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Codebook Design for RIS-assisted Communications
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  • Khushboo Sahu ,
  • Bhavesh Sonwani ,
  • Amit Kumar Shrivastava ,
  • Arzad Alam Kherani
Khushboo Sahu
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Bhavesh Sonwani
IIT Bhilai, IIT Bhilai, IIT Bhilai

Corresponding Author:[email protected]

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Amit Kumar Shrivastava
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Arzad Alam Kherani
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Abstract

In this paper, a 1-bit beamforming codebook for Reconfigurable Intelligent Surface (RIS) is designed for an indoor environment. Each codeword in a codebook is a phase pattern at RIS elements that reflects the signal to a desired angle. For a specific reflection angle, those codewords are computed that maximizes the signal-to-noise ratio (SNR) at the receiver (RX). Since multiple codewords can maximize the SNR, an algorithm to reduce the size of the codebook is proposed. This ensures that the codebook does not contain repetitive codewords. In addition, after the codebook design, the codeword selection procedure is performed using an Autoencoder (AE) that minimizes the Bit Error Rate (BER) at the receiver. The proposed method shows promising results in terms of BER with reduced codebook size.