Abstract:
In this paper, a novel dual-rate orthogonal time frequency space (OTFS) system resilient to oscillator frequency offset (OFO) and Doppler spread is presented for high-mob...Show MoreMetadata
Abstract:
In this paper, a novel dual-rate orthogonal time frequency space (OTFS) system resilient to oscillator frequency offset (OFO) and Doppler spread is presented for high-mobility communications. To the best of the authors' knowledge, this is the first work in OTFS which introduces dual-rate frame and addresses both OFO and Doppler spread. By multiplexing low-rate data blocks at the front and back of OTFS frame, OFO is estimated without requiring extra pilots. Thanks to subspace-based algorithm, OFO is estimated with high accuracy, and the residual small OFO can be jointly estimated with Doppler-spread channel by utilizing a few pilots, without deteriorating performance. Simulation results verify the superior performance of the proposed dual-rate system over existing single-rate systems, in terms of bit error rate (BER), mean-square-error (MSE) of OFO estimation, and MSE of equivalent channel estimation, while featuring lower pilot overhead and power. The BER of the proposed system also approaches its lower bound, which assumes perfect estimation of OFO and Doppler-spread channel.
Date of Conference: 28 May 2023 - 01 June 2023
Date Added to IEEE Xplore: 23 October 2023
ISBN Information:
Electronic ISSN: 1938-1883