Performance Analysis of OTFS Modulation with Transmit Antenna Selection

Bhat, VS and Chockalingam, A (2021) Performance Analysis of OTFS Modulation with Transmit Antenna Selection. In: 93rd IEEE Vehicular Technology Conference, VTC 2021-Spring, 25-28 Apr 2021.

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Abstract

In this paper, we consider transmit antenna selection (TAS) in orthogonal time frequency space (OTFS) modulation and analyze its performance. We assume that the channel is quasi-static in the delay-Doppler (DD) domain and there is limited feedback from the receiver to the transmitter. The diversity performance of TAS is analyzed in a multiple-input multiple-output OTFS (MIMO-OTFS) system. Antenna selection is done based on the maximum channel Frobenius norm in the DD domain, where ns antennas are selected out of nt transmit antennas. Our analysis for one resolvable path in the DD channel (i.e., P = 1) shows that i) when ns = 1, full spatial diversity of nrnt (i.e., full receive diversity of nr and full transmit diversity of nt) is achieved since the underlying symbol difference matrix is full rank, and ii) when ns > 1, only nrth order receive diversity is achieved because of rank deficiency. Simulation results are shown to validate the analytically predicted diversity performance. For P > 1, diversity orders are predicted through rank of the difference matrices, validated through computation of pairwise error probability (PEP) bounds and simulations. © 2021 IEEE.

Item Type:	Conference Paper
Publication:	IEEE Vehicular Technology Conference
Publisher:	Institute of Electrical and Electronics Engineers Inc.
Additional Information:	The copyright for this article belongs to Institute of Electrical and Electronics Engineers Inc.
Keywords:	Block codes; MIMO systems; Modulation; Trellis codes, Difference matrix; Diversity performance; Pair-wise error probability; Performance analysis; Spatial diversity; Time-frequency space; Transmit antenna selection; Transmit diversity, Antennas
Department/Centre:	Division of Electrical Sciences > Electrical Communication Engineering
Date Deposited:	20 Nov 2021 12:40
Last Modified:	20 Nov 2021 12:40
URI:	http://eprints.iisc.ac.in/id/eprint/69908

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