电讯技术
電訊技術
전신기술
TELECOMMUNICATIONS ENGINEERING
2014年
6期
791-795
,共5页
多用户检测%独立分量分析%FastICA算法%串行干扰抵消%算法复杂度
多用戶檢測%獨立分量分析%FastICA算法%串行榦擾牴消%算法複雜度
다용호검측%독립분량분석%FastICA산법%천행간우저소%산법복잡도
multiuser detection%ICA%FastICA algorithm%successive interference cancellation%computation complexity
为了降低FastICA算法的计算复杂度,提出了一种基于多用户检测串行干扰抵消的新型独立分量分析算法MUD_FastICA。该算法结合了盲信号分离和多用户检测串行干扰抵消两种信号处理技术,利用减法和低维特征值分解来保证每次分离出不同独立分量和达到降低算法复杂度的目的。通过分析和仿真可以看出,所提算法在不影响分离性能的前提下,显著降低了算法的迭代次数和每次迭代的计算复杂度。在信噪比0 dB和4个源信号混合情况下,分离第二个信号的迭代次数和所需计算单元分别下降了14%和37%,分离第三个信号的迭代次数和所需计算单元分别下降了22%和58%,因此更加适合对实时性要求高的通信系统。
為瞭降低FastICA算法的計算複雜度,提齣瞭一種基于多用戶檢測串行榦擾牴消的新型獨立分量分析算法MUD_FastICA。該算法結閤瞭盲信號分離和多用戶檢測串行榦擾牴消兩種信號處理技術,利用減法和低維特徵值分解來保證每次分離齣不同獨立分量和達到降低算法複雜度的目的。通過分析和倣真可以看齣,所提算法在不影響分離性能的前提下,顯著降低瞭算法的迭代次數和每次迭代的計算複雜度。在信譟比0 dB和4箇源信號混閤情況下,分離第二箇信號的迭代次數和所需計算單元分彆下降瞭14%和37%,分離第三箇信號的迭代次數和所需計算單元分彆下降瞭22%和58%,因此更加適閤對實時性要求高的通信繫統。
위료강저FastICA산법적계산복잡도,제출료일충기우다용호검측천행간우저소적신형독립분량분석산법MUD_FastICA。해산법결합료맹신호분리화다용호검측천행간우저소량충신호처리기술,이용감법화저유특정치분해래보증매차분리출불동독립분량화체도강저산법복잡도적목적。통과분석화방진가이간출,소제산법재불영향분리성능적전제하,현저강저료산법적질대차수화매차질대적계산복잡도。재신조비0 dB화4개원신호혼합정황하,분리제이개신호적질대차수화소수계산단원분별하강료14%화37%,분리제삼개신호적질대차수화소수계산단원분별하강료22%화58%,인차경가괄합대실시성요구고적통신계통。
A new independent component analysis ( ICA) method named MUD_FastICA is proposed to re-duce the computation complexity of FastICA algorithm. In the proposed method, multiuser detection (MUD) successive interference cancellation(MUD-SIC) is combined with one-unit FastICA to separate different independent components and reduce computation complexity. Analysis and simulation results show that, the MUD_FastICA can reduce the number of iteration and computation complexity obviously. Mean-while,the separation performance is approximately the same with that of traditional FastICA. In the case of 0 dB SNR and four source signals, number of iterations and computing units to separate the second ( third) signal are decreased by 14% (22%) and 37% (58%) respectively. Hence, it is more suitable for real-time communication system.