Partial OFDM Symbol Recovery to Improve Interfering Wireless Networks Operation in Collision Environments

Waseem Ozan, Izzat Darwazeh, Kyle Jamieson

Research output: Contribution to journalArticlepeer-review


The uplink data rate region for interfering transmissions in wireless networks has been characterised and proven, yet its underlying model assumes a complete temporal overlap. Practical unplanned networks, however, adopt packetized transmissions and eschew tight inter-network coordination, resulting in packet collisions that often partially overlap, but rarely ever completely overlap. In this work, we report a new design called Partial Symbol Recovery (PSR), that specifically targets the parts of data symbols that experience no interference during a packet collision. PSR bootstraps a successive interference cancellation (SIC) like decoder from these strong signals, thus improving performance over techniques oblivious to such partial packet overlaps. We have implemented PSR on the WARP software-defined radio platform and in trace-based simulation. Our performance evaluation presents experimental results from this implementation operating in a 12-node software network testbed, spread over two rooms in a non-line-of-sight indoor office environment. Experimental results confirm that our proposal PSR decoder is capable of decoding up to 60% of collided frames depending on the type of data and modulation used. This consistently leads to throughput enhancement over conventional Wi-Fi under different scenarios and for the various data types tested, namely downlink bulk TCP, downlink video-on-demand, and uplink UDP.

Original languageEnglish (US)
Pages (from-to)680-694
Number of pages15
JournalIEEE/ACM Transactions on Networking
Issue number2
StatePublished - Apr 1 2023

All Science Journal Classification (ASJC) codes

  • Software
  • Computer Science Applications
  • Computer Networks and Communications
  • Electrical and Electronic Engineering


  • 802.11
  • OFDM
  • Partial symbol recovery
  • collision environments
  • hidden terminals
  • interference cancellation
  • wireless communications


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