作　　者：胡琦[1] 杨峰[1] 丁良辉[1] 钱良[1] 

机构地区：[1]上海交通大学电子工程系,上海200240

出　　处：《信息技术》2015年第12期42-45,50,共5页Information Technology

基　　金：国家自然科学基金项目(61301117;61221001;6142010-6008);上海市数字媒体处理与传输重点实验室(12DZ22-72600);上海交通大学"科技创新专项资金"(AF0300021)

摘　　要：为了提升无线传输速率,空频编码(SFBC)以及多输入多输出-正交频分复用(MIMO-OFDM)技术被引入到无线局域网(WLAN)标准中,而在无线局域网中,由隐藏终端导致的信号碰撞问题会极大影响WLAN系统的通信性能。针对上述问题,提出了一种基于SFBC MIMO-OFDM系统的碰撞信号恢复算法(SCD-MIMO),该算法通过碰撞信号重构、接收信号求解和空频解码三个步骤对碰撞信号进行恢复。从仿真结果可以看出在信噪比为12时系统误码率仅为10-4,证明文中提出的算法能够有效解决SFBC MIMO-OFDM系统的信号碰撞问题。In order to enhance the wireless transmission rate, spaee-frequeney block code （SFBC） and multiple input multiple output-orthogonal frequency division multiplexing （MIMO-OFDM） technology is introduced to wireless local area network （WLAN） standard. But the signal collision caused by hidden terminal will greatly affect the performance of WLAN system. Aiming at the above problem, this paper proposes a SFBC collision decoding algorithm （SCD-MIMO） for MIMO-OFDM system, which recovers the signal from collided signal by three steps：first, collided signal reconstruction;second, received signal solving;third, space-frequency decoding. The simulation results illustrate show that the bit error rate （BER） of SCD-MIMO can reach 10-4in high SNR situation, which proves that the proposed algorithm can effectively solve the signal collision problem in SFBC MIMO-OFDM system.

关 键 词：空频编码 MIMO-OFDM系统 碰撞恢复 隐藏终端 

分 类 号：TN919.3[电子电信—通信与信息系统]