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The challenge of designing a Massive MIMO base station is to minimize the wordlengths qwl and theta wl while the Bit-Error Rate is maintained at acceptable levels.
The iterative channel estimator used in our prior work has been converted to use only fixed-point arithmetic.
The wordlength of matrix Q was set to 6 and 7 bits.
The wordlength of matrix Theta was set to 9, 10, and $11$.
The number of quantization bits were set to 1, 2, and 3.
It is apparent that for a coarse quantization with 1 bit, neither the floating-point nor the fixed-point implementations
do not achieve a satisfactory Bit-Error Rate in a small number of iterations.
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IEEE/ICACT20210153 Slide.13
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