电讯技术
電訊技術
전신기술
TELECOMMUNICATIONS ENGINEERING
2015年
5期
479-483
,共5页
MIMO系统%信号检测%Gibbs采样%“失控问题”%最大似然检测%噪声方差
MIMO繫統%信號檢測%Gibbs採樣%“失控問題”%最大似然檢測%譟聲方差
MIMO계통%신호검측%Gibbs채양%“실공문제”%최대사연검측%조성방차
MIMO system%signal detection%Gibbs sampler%stalling problem%Maximum Likelihood detec-tion%noise variance
针对传统Gibbs采样算法的“失控问题”，提出了一种改进算法，在Gibbs迭代采样过程中加入对噪声方差的估计，消除了失控问题。设计了信号检测流程，将最大似然( ML)检测的搜索过程嵌入Gibbs迭代采样过程，减少了最大似然检测的计算步骤。仿真结果表明，所提算法能估计噪声方差，具有接近最大似然检测的性能。
針對傳統Gibbs採樣算法的“失控問題”，提齣瞭一種改進算法，在Gibbs迭代採樣過程中加入對譟聲方差的估計，消除瞭失控問題。設計瞭信號檢測流程，將最大似然( ML)檢測的搜索過程嵌入Gibbs迭代採樣過程，減少瞭最大似然檢測的計算步驟。倣真結果錶明，所提算法能估計譟聲方差，具有接近最大似然檢測的性能。
침대전통Gibbs채양산법적“실공문제”，제출료일충개진산법，재Gibbs질대채양과정중가입대조성방차적고계，소제료실공문제。설계료신호검측류정，장최대사연( ML)검측적수색과정감입Gibbs질대채양과정，감소료최대사연검측적계산보취。방진결과표명，소제산법능고계조성방차，구유접근최대사연검측적성능。
For preventing the stalling problem of Gibbs sampler,an improved algorithm is proposed. First-ly,the estimates of the noise variance is obtained from the Gibbs sampler,the stalling problem is elimina-ted. Then,by combining with Maximum Likelihood( ML) detection in the process of iteration of the Gibbs sampler,the complexity of signal detection is reduced. Simulation results show that the noise variance can be obtained with the proposed method,and the improved algorithm achieves the performance approaching the maximum likelihood detection.
