Blind Space-Time Interference Suppression
for MC-CDMA System
Hu Bing①②; Li Ping-an③; Yu Bian-zhang①
①School of Electronic Information, Northwestern Polytechnical University, Xi’an 710072, China; ②System & Standard Dept. Datang Mobile Telecommunications Equipment CO., Ltd, Beijing 100083, China; ③School of Information Enginnering, Wuhan University of Technology, Wuhan 430070, China
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.
2006, Vol. 28 
