[Retracted] Performance Evaluation of Spectral Efficiency for Uplink and Downlink Multi-Cell Massive MIMO Systems

Table 1

Comparison of Related Work of Se In Massive MIMO.

Work	Cell	UL/DL	Combining/precoding scheme
[7]	Multicell	UL&dl	MMSE precoding and combining
[8]	Multicell	UL&dl	MMSE, RZF, ZF, MR precoding
[9]	Multicell	UL	MMSE precoding
[10]	Single	UL&dl	ZF precoding
[16]	Single	UL&dl	—