INDA Finite Blocklength and Relaying

Introduction

In wireless communications, relaying is well known as an efficient way to mitigate wireless fading by exploiting spatial diversity However, typically these studies were based on the ideal assumption of communicating arbitrarily reliably at Shannons channel capacity, i.e., coding is assumed to be performed over an infinite blocklength. In the finite blocklength (FBL) regime, especially when the blocklength is short, the error probability (due to noise) becomes significant. To address this issue, an accurate approximation of achievable coding rate was identified by Polyanskiy for a single-hop transmission system while taking the error probability into account. As shown in Fig. 1, a significant performance gap is observed in the comparison between the two performance model, i.e., the Shannon capacity is not accurate for low-latency short blocklength systems. Subsequently, Polyanskiys initial work regarding AWGN channels were extended to Gilbert-Elliott Channels, quasistatic fading channels, quasi-static fading channels with retransmissions , as well as spectrum sharing networks. However, all these works focused on single-hop non-relaying systems, leaving the analysis of relaying in the finite blocklength regime an open problem.

Scientific Approach

We provide a detailed analysis of the performance of single-relay networks, multi-relay networks, relay assisted multi-terminal indstrial network, relay-assisted non-orthogonal multiple access (NOMA) network, relay-enabled simultaneous wireless information and power transferring (SWIPT). Moreover, the obtained analytical insights will be utilized to derive guidelines for the design of QoS-efficient and reliable networks. Instead of simply following the Shannon capacity or the accumulated mutual information model, we in particular consider the finite blocklength (low latency) impart on the system performance.

Selected results

Invited and award-winning conference papers:

Y. Hu, M. C. Gursoy, A. Schmeink, "Efficient transmission schemes for low-latency networks: NOMA vs. relaying", IEEE PIMRC, Qct. 2017, Montreal, QC, Canada. Best Paper
Y. Hu, C. Schnelling, Y. Amraue, A. Schmeink, "Finite blocklength performance of a multi-relay network with best single relay selection", IEEE ISWCS, Aug. 2017, Bologna, Italy. Best Paper.
Y. Hu, A. Schmeink, "Delay-constrained communication in edge computing networks", 19th IEEE SPAWC 2018, Kalamata, Greece. Invited Paper.
Y. Hu, M. C. Gursoy, A. Schmeink, "Optimal Power Allocation for Amplify and Forward Relaying with Finite Blocklength Codes and QoS Constraints", 87th IEEE VTC 2018-Spring, Porto, Portugal Invited Paper.
Y. Hu, Y. Zhu, A. Schmeink, "Simultaneous wireless information and power transfer in relay networks with finite blocklength codes", 23rd IEEE APCC Workshop, Dec. 2017, Perth, Australia, Invited Paper.
Y. Hu, A. Schmeink and J. Gross, "Relaying with finite blocklength: Challenge vs. opportunity", IEEE SAM, Special Session, Jul. 2016, Rio de Janeiro, Brazil, Invited Paper.

Journal publication/submissions:

Y. Hu, J. Gross, A. Schmeink, "On the performance advantage of relaying under the finite blocklength regime", IEEE Commun. Lett., vol.19, no.5, pp.779-82, May 2015.
Y. Hu, J. Gross, A. Schmeink, "QoS-Constrained energy efficiency of cooperative ARQ in multiple DF relay systems", IEEE Trans. Veh. Technol., vol.65, no.2, pp.848-59, Feb. 2016.
Y. Hu, J. Gross, A. Schmeink, "On the capacity of relaying with finite blocklength", IEEE Trans. Veh. Technol., vol. 65, no. 3, pp. 1790-94, Mar. 2016.
Y. Hu, A. Schmeink, J. Gross, "Blocklength-limited performance of relaying under quasi-static Rayleigh channels", IEEE Trans. Wireless Commun., vol. 15, no. 7, pp. 4548 - 58, July 2016.
Y. Hu, M. C. Gursoy, A. Schmeink, "Relaying-enabled ultra-reliable low latency communications in 5G", IEEE Network (Magazine), vol. 32, no. 2, pp. 62-68, March-April 2018.
Y. Hu, M. Serror, K. Wehrle and J. Gross, "Finite blocklength performance of multi-terminal cooperative wireless industrial networks", IEEE Trans. Veh. Technol., accepted to appear.
Y. Hu, A. Schmeink, J. Gross, "Optimal Scheduling of Reliability-Constrained Relaying System under Outdated CSI in the Finite Blocklength Regime", IEEE Trans. Veh. Technol., accepted to appear.
Y. Hu, M. Ozmen, M. C. Gursoy, A. Schmeink, "Optimal power allocation for QoS-constrained downlink multi-user networks in the finite blocklength regime", IEEE Trans. Wireless Commun., under review.
J. Dong, Y. Hu. L. Qiu, A. Schmeink, "Joint relay selection and resource allocation for multi-relay networks with imperfect CSI and QoS constraints" IET Electron. Lett., under review.
Q. He, Y. Hu , A. Schmeink, "Optimal recourse allocation for URLLC in sparse code multiple access networks", IEEE Access, under review.

Contact

Yulin Hu, Anke Schmeink.