Interleaved time-frequency multiple access using OTFS modulation

Augustine, RM and Chockalingam, A (2019) Interleaved time-frequency multiple access using OTFS modulation. In: 90th IEEE Vehicular Technology Conference, VTC 2019 Fall, 22 - 25 September 2019, Honolulu.

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Abstract

In this paper, we consider a multiuser uplink scenario using orthogonal time frequency space (OTFS) modulation and propose a scheme for multiplexing users on an N × M time-frequency grid in which allocated time-frequency resource blocks for different users are non-contiguous and interleaved. The proposed scheme, termed as \em interleaved time-frequency multiple access (ITFMA), allows multiuser interference-free signal reception in the time-frequency domain thereby reduces the detection complexity. The proposed scheme is shown to achieve improved bit error performance compared to another recently proposed OTFS based multiple access scheme. We also consider the peak-to-average power ratio (PAPR) of the proposed scheme and analytically characterize its complementary cumulative distribution function for large values of N/q, where q denotes the interleaving period in time. The use of DFT precoding is shown to improve the PAPR of the proposed scheme. © 2019 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:	Distribution functions; Frequency domain analysis; Modulation, Complementary cumulative distribution functions; Doppler; Multi-user interference; Multiple access; Multiple access scheme; PAPR; Peak to average power ratio; Time frequency domain, Multiple access interference
Department/Centre:	Division of Electrical Sciences > Electrical Communication Engineering
Date Deposited:	07 Jan 2023 04:51
Last Modified:	07 Jan 2023 04:51
URI:	https://eprints.iisc.ac.in/id/eprint/78840

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