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A Low-Complexity Detector for Large MIMO Systems and Multicarrier CDMA Systems

Vardhan, Vishnu K and Mohammed, Saif K and Chockalingam, A and Rajan, Sundar B (2008) A Low-Complexity Detector for Large MIMO Systems and Multicarrier CDMA Systems. In: IEEE Journal on Selected Areas in Communications, 26 (3). pp. 473-485.

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We consider large MIMO systems, where by ‘large’ we mean number of transmit and receive antennas of the order of tens to hundreds. Such large MIMO systems will be of immense interest because of the very high spectral efficiencies possible in such systems. We present a low-complexity detector which achieves uncoded near-exponential diversity performance for hundreds of antennas (i.e., achieves near SISO AWGN performance in a large MIMO fading environment) with an average perbit complexity of just $O(N_tN_r)$, where $N_t$ and $N_r$ denote the number of transmit and receive antennas, respectively. With an outer turbo code, the proposed detector achieves good coded bit error performance as well. For example, in a 600 transmit and 600 receive antennas V-BLAST system with a high spectral efficiency of 450 bps/Hz (using BPSK and rate-3/4 turbo code), our simulation results show that the proposed detector performs to within about 7 dB from capacity. This practical feasibility of the proposed high-performance, low-complexity detector could potentially trigger wide interest n the theory and implementation f large MIMO systems. We lso illustrate the applicability of the proposed detector in the low-complexity detection of high-rate, non-orthogonal space-time block codes and large multicarrier CDMA (MC-CDMA) systems. In large MC-CDMA systems with hundreds of users, the proposed detector is shown to achieve near single-user performance at an average per-bit complexity linear in number of users, which is quite appealing for its use in practical CDMA systems.

Item Type: Journal Article
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Additional Information: ©2008 IEEE. Personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution to servers or lists, or to reuse any copyrighted component of this work in other works must be obtained from the IEEE.
Keywords: Large MIMO systems;V-BLAST;lowcomplexity detection;near-exponential diversity;high spectral. efficiency, space-time block codes, multicarrier CDMA.
Department/Centre: Division of Electrical Sciences > Electrical Communication Engineering
Date Deposited: 05 May 2008
Last Modified: 19 Sep 2010 04:44
URI: http://eprints.iisc.ernet.in/id/eprint/13811

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