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A new random access scheme is proposed to solve the intra-cell pilotcollision for M2M communication in crowded asynchronous massive multiple-inputmultiple-output (MIMO) systems. The proposed scheme utilizes the proposedestimation of signal parameters via rotational invariance technique enhanced(ESPRIT-E) method to estimate the effective timing offsets, and then active UEsobtain their timing errors from the effective timing offsets for uplink messagetransmission. We analyze the mean squared error of the estimated effectivetiming offsets of UEs, and the uplink throughput. Simulation results show that,compared to the exiting random access scheme for the crowded asynchronousmassive MIMO systems, the proposed scheme can improve the uplink throughput andestimate the effective timing offsets accurately at the same time.

A novel random access scheme for M2M communication in crowded asynchronous massive MIMO systems