Low-Complexity Transmission for Sphere RIS-Assisted MIMO Wireless Communications

Le résumé fourni par la source

Reconfigurable intelligent surface (RIS) has attracted much attention to assist millimeter-wave (mmWave) multiple-input-multiple-output (MIMO) wireless communications over line-of-sight (LOS) channels for performance improvement due to low hardware cost and low power consumption. The uniform circular array (UCA) is an effective antenna structure with low-complexity transceivers for RIS-assisted mmWave MIMO wireless communications where the transceivers are aligned. However, it is difficult to achieve strict alignment between the transceivers in practice. To address the challenges, in this paper we investigate the UCA based sphere RIS-assisted mmWave MIMO wireless communications with misaligned transceivers and sphere RIS. The channel model is investigated for the UCA based sphere RIS-assisted mmWave MIMO wireless communications. Furthermore, a precoding scheme at the transmitter, a phase compensation scheme at the sphere RIS, and a predecoding scheme at the receiver, which can convert the channel matrix into an equivalent circulant matrix, are developed. Then, our proposed fast symbol-wise maximum likelihood (ML) detection scheme can recover the signals with low complexity. Simulation results are presented to illustrate the theory for the UCA based sphere RIS-assisted mmWave MIMO wireless communications.

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