A Novel Transmission Strategy for Hybrid RIS Aided Millimeter Wave OTFS Systems

• Published in: 2022 14th International Conference on Wireless Communications and Signal Processing (WCSP) pp. 1058 - 1063
• Main Authors: Li, Muye, Zhang, Shun, Ge, Yao, Gao, Feifei, Fan, Pingzhi
• Format: Conference Proceeding
• Language: English
• Published: IEEE 01.11.2022
• Subjects: Array signal processing; Channel estimation; Human-robot interaction; hybrid RIS; joint channel estimation and data detection; Message passing; OTFS; parameter extraction; Simulation; Symbols; Wireless communication
• DOI: 10.1109/WCSP55476.2022.10039313

This article focuses on the joint channel estimation and data detection (JCEDD) for hybrid reconfigurable intelligent surface (HRIS) aided millimeter wave OTFS systems. Firstly, a new transmission structure is designed. Within the pilot durations of the designed structure, partial HRIS elements are alternatively activated. The time domain channel model is then exhibited. Secondly, the received signal model for both the HRIS and the base station are studied. Thirdly, by utilizing channel parameters acquired at the HRIS, an HRIS beamforming design strategy is proposed. For the OTFS transmission, we propose a JCEDD scheme over delay-Doppler domain. In this scheme, message passing and expectation-maximization algorithm are iteratively executed to simultaneously acquire the channel and the unknown data symbols. Finally, simulation results are provided to validate the effectiveness of our proposed JCEDD scheme.