Environment-Aware Codebook for RIS-Assisted MU-MISO Communications: Implementation and Performance Analysis
arxiv(2024)
摘要
Reconfigurable intelligent surface (RIS) provides a new electromagnetic
response control solution, which can reshape the characteristics of wireless
channels. In this paper, we propose a novel environment-aware codebook protocol
for RIS-assisted multi-user multiple-input single-output (MU-MISO) systems.
Specifically, we first introduce a channel training protocol which consists of
off-line and on-line stages. Secondly, we propose an environment-aware codebook
generation scheme, which utilizes the statistical channel state information and
alternating optimization method to generate codewords offline. Then, in the
on-line stage, we use these pre-designed codewords to configure the RIS, and
the optimal codeword resulting in the highest sum rate is adopted for assisting
in the downlink data transmission. Thirdly, we analyze the theoretical
performance of the proposed protocol considering the channel estimation errors.
Finally, numerical simulations are provided to verify our theoretical analysis
and the performance of the proposed scheme.
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