Distributed interference cancellation based on outdated channel gain information

Summary of the technology

New method aimed to enhance the overall throughput of communication systems by utilizing outdated channel gain information for distributed interference compression and removal. The technology targets a dynamic environment with several distributed transmitters and receivers sharing a common medium.

Instituto de Telecomunicações
Instituto de Telecomunicações

Details of the Technology Offer

Interference is the main limitation faced by today wireless technologies, mainly due to the network densification, user density and the exponential increase in wireless data traffic verified in the last years. The dynamic nature of wireless communications further exacerbates the interference problem as the transmission and reception entities are unable to adapt as fast as the radio environment dynamics; namely, when they adapt the channel/network state may be already different and then the adaptation is detrimental, instead of beneficial.

This technology proposes a method to efficiently compress and remove the interference generated by multiple receivers using only outdated channel information. Using this technology, the system throughput scales with the square root of the number of terminals (e.g., 500% throughput improvement in a scenario with 100 terminals).


The technology is applicable inscenarios with several pairs of transmitters and receivers communicating simultaneously and using the same resources:

  • Vehicular and machine-to-machine communications
  • Scenarios with high density of users
  • Distributed data storage
  • Physical layer security for wireless communications


  • ENHANCED THROUGHTPUTand proportional to the square root of the number of transmitter/receiver pairs.
  • DISTRIBUTED INTERFERENCE CANCELLATIONusing only outdated channel gain information.
  • MULTIPLE TRANSMITTER/RECEIVER PAIRScommunicating using the same time and frequency resources.

Development stage

TRL 3-4

Laboratorialtests have been performed,with very promising numerical results.

Commercial offering

Licensing agreement

Testing new applications

Joint further developments

Target Market

ITseeks partners within information and communication technologies area (ICTs) tofurther develop, license or assign the technology, aswell aspossible end-users fortesting new applications.

Intellectual Property

-USA patent granted (US10476620)

-European patent granted (EP17751468)

Scientific publications

D.Castanheira, A. Silva and A.Gameiro, "Retrospective Interference Alignment for theK-UserM xN MIMO Interference Channel," inIEEE Transactions on Wireless Communications, vol. 15, no. 12, pp. 8368-8379, Dec. 2016,doi: 10.1109/TWC.2016.2614276.

D.Castanheira, A. Silva and A.Gameiro, "Retrospective Interference Alignment: Degrees of Freedom Scaling With Distributed Transmitters," inIEEE Transactions on Information Theory, vol. 63, no. 3, pp. 1721-1730, March 2017,doi: 10.1109/TIT.2017.2655343.

Technology ID









Intellectual property status

Attached documents

Related Keywords

  • Electronics, IT and Telecomms
  • Internet Technologies/Communication (Wireless, Wi-Fi, Bluetooth)
  • Telecommunications, Networking
  • Mobile Communications
  • SatelliteTechnology/Systems/Positioning/Communication in GPS - Global Positioning System
  • Communications Protocols, Interoperability
  • Transmission systems
  • Communications
  • Commercial Communications
  • Facsimile Transmission
  • Data Communications
  • Communications processors/network management
  • Protocol converters and emulators
  • Network test, monitoring and support equipment
  • Satellite Microwave Communications
  • Other Communications Related
  • interference cancelation
  • interference channel
  • transmitters
  • repetition coding

About Instituto de Telecomunicações

Instituto de Telecomunicações (IT) is a private, not-for-profit organization, of public interest, a partnership of nine institutions with research and development in the field of Telecommunications

IT mission is to create and disseminate scientific knowledge in the field of telecommunications.

IT is actively involved in fundamental and applied research both at national and international levels. Simultaneously it is committed to foster higher education and training, by hosting and tutoring graduate and postgraduate students. it also plays its role towards public society with public awareness initiatives, knowledge transfer to industry, and by providing consulting services on a non-competing basis.

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