摘要
针对在发射端和接收端都存在空间相关的频率选择性时变MIMO信道,分析了MIMO-OFDM系统中的空时频码的分集度性能,基于成对错误概率准则,推广了空时频码的设计准则.对于一个给定的空时频码,发现所能获得的分集度不仅与发射端相关矩阵、接收端相关矩阵有关,而且还与信道的时间相关矩阵、频率相关矩阵有关.空时频码在相关信道下的最大可获得分集度为Lrank(P)rank(Q)rank(RT).空时码和空频码只是该结果的一个特例.实验仿真结果验证了该结论.
For the frequency selective and time variant MIMO （ multiple-input multiple-output） channel model taking into account transmit and receive antenna correlation, the diversity of space-timefrequency coded broadband MIMO-OFDM （orthogonal frequency-division multiplexing） systems is analyzed. Based on the average pairwise error probability（ PEP）, the design criterion of space-timefrequency code（STFC） is expanded. For a given STFC, the conclusion is made that the achievable diversity order is not only the function of the transmitter and the receiver correlation matrix but also the function of the time correlation and frequency correlation matrix. The maximum available diversity of STFC over correlation channel is Lrank （P） rank （Q） rank （ RT ）. The space-time code and space-frequency code are the special cases in our approach. Simulation results have demonstrated our conclusion.
出处
《东南大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2007年第4期549-553,共5页
Journal of Southeast University：Natural Science Edition
基金
国家自然科学基金资助项目(60672093)
国家自然科学基金重大资助项目(60496310)
江苏省自然科学基金资助项目(BK2005061)
关键词
分集
多输入多输出
正交频分复用
成对错误概率
空时频码
diversity
multiple-input multiple-output
orthogonal frequency-division multiplexing
pairwise error probability
space-time-frequency coding
