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In our previous work, the linear system was solved in 64-bit floating-point arithmetic using the standard MATLAB linear solution mechanism, where X tilde = H inverse times Y is coded with the backslash operator, you can see in the first equation.
While these standard linear system solution computations give accurate results, direct implementation of these solutions for use in Massive MIMO receivers would require computational hardware with prohibitive cost in base stations.
To reduce the latency of estimating X, the linear system is solved in fixed-point arithmetic with reduced precision through an eigenvalue decomposition of the Hermitian matrix Theta. |
IEEE/ICACT20210153 Slide.07
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