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 (), that specifically targets the parts of data symbols that experience no interference during a packet collision. 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 on the WARP software-defined radio platform and in trace-based simulation. Our performance evaluation presents experimental results from this implementation operating in a 12node software network testbed, spread over two rooms in a nonlineofsight indoor office environment. Experimental results confirm that our proposal decoder is capable of decoding up to 60<inline-formula> <tex-math notation="LaTeX">$\%$</tex-math> </inline-formula> of collided frames depending on the type of data and modulation used. This consistently leads to throughput enhancement over conventional WiFi under different scenarios and for the various data types tested, namely downlink bulk TCP, downlink videoondemand, and uplink UDP.

Original languageEnglish (US)
Pages (from-to)1-15
Number of pages15
JournalIEEE/ACM Transactions on Networking
StateAccepted/In press - 2022

All Science Journal Classification (ASJC) codes

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


  • 802.11
  • collision environments
  • Decoding
  • hidden terminals
  • Interference
  • Interference cancellation
  • interference cancellation
  • OFDM
  • OFDM
  • Partial symbol recovery
  • Receivers
  • Symbols
  • wireless communications
  • Wireless networks


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