摘要
为了提高准正交空时分组码在多输入多输出衰落信道中的性能,文章结合随机旋转及预编码技术,提出了一种新的发射分集方案。通过随机旋转使得准正交空时分组码的符号间干扰随机化,接收端在进行均衡译码的同时,将信道信息反馈给发送端,发送端可以随之选择预编码矩阵,完成自适应编码。仿真结果表明,相对于未经过预编码矩阵的系统,新的发射方案能够有效地降低误码率,提高系统的性能。
Aim. The introduction of the full paper reviews some papers in the open literature, points out their main shortcomings and proposes what we believe to be a new and better design, which is explained in sections 1 through 3. Their core consists of： （ 1 ） to enhance the performance of QOSTBC in the MIMO fading channels, our new transmission design randomly rotates each information symbol vector; hence, the inter-symbol interference among multiple antennas is allocated more randomly ; （2） the receiver of the MIMO transmission system carries out equalized decoding and at the same time feeds back the channel information which includes channel-related information and mean values; then the transmitter chooses pre-coding matrixes and completes self-adaptive coding in accord- ance with the feedbacks. The simulation results, given in Figs. 2 and 3, and their analysis show preliminarily that our new design can greatly reduce the bit error rate （BER） of the transmission system and enhance its overall per-formance compared with the transmission systems without pre-coding.
出处
《西北工业大学学报》
EI
CAS
CSCD
北大核心
2011年第5期665-670,共6页
Journal of Northwestern Polytechnical University
基金
西北工业大学基础研究基金(FFR-NPU-JC201118)资助
关键词
空时分组码
预编码
随机旋转
准正交
analysis, antennas, bit error rate, codes （symbols）, communication, decoding, design, feedback, information technology, intersymbol interference, simulation, transmitters, pre-coding, random rota- tion, quasi-orthogonal space time block coding （QOSTBC）
