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Short-Packet Communications for MIMO NOMA Systems over Nakagami-m Fading BLER and Minimum Blocklength Analysis

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Document pages: 12 pages

Abstract: Recently, ultra-reliable and low-latency communications (URLLC) usingshort-packets has been proposed to fulfill the stringent requirements regardingreliability and latency of emerging applications in 5G and beyond networks. Inaddition, multiple-input multiple-output non-orthogonal multiple access (MIMONOMA) is a potential candidate to improve the spectral efficiency, reliability,latency, and connectivity of wireless systems. In this paper, we investigateshort-packet communications (SPC) in a multiuser downlink MIMO NOMA system overNakagami-m fading, and propose two antenna-user selection methods consideringtwo clusters of users having different priority levels. In contrast to thewidely-used long data-packet assumption, the SPC analysis requires the redesignof the communication protocols and novel performance metrics. Given thiscontext, we analyze the SPC performance of MIMO NOMA systems using the averageblock error rate (BLER) and minimum blocklength, instead of the conventionalmetrics such as ergodic capacity and outage capacity. More specifically, tocharacterize the system performance regarding SPC, asymptotic (in the highsignal-to-noise ratio regime) and approximate closed-form expressions of theaverage BLER at the users are derived. Based on the asymptotic behavior of theaverage BLER, an analysis of the diversity order, minimum blocklength, andoptimal power allocation is carried out. The achieved results show that MIMONOMA can serve multiple users simultaneously using a smaller blocklengthcompared with MIMO OMA, thus demonstrating the benefits of MIMO NOMA for SPC inminimizing the transmission latency. Furthermore, our results indicate that theproposed methods not only improve the BLER performance but also guarantee fulldiversity gains for the respective users.

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