基于STBC的MIMO-OFDM系统中自适应调制技术研究  

ADAPTIVE MODULATION WITH SPACE-TIME BLOCK CODING FOR MIMO-OFDM SYSTEMS

作　　者：张世超[1] 季仲梅[1] 崔维嘉[1] 

机构地区：[1]解放军信息工程大学信息工程学院,河南郑州450002

出　　处：《计算机应用与软件》2011年第10期69-71,158,共4页Computer Applications and Software

基　　金：国家高技术研究发展计划资助项目(2009AA011504)

摘　　要：将自适应比特、功率分配(ABPA)应用在基于空时分组编码(STBC)的MIMO-OFDM系统中,能够进一步提高无线链路的性能,而如何在载波间分配比特、功率是个关键问题。文章提出一种基于ABPA-STBC的MIMO-OFDM系统模型,即根据STBC-MI-MO-OFDM系统的特点,在此系统中采用优化目标为最小化误码率的Fischer算法引入自适应调制技术。仿真结果表明,所提出的系统模型和一般的MIMO-OFDM系统相比可获得更好的误码性能。Applying adaptive bit and power allocation（ABPA） into MIMO-OFDM system with Space-Time Block Coding（STBC） scheme has been proved to be able to further enhance the performance of wireless link system,but how to allocate bit and power among carriers becomes a key issue.In this paper,the authors propose a model that incorporates ABPA with STBC（called ABPA-STBC） for MIMO-OFDM systems,that is,based on the characteristic of STBC-MIMO-OFDM system,in this system the Fischer algorithm with its optimisation objective of minimised bit-error rate is adopted and the adaptive modulation technique is introduced.Simulation results demonstrate that the system model proposed in the paper can achieve better bit-error performance than that of general MIMO-OFDM system.

关 键 词：正交频分复用 多输入多输出 空时分组编码 自适应调制 

分 类 号：TP393.04[自动化与计算机技术—计算机应用技术]