NDLI: Large-scale multiuser SM-MIMO versus massive MIMO

Content Provider	IEEE Xplore Digital Library
Author	Narasimhan, T.L. Raviteja, P. Chockalingam, A.
Copyright Year	2014
Description	Author affiliation: Dept. of Electr. & Commun. Eng., Indian Inst. of Sci., Bangalore, India (Narasimhan, T.L.; Raviteja, P.; Chockalingam, A.)
Abstract	Spatial modulation (SM) is attractive for multi-antenna 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.
Starting Page	1
Ending Page	9
File Size	292304
Page Count	9
File Format	PDF
ISBN	9781479935895
DOI	10.1109/ITA.2014.6804246
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2014-02-09
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Radio frequency spatial modulation message passing Quadrature amplitude modulation Large-scale MIMO systems Transmitting antennas Receiving antennas massive MIMO SM-MIMO MIMO Vectors local search
Content Type	Text
Resource Type	Article

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