一种新的网格空时码  

A new space-time trellis code

作　　者：郭漪[1] 刘刚[1] 葛建华[1] 

机构地区：[1]西安电子科技大学综合业务网国家重点实验室,陕西西安710071

出　　处：《电路与系统学报》2008年第4期149-152,共4页Journal of Circuits and Systems

基　　金："863"计划课题资助(2003AA123320);国家自然科学基金资助(60332030);国家自然科学基金重大项目资助(60496316)

摘　　要：本文分析了空时码在平坦准静态衰落信道下的性能,指出分集增益和编码增益并不能准确衡量空时码的性能,提出一种设计网格空时码的新思路,即通过牺牲部分分集增益来降低调制阶数以提高系统性能。依据这一思想,本文给出一种传输速率为3bits/s/Hz,4-PSK调制,8状态的新的非满秩网格空时码。仿真结果表明,这种码虽然没有获得最大分集增益,但相比同速率的满秩网格空时码性能更好,实现更简单。The performance of space-time codes in quasi-static fading channels is analyzed, and the result shows that the diversity gain and the coding gain are not exact measures of the performance of space-time codes. Based on the fact, we choose a new strategy in designing space-time trellis code （STTC） and propose an STTC which has better performance by sacrificing the full diversity to reduce the oi＇der of modulation. The simulation results show that compared with the full rank space-time trellis code with a same transmission rate, the STTC proposed has better performance and lower realization complexity although it provides partial diversity.

关 键 词：非满秩网格空时码 满秩网格空时码 分集 无线通信 

分 类 号：TN911.22[电子电信—通信与信息系统]