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In this letter, we study the performance of a downlink multiuser massivemultiple-input multiple-output (MIMO) system with sub-connected structure overlimited feedback channels. Tight rate approximations are theoretically analyzedfor the system with pure analog precoding and hybrid precoding. The effect ofquantized analog and digital precoding is characterized in the derivedexpressions. Furthermore, it is revealed that the pure analog precodingoutperforms the hybrid precoding using maximal-ratio transmission (MRT) or zeroforcing (ZF) under certain conditions, and we theoretically characterize theconditions in closed form with respect to signal-to-noise ratio (SNR), thenumber of users and the number of feedback bits. Numerical results verify thederived conclusions on both Rayleigh channels and mmWave channels.

Analog Versus Hybrid Precoding for Multiuser Massive MIMO with Quantized CSI Feedback