Joint User Detection and Channel Estimation in Grant-Free Random Access for Massive MIMO Systems

Algorithm 1

Joint detection and estimation in SOP.

	Require: The received signal , the preamble set and its length .
	Ensure: .
(1)	for i = 1: U do
(2)	The BS calculates the estimated channel as .
(3)	if then
(4)	The BS accepts as the estimated channel of a certain RA user, and appends it into .
(5)	end if
(6)	end for