A generalized blind adaptive multi-user detection algorithm for multipath Rayleigh fading channel employed in a MIMO system

• Published in: Journal of communications and networks Vol. 8; no. 3; pp. 290 - 296
• Main Authors: Fahmy, Yasmine A., Mourad, Hebat-Allah M., Al-Hussaini, Emad K.
• Format: Journal Article
• Language: English
• Published: Séoul Editorial Department of Journal of Communications and Networks 01.09.2006; Korean Institute of Communication Sciences
• Subjects: Applied sciences; Blind adaptive techniques; Detectors; Exact sciences and technology; Fading; Information, signal and communications theory; Modulation, demodulation; multi-user detection; Multiaccess communication; multipath Rayleigh fading channel; multiple input multiple output (MIMO); Receiving antennas; Signal and communications theory; Systems, networks and services of telecommunications; Telecommunications; Telecommunications and information theory; Transmission and modulation (techniques and equipments); Transmitting antennas; Vectors; Fading channels; Performance evaluation; MIMO system; Multiple access; Adaptive algorithm; Wireless telecommunication; Rayleigh channels; multi-user detection; Blind adaptive techniques; Multipath channels; Mean square error; Phase shift keying; Direct detection; Signal interference; Intersymbol interference; Telecommunication system; Code division multiple access; multiple input multiple output (MIMO); Minimum energy; multipath Rayleigh fading channel; Timing; Direct sequence; Asynchronous transmission
• ISSN: 1229-2370; 1976-5541
• DOI: 10.1109/JCN.2006.6182768

In this paper, a generalized blind adaptive algorithm is introduced for multi-user detection of direct sequence code division multiple access (DS-CDMA) wireless communication systems. The main property of the proposed algorithm is its ability to resolve the multipath fading channel resulting in inter symbol interference (ISI) as well as multiple access interference (MAI). Other remarkable properties are its low complexity and mitigation to the near-far problem as well as its insensitivity to asynchronous transmission. The proposed system is based on the minimization of the output energy and convergence to the minimum mean square error (MMSE) detector. It is blind in the sense that it needs no knowledge of the other users' signatures, only the intended user signature and timing are required. Furthermore, the convergence of the minimum output energy (MOE) detector to the MMSE detector is analytically proven in case of M-ary PSK. Depicted results show that the performance of the generalized system dominates those previously considered. Further improvements are obtained when multiple input multiple output (MIMO) technique is employed.