Distributed interference cancelation based on outdated channel gain information

  • UACOOPERA from uacoopera
  • From Portugal
  • Responsive
  • Patents for licensing

Summary of the technology

New method aimed to enhance the overall throughput of communication systems by utilizing delayed channel gain information for distributed interference compression and removal. The technology targets a dynamic environment in which the transmitters, the receivers or even the scattering environment are not static and is useful for a communication scenario with several distributed transmitters and receivers sharing a common medium, in which interference removal is crucial to enhance system throughput and to enable simultaneous transmission of information from several transmitters to several receivers, using the same resources.



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 network state may be already different and then the adaptation is detrimental, instead of beneficial.

Channel gain information is a crucial component for enhancing the throughput of current and future wireless systems by enabling the adaptation of the transmission and reception entities to the network state. Channel gain information, when available, may be utilized to improve the system multiplexing gain and simultaneously send data to multiple receivers. The channel is usually estimated at the receivers and the fed back to the transmitter(s). This procedure leads to a delay in the availability of the channel gain information at the transmitter(s). If the delay is larger than the channel coherence time, due to e.g. high mobility, the current channel realization cannot be predicted by the received channel gain information. Therefore, the use of predicted channel gain information based on outdated information leads to no multiplexing gain.

This technology makes use of the outdated channel gain information, which allows the interference generated by a group of terminals into another terminal to be efficiently compressed and removed. Using this technology, the system throughput scales with half the square root of the number of terminals (e.g., 500% throughput improvement in a scenario with 100 terminals).


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



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


International patent application filed (PCT/IB2017/054124).


TRL 3-4: Laboratory tests with very promising numerical results.


Delayed channel information

Distributed compression

Repetition coding

Interference channel

Transmission over a shared medium

Multi transmitter/receiver pairs

Interference alignment


Researchers from Instituto de Telecomunicações (IT) from Universidade de Aveiro.


Licensing agreement.

Further joint technology development.


Universidade de Aveiro seeks companies within wireless communications area, interested in improving the capacity of their communication systems.

Technology #CI16019

Intellectual property status

  • Patent already applied for
  • Patent application number :PCT/IB2017/054124

Attached documents

Related Keywords

  • Electronics, IT and Telecomms
  • IT and Telematics Applications
  • Telecommunications, Networking
  • Broadband Technologies
  • Mobile Communications
  • Network Technology, Network Security
  • Cyber Security
  • Data Protection, Storage Technology, Cryptography, Data Security
  • Data Processing / Data Interchange, Middleware
  • Peripherals Technologies (Mass Data Storage, Displays)
  • Internet Technologies/Communication (Wireless, Wi-Fi, Bluetooth)
  • Sensors & Wireless products
  • Information Processing, Information System, Workflow Management
  • e-Government
  • Communications
  • Data Communications
  • Communications processors/network management
  • Other data communications
  • Local area networks (including voice/data PBX systems)
  • Network test, monitoring and support equipment
  • Big data management
  • Data communication components
  • Telephone Related
  • Modems and multiplexers
  • Telephone interconnect and other equipment
  • Message forwarding, queuing and answering systems, telephone management systems and PBXs
  • Terminals
  • Intelligent terminals
  • interference cancelation

About uacoopera

The University of Aveiro is a young and innovative university, which fosters entrepreneurship and technology and knowledge transfer, with expertise in a wide range of knowledge areas namely IT, Life Sciences (Biology, Chemistry, Biochemistry, Health, Environmental Sciences), Nanotechnology and Materials Science, Mechanics, Physics, Mathematics, Building, Design and Management. uacoopera is the Technology Transfer Office of University of Aveiro. This office engages in value adding activities such as start-up and spin-off creation, support to university-industry cooperation (sponsored research and consultancy services), IP protection and prosecution, licensing, marketing, among others. It covers four main interrelated functional areas – Intellectual Property Management, Licensing, Entrepreneurship, and Industry Liaison.

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