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In this letter, we extend the sparse Kronecker-product (SKP) coding scheme,originally designed for the additive white Gaussian noise (AWGN) channel, tomultiple input multiple output (MIMO) unsourced random access (URA). With theSKP coding adopted for MIMO transmission, we develop an efficient Bayesianiterative receiver design to solve the intended challenging trilinearfactorization problem. Numerical results show that the proposed designoutperforms the existing counterparts, and that it performs well in allsimulated settings with various antenna sizes and active-user numbers.

Receiver Design for MIMO Unsourced Random Access with SKP Coding