Terahertz-Band Ultra-Massive Spatial Modulation MIMO

The prospect of ultra-massive multiple-input multiple-output (UM-MIMO) technology to combat the distance problem at the Terahertz (THz) band is considered. It is well-known that the very large available bandwidths at THz frequencies come at the cost of severe propagation losses and power limitations...

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Bibliographic Details
Published in:IEEE journal on selected areas in communications 2019-09, Vol.37 (9), p.2040-2052
Main Authors: Sarieddeen, Hadi, Alouini, Mohamed-Slim, Al-Naffouri, Tareq Y.
Format: Article
Language:English
Subjects:
Antenna arrays
Array signal processing
arrays-of-subarrays
Beamforming
Bit error rate
Communication
Frequency modulation
Graphene
MIMO communication
Modulation
Multiplexing
Nanoantennas
Plasmons
spatial modulation
Terahertz frequencies
THz communications
ultra-massive MIMO
Very high frequencies
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Summary:The prospect of ultra-massive multiple-input multiple-output (UM-MIMO) technology to combat the distance problem at the Terahertz (THz) band is considered. It is well-known that the very large available bandwidths at THz frequencies come at the cost of severe propagation losses and power limitations, which result in very short communication distances. Recently, graphene-based plasmonic nano-antenna arrays that can accommodate hundreds of antenna elements in a few millimeters have been proposed. While such arrays enable efficient beamforming that can increase the communication range, they fail to provide sufficient spatial degrees of freedom for spatial multiplexing. In this paper, we examine spatial modulation (SM) techniques that can leverage the properties of densely packed configurable arrays of subarrays of nano-antennas, to increase capacity and spectral efficiency, while maintaining acceptable beamforming performance. Depending on the communication distance and the frequency of operation, a specific SM configuration that ensures good channel conditions is recommended. We analyze the performance of the proposed schemes theoretically and numerically in terms of symbol and bit error rates, where significant gains are observed compared to conventional SM. We demonstrate that SM at very high frequencies is a feasible paradigm, and we motivate several extensions that can make THz-band SM a future research trend.
ISSN:0733-8716
1558-0008
DOI:10.1109/JSAC.2019.2929455