Delay-Doppler Domain Channel Estimation for DZT-Based OTFS Systems

Muppaneni, SP and Rao Mattu, S and Chockalingam, A (2023) Delay-Doppler Domain Channel Estimation for DZT-Based OTFS Systems. In: 24th IEEE International Workshop on Signal Processing Advances in Wireless Communications, SPAWC 2023, 25 - 28 September 2023, Shanghai, pp. 236-240.

PDF Iee_work_sig_pro_adv_wir_com_spa_2023.pdf - Published Version Restricted to Registered users only Download (1MB) | Request a copy

Abstract

Traditionally, orthogonal time frequency space (OTFS) modulation has been realized using a two-step approach where the information symbols mounted in the delay-Doppler (DD) domain are first converted to time-frequency (TF) domain and then to time domain for transmission. Recently, a low-complexity approach to OTFS has been proposed using discrete Zak transform (DZT), wherein information symbols in the DD domain are directly converted to time domain for transmission. In this paper, we consider the problem of DD domain channel estimation for DZT-based OTFS systems in fractional DD channels. Towards this, we propose a low-complexity iterative algorithm which carries out estimation of the DD domain channel parameters on a path-by-path basis. For each path, the algorithm first obtains an estimate of the integer part of delay and Doppler, and then estimates the fractional part where, instead of performing a brute-force search, the algorithm iteratively increases the DD resolution till a stopping criterion is reached. Our simulation results show that the proposed algorithm achieves good normalized mean square error performance and that the bit error performance achieved using the proposed estimation algorithm is close to that with perfect channel knowledge. © 2023 IEEE.

Item Type:	Conference Paper
Publication:	IEEE Workshop on Signal Processing Advances in Wireless Communications, SPAWC
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:	Computational complexity; Iterative methods; Mean square error, Delay-dopple domain; Discrete zak transform; Doppler; Fractional delay; Fractional delay-dopple; Information symbol; Orthogonal time frequency space modulation; Space systems; Time-frequency space, Channel estimation
Department/Centre:	Division of Electrical Sciences > Electrical Communication Engineering
Date Deposited:	01 Mar 2024 05:29
Last Modified:	01 Mar 2024 05:29
URI:	https://eprints.iisc.ac.in/id/eprint/83782

Actions (login required)

View Item