Inter-client interference cancellation for full-duplex networks with half-duplex clients

Ching-Ju Lin*, Kai Cheng Hsu, Hung Yu Wei

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

1 Scopus citations

Abstract

Recent studies have experimentally shown the gains of full-duplex radios. However, due to its relatively higher cost and complexity, we can envision a more practical step in the network evolution is to have a full-duplex access point AP but keep the clients half-duplex. Unfortunately, the full-duplex gains can hardly be extracted in practice as the uplink transmission from a half-duplex client introduces inter-client interference to another downlink client. To address this issue, we present the design and implementation of IC2 Inter-Client Interference Cancellation, the first physical layer solution that exploits the AP's full-duplex capability to actively cancel the interference at the downlink client. Such active cancellation not only improves the achievable capacity, but also better tolerates imperfect user pairing, simplifying the MAC design as a result. We build a prototype of IC2 on USRP-N200 and evaluate its performance via both testbed experiments and large-scale trace-driven simulations. The results show that, without IC2, about 60 of client pairs produce no gain from full-duplex transmissions, while, with IC2 the median gain of the achievable rate over conventional half-duplex networks can be $1.65\times $ and $1.47\times $ for 1- and 2-antenna scenarios, respectively, even when clients are simply paired randomly.

Original languageEnglish
Article number3370585
Pages (from-to)2150-2163
Number of pages14
JournalIEEE/ACM Transactions on Networking
Volume27
Issue number5
DOIs
StatePublished - Oct 2019

Keywords

  • Access protocol
  • Communication networks
  • Interference cancellation

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