MC-CDMA系統(tǒng)盲空時干擾抑制
Blind Space-Time Interference Suppression for MC-CDMA System
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摘要: 該文研究在頻率選擇性瑞利衰落信道中MC-CDMA系統(tǒng)的盲空時干擾抑制?？紤]對應于子載波的衰落系數(shù)是信道沖激響應的離散傅里葉變換，通過研究多徑信號頻域碼空間和數(shù)據(jù)矢量空間，采用噪聲子空間技術進行盲信道估計。為了抑制多址干擾(MAI)，提出一種基于投影的輔助矢量(PAV)算法，用前一級濾波矢量的輸出重構最大比合并(MRC)濾波矢量，將重構濾波矢量投射到由基本濾波矢量和前幾級輔助矢量張成子空間上的正交投影作為輔助矢量，將前一級濾波矢量和新產(chǎn)生輔助矢量線性合并得到新的濾波矢量。仿真結果驗證了該算法的有效性。Abstract: This paper investigates blind space-time interference suppression for MultiCarrier CDMA (MC-CDMA) system in frequency selective Rayleigh fading channel. It is considered that the fading coefficients corresponding to subcarriers are discrete Fourier transform of multipath coefficients. By investigating the code space in frequency domain and the data vector space of the multipath signals, the noise-subspace-based approach is used to perform blind channel estimation. To suppress multiuser access interference (MAI), a Projection-based Auxiliary Vector (PAV) algorithm is proposed. A reconstructed Maximum Ratio Combining (MRC) filtering vector can be evaluated by using the outputs of the last filtering vector. Taking the orthogonal projection of the reconstructed filtering vector onto the space spanned by the basic filtering vector and the previously derived auxiliary vector as an auxiliary vector, a new filtering vector can be formed by linearly combining the last filtering vector and newly generated auxiliary vector. Simulation results show the effectiveness of the proposed algorithms.
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