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Hybrid Beamforming Design for ITS-Assisted Wireless Networks | IEEE Journals & Magazine | IEEE Xplore

Hybrid Beamforming Design for ITS-Assisted Wireless Networks


Abstract:

This letter proposes a hybrid beamforming design for an intelligent transmissive surface (ITS)-assisted transmitter wireless network. We aim to suppress the sidelobes and...Show More

Abstract:

This letter proposes a hybrid beamforming design for an intelligent transmissive surface (ITS)-assisted transmitter wireless network. We aim to suppress the sidelobes and optimize the mainlobes of the transmit beams by minimizing the proposed cost function based on the least squares (LS) for the digital beamforming vector of the base station (BS) and the phase shifts of the ITS. To solve the minimization problem, we adopt an efficient algorithm based on the alternating optimization (AO) method to design the digital beamforming vector and the phase shifts of the ITS in an alternating manner. In particular, the alternating direction method of multipliers (ADMM) algorithm is utilized to obtain the optimal phase shifts of the ITS. Finally, we verify the improvement achieved by the proposed algorithm in terms of the beam response compared to the benchmark schemes by the simulation results.
Published in: IEEE Wireless Communications Letters ( Volume: 12, Issue: 3, March 2023)
Page(s): 451 - 455
Date of Publication: 19 December 2022

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I. Introduction

Massive multiple-input multiple-output (MIMO) systems are one of the essential technologies for the beyond-fifth-generation (B5G) and six-generation (6G) wireless communications. However, a large number of radio frequency (RF) chains connected to active antennas in the conventional fully-digital transmitter will incur huge power consumption and high complexity, which has motivated the work on hybrid analog-digital beamforming structures [1], [2], [3], [4] to decrease the number of RF chains by moving some signal processing operations into the analogue domain. However, the undesired high sidelobes may be caused in these hybrid beamforming structures. Hence, to mitigate the adverse effect of the sidelobes in the transmit beam, different techniques were proposed in the hybrid beamforming architecture [5], [6], [7]. Nevertheless, the cost of the analog network in conventional hybrid beamforming structures is still high for the massive number of RF components, such as dividers, combiners, phase shifters and the connections between them, which calls for more effective and innovative solutions [8].

References

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