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We study the problem of unsourced random access (URA) over Rayleighblock-fading channels with a receiver equipped with multiple antennas. Weemploy multiple stages of orthogonal pilots, each of which is randomly pickedfrom a codebook. In the proposed scheme, each user encodes its message using apolar code and appends it to the selected pilot sequences to construct itstransmitted signal. Accordingly, the received signal consists of superpositionof the users' signals each composed of multiple orthogonal pilot parts and apolar coded part. We use an iterative approach for decoding the transmittedmessages along with a suitable successive interference cancellation scheme.Performance of the proposed scheme is illustrated via extensive set ofsimulation results which show that it significantly outperforms the existingapproaches for URA over multiple-input multiple-output fading channels.

Unsourced Random Access with a Massive MIMO Receiver Using Multiple Stages of Orthogonal Pilots