Multiuser detection in large-dimension multicode MIMO-CDMA systems with higher-order modulation

Som, Pritam and Chockalingam, Ananthanarayanan (2011) Multiuser detection in large-dimension multicode MIMO-CDMA systems with higher-order modulation. In: 2011 - MILCOM 2011 Military Communications Conference, 7-10 Nov. 2011, Baltimore, MD.

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Abstract

In this paper, we are interested in high spectral efficiency multicode CDMA systems with large number of users employing single/multiple transmit antennas and higher-order modulation. In particular, we consider a local neighborhood search based multiuser detection algorithm which offers very good performance and complexity, suited for systems with large number of users employing M-QAM/M-PSK. We apply the algorithm on the chip matched filter output vector. We demonstrate near-single user (SU) performance of the algorithm in CDMA systems with large number of users using 4-QAM/16-QAM/64-QAM/8-PSK on AWGN, frequency-flat, and frequency-selective fading channels. We further show that the algorithm performs very well in multicode multiple-input multiple-output (MIMO) CDMA systems as well, outperforming other linear detectors and interference cancelers reported in the literature for such systems. The per-symbol complexity of the search algorithm is O(K2n2tn2cM), K: number of users, nt: number of transmit antennas at each user, nc: number of spreading codes multiplexed on each transmit antenna, M: modulation alphabet size, making the algorithm attractive for multiuser detection in large-dimension multicode MIMO-CDMA systems with M-QAM.

Item Type:	Conference Paper
Publisher:	IEEE
Additional Information:	Copyright of this article belongs to IEEE. USA.
Keywords:	DS-CDMA;Multicode MIMO;Higher-Order Modulation;Local Neighborhood Search;Near-Optimal Performance
Department/Centre:	Division of Electrical Sciences > Electrical Communication Engineering
Date Deposited:	27 Mar 2013 09:32
Last Modified:	27 Mar 2013 09:32
URI:	http://eprints.iisc.ac.in/id/eprint/46117

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