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Performance of Space-Code-Division Multiple-Access Systems Using Reduced-Rank Detection

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  • Communication


Performance of Space-Code-Division Multiple-Access Systems Using Reduced-Rank Detection Jiliang Zhang and Lie-Liang Yang School of ECS, University of Southampton, SO17 1BJ, UK Tel: +44-23-8059 3364; Fax: +44-23-8059 4508 E-mail: [email protected]; Abstract—In this contribution the performance of multiple- input multiple-output space-division, code-division multiple- access (MIMO SCDMA) is investigated, when the low-complexity reduced-rank detection is employed. In [1] a MIMO SCDMA sys- tem is proposed, aiming at improving the capacity of the existing direct-sequence (DS) CDMA (DS-CDMA) systems. The perfor- mance of the SCDMA system in [1] is investigated, when the full- rank multiuser detectors (MUDs) are considered. However, since the rank of the detection-related matrices in SCDMA is usually high, the complexity is extremely high, even linear detectors, such as decorrelating, minimum mean-square error (MMSE), etc. are employed. In this paper the reduced-rank detection scheme, which is derived based on the Taylor polynomial approximation (TPA), is proposed for detecting the SCDMA signal. The bit error rate (BER) performance of the MIMO SCDMA is investigated, when communicating over frequency-selective fading channels. It can be shown that the considered reduced-rank detection is capable of achieving a BER performance that is close to that of using full- rank detection, but with significantly lower detection complexity. I. INTRODUCTION In wireless communications DS-CDMA has been a typical multiple-access scheme in the second and third generations of wireless communications systems. Without any doubt, it will constitute an important candidate in the future generations of wireless communications systems. Hence, one of the important issues in future wireless communications is to increase the capacity of DS-CDMA networks. In [1] a MIMO SCDMA scheme is proposed and investigated, where multiple transmit and receive antennas are introduced in order to enhance

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