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Open AccessArticle

Stability and Delay of NDMA-MPR Protocol in Rice-Correlated Channels with Co-Channel Interference

Research Centre in Real-Time and Embedded Comput-ing Systems, Intituto Politecnico do Porto, 4200-135 Porto, Portugal
This paper is an extended version of our paper published in the Second International Conference on Advances in Signal, Image and Video Processing—From Sensing to Applications (SIGNAL 2017), Barcelona, Spain, 21–25 May 2017.
Technologies 2019, 7(1), 22; https://doi.org/10.3390/technologies7010022
Received: 7 December 2018 / Revised: 28 January 2019 / Accepted: 2 February 2019 / Published: 13 February 2019
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Abstract

This paper investigates backlog retransmission strategies for a class of random access protocols with retransmission diversity (i.e., network diversity multiple access or NDMA) combined with multiple-antenna-based multi-packet reception (MPR). This paper proposes NDMA-MPR as a candidate for 5G contention-based and ultra-low latency multiple access. This proposal is based on the following known features of NDMA-MPR: (1) near collision-free performance, (2) very low latency values, and (3) reduced feedback complexity (binary feedback). These features match the machine-type traffic, real-time, and dense object connectivity requirements in 5G. This work is an extension of previous works using a multiple antenna receiver with correlated Rice channels and co-channel interference modelled as a Rayleigh fading variable. Two backlog retransmission strategies are implemented: persistent and randomized. Boundaries and extended analysis of the system are here obtained for different network and channel conditions. Average delay is evaluated using the M/G/1 queue model with statistically independent vacations. The results suggest that NDMA-MPR can achieve very low values of latency that can guarantee real- or near-real-time performance for multiple access in 5G, even in scenarios with high correlation and moderate co-channel interference. View Full-Text
Keywords: multiple access in 5G; retransmission diversity; signal-processing; multi-user detection; random access; multi-packet reception multiple access in 5G; retransmission diversity; signal-processing; multi-user detection; random access; multi-packet reception
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Sámano-Robles, R. Stability and Delay of NDMA-MPR Protocol in Rice-Correlated Channels with Co-Channel Interference. Technologies 2019, 7, 22.

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