Yao Yi-jia, Zhu Shi-hua, Hu Gang, Zhang Fang. Blind Space-Time Multi-user Detection Based on Interfering Subspace Projection in MIMO-CDMA Systems[J]. Journal of Electronics & Information Technology, 2007, 29(9): 2195-2198. doi: 10.3724/SP.J.1146.2006.00039
Citation:
Yao Yi-jia, Zhu Shi-hua, Hu Gang, Zhang Fang. Blind Space-Time Multi-user Detection Based on Interfering Subspace Projection in MIMO-CDMA Systems[J]. Journal of Electronics & Information Technology, 2007, 29(9): 2195-2198. doi: 10.3724/SP.J.1146.2006.00039
Yao Yi-jia, Zhu Shi-hua, Hu Gang, Zhang Fang. Blind Space-Time Multi-user Detection Based on Interfering Subspace Projection in MIMO-CDMA Systems[J]. Journal of Electronics & Information Technology, 2007, 29(9): 2195-2198. doi: 10.3724/SP.J.1146.2006.00039
Citation:
Yao Yi-jia, Zhu Shi-hua, Hu Gang, Zhang Fang. Blind Space-Time Multi-user Detection Based on Interfering Subspace Projection in MIMO-CDMA Systems[J]. Journal of Electronics & Information Technology, 2007, 29(9): 2195-2198. doi: 10.3724/SP.J.1146.2006.00039
A blind space-time Multi-User Detection (MUD) algorithm is proposed for multi-antenna Code Division Multiple Access (CDMA) systems. The proposed algorithm exploits the signal structures in both time domain and spatial domain for interference rejection. Specifically, the proposed algorithm integrates Space-Time Coding (STC) with channel estimation by using the structural features of both Alamouti STC and the Multiple Input Multiple Output (MIMO) channel. The Multiple Access Interference (MAI) is suppressed by projecting the received signal onto the orthogonal complement of the estimated interference subspace. Furthermore, the proposed algorithm can adaptively trace the variation of the wireless channels with low complexity. Simulation results show that the algorithm can effectively suppress the MAI of space-time CDMA systems and significantly improve the system performance.
Honig M, Madhow U, and Verdu S. Blind adaptive multiuser detection [J].IEEE Trans. on Information Theory.1995, 41(4):944-960[2]Gesbert D, Shafi M, Shiu D, Smith P, and Naguib A. From theory to practice: an overview of MIMO space-time coded wireless systems [J].IEEE J. Select Areas Commun.2003, 21(3):281-302[3]Papadias C B and Huang H. Linear space-time multiuser detection for multipath CDMA channels [J]. IEEE J. Select Areas Commun., 2001, 21(2): 254-265.[4]Welburn L, Cavers J K, and Sowerby K W. A computational paradigm for space-time multiuser detection [J].IEEE Trans. on Commun.2004, 52(9):1595-1604[5]Sfar S, Murch R D, and Letaief K B. Layered space-time multiuser detection over wireless uplink systems [J]. IEEE Trans. on Wireless Commun., 2003, 2(4): 653-668.[6]Reynolds D, Wang X D, and Poor H V. Blind adaptive space-time multiuser detection with multiple transmitter and receiver antennas [J].IEEE Trans. on Signal Processing.2002, 50(6):1261-1276[7]Alamouti S M. A simple transmit diversity technique for wireless communication [J].IEEE J. Select Areas Commun.1998, 16(8):1451-1458[8]杜建煊. 直扩码分多址系统中的盲多用户检测研究[D]. [硕士论文], 西安:西安交通大学, 2001.[9]Yang Bin. Projection approximation subspace tracking [J].IEEE Trans. on Signal Processing.1995, 43(1):95-107[10]Bensley S E and Aazhang B. Subspace-based channel estimation for code division multiple access communication systems [J].IEEE. Trans. on Commun.1996, 44(8):1009-