Large-Scale Multiuser SM-MIMO Versus Massive MIMO

Narasimhan, Lakshmi T and Raviteja, P and Chockalingam, A (2015) Large-Scale Multiuser SM-MIMO Versus Massive MIMO. In: Information Theory and Applications Workshop (ITA), FEB 09-14, 2014, San Diego, CA, pp. 268-276.

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Abstract

Spatial modulation (SM) is attractive for multiantenna wireless communications. SM uses multiple transmit antenna elements but only one transmit radio frequency (RF) chain. In SM, in addition to the information bits conveyed through conventional modulation symbols (e.g., QAM), the index of the active transmit antenna also conveys information bits. In this paper, we establish that SM has significant signal-to-noise (SNR) advantage over conventional modulation in large-scale multiuser (multiple-input multiple-output) MIMO systems. Our new contribution in this paper addresses the key issue of large-dimension signal processing at the base station (BS) receiver (e.g., signal detection) in large-scale multiuser SM-MIMO systems, where each user is equipped with multiple transmit antennas (e.g., 2 or 4 antennas) but only one transmit RF chain, and the BS is equipped with tens to hundreds of (e.g., 128) receive antennas. Specifically, we propose two novel algorithms for detection of large-scale SM-MIMO signals at the BS; one is based on message passing and the other is based on local search. The proposed algorithms achieve very good performance and scale well. For the same spectral efficiency, multiuser SM-MIMO outperforms conventional multiuser MIMO (recently being referred to as massive MIMO) by several dBs. The SNR advantage of SM-MIMO over massive MIMO can be attributed to: (i) because of the spatial index bits, SM-MIMO can use a lower-order QAM alphabet compared to that in massive MIMO to achieve the same spectral efficiency, and (ii) for the same spectral efficiency and QAM size, massive MIMO will need more spatial streams per user which leads to increased spatial interference.

Item Type:	Conference Proceedings
Publisher:	IEEE
Additional Information:	Information Theory and Applications Workshop (ITA), San Diego, CA, FEB 09-14, 2014
Keywords:	Large-scale MIMO systems; spatial modulation; SM-MIMO; massive MIMO; message passing; local search
Department/Centre:	Division of Electrical Sciences > Electrical Communication Engineering
Date Deposited:	29 Apr 2015 05:39
Last Modified:	29 Apr 2015 05:39
URI:	http://eprints.iisc.ac.in/id/eprint/51458

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