级联LDPC码的分层空时编码研究  

Research for Joint Encoding of Bell Labs Layered Space-Time Code and LDPC Code

作　　者：张娜 何建强 王园园 ZHANG Na;HE Jian-qiang;WANG Yuan-yuan(School of Electronic Information and Electrical Engineering,Shangluo University,Shangluo 726000,Shaanxi)

机构地区：[1]商洛学院电子信息与电气工程学院,陕西商洛726000

出　　处：《商洛学院学报》2018年第2期80-84,共5页Journal of Shangluo University

基　　金：商洛学院科研基金项目(15SKY008)

摘　　要：在MIMO技术中分层空时编码(BLAST)能获得信道容量较大,且随发送天线数的增加其频带利用率呈线性增加。由于大气衰减、光强闪烁等因素的影响,使得BLAST系统在传输时系统误码率增高,不能满足未来移动通信系统安全可靠通信的要求,因此将LDPC码与分层空时码级联来解决这一问题,构成LDPC-BLAST系统,并采用BP译码算法使系统性能达到最佳化。实验结果表明:级联LDPC码的分层空时码能抑制大气湍流效应,使系统误码率降低,从而提高通信系统的性能。Bell Labs Layered Space-time(BLAST)codes can obtain large MIMO channel capacity,the bandwidth efficiency increases linearly with increase of the number of transmit antennas.The system transmitted will be subjected to atmospheric attenuation and scintillation and background radiation effect in the atmosphere,make the wireless laser communication system can't meet requirement of safe and reliable due to the bit error rate(BER)increased,In order to solve this problem,joint encoding of BLAST Code and LDPC code to form LDPC-BLAST system and use BP decoding to achieve the best performance.The results show that bit error rate(BER)reduced significantly and atmospheric turbulence suppressed with LDPC-BLAST structure,and thus improve the performance of the communication system.

关 键 词：MIMO BLAST编码 LDPC码 LDPC-BLAST系统 

分 类 号：TN919.31[电子电信—通信与信息系统]