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Due to their length and random nature, data signals of different users are likely to have very low correlation with each other.
For this reason, the Hermitian matrix Theta is diagonal dominant.
This figure shows a sample of the reduced-wordlength matrix Theta in a Massive MIMO configuration with 128 receive antennas,
16 transmit (or user) antennas, and 1 quantization bit.
Based on the statistics we collected, a wordlength of 9 bits provides sufficient precision to store each element of the matrix Theta.
Before eigenvalue decomposition, a Hessenberg decomposition is performed. However, this is not discussed here for simplicity.
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IEEE/ICACT20210153 Slide.11
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