Physical-layer Network Coding in Two-Way Heterogeneous Cellular Networks with Power Imbalance

Ajay K Thampi, Soung Chang Liew, Simon M D Armour, Zhong Fan, Lizhao You, Dritan Kaleshi

Research output: Contribution to journalArticle (Academic Journal)peer-review

9 Citations (Scopus)
664 Downloads (Pure)


The growing demand for high-speed data, quality of service (QoS) assurance and energy efficiency has triggered the evolution of 4G LTE-A networks to 5G and beyond. Interference is still a major performance bottleneck. This paper studies the application of physical-layer network coding (PNC), a technique that exploits interference, in heterogeneous cellular networks. In particular, we propose a rate-maximising relay selection algorithm for a single cell with multiple relays assuming the decode-and-forward strategy. With nodes transmitting at different powers, the proposed algorithm adapts the resource allocation according to the differing link rates and we prove theoretically that the optimisation problem is log-concave. The proposed technique is shown to perform significantly better than the widely studied selection-cooperation technique. We then undertake an experimental study -- on a software radio platform -- of the decoding performance of PNC with unbalanced SNRs in the multiple-access transmissions. This problem is inherent in cellular networks and it is shown that with channel coding and decoders based on multiuser detection and successive interference cancellation, the performance is better with power imbalance. This paper paves the way for further research in multi-cell PNC, resource allocation, and the implementation of PNC with higher-order modulations and advanced coding techniques.
Original languageEnglish
Pages (from-to)9072-9084
Number of pages13
JournalIEEE Transactions on Vehicular Technology
Issue number11
Early online date14 Jan 2016
Publication statusPublished - Nov 2016


  • Physical-layer Network Coding
  • PNC
  • Interference
  • Cooperation
  • Cellular Networks
  • LTE-A
  • WiMAX
  • CoMP
  • Heterogeneous Networks
  • HetNet
  • Relay Selection
  • Software Radio
  • USRP

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