Grant-Free NOMA in Cell-Free Massive MIMO Over Universal Filtered Multicarrier for mURLLC

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This paper investigates grant-free non-orthogonal multiple access (NOMA) in cell-free massive multiple-input multiple-output networks over universal filtered multicarrier (UFMC) for massive ultra-reliable low-latency communication (mURLLC). We identify that the even-component of the frequency domain (FD) received signal is free from both inter-sub-band and inter-sub-carrier interference, whereas the odd-component is affected by both. Initially, a covariance-based algorithm is applied for active user detection (AUD) using only the even-component. To further enhance AUD performance, we propose an innovative method that leverages the block sparsity of user activity. Additionally, we introduce an efficient method to utilize the odd-component of the FD received signal to refine the unreliable estimates obtained from the covariance-based approach. Simulation results validate the effectiveness of the proposed methods.

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