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The results for 2 and 3 quantization bits are similar.
For a coarse quantization with 3 bits, three to four iterations generally suffices to achieve a good Bit-Error Rate.
It is observed that an additional iteration is generally needed in fixed-point implementation over the floating-point implementation to match their Bit-Error Rates.
It is apparent that a coarsely quantized MMIMO system with B=3 is robust enough and can operate with theta wl =9, but the cost of the implementation will be higher due to the increased complexity of the implementation in fixed-point arithmetic.
The Bit-Error Rate does not improve significantly for a theta wl greater than 11.
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IEEE/ICACT20210153 Slide.15
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