Distributed interference cancelation based on outdated channel gain information

Posted by uacooperaResponsive · Patents for licensing · Portugal

Summary of the technology

A group of researchers from a Portuguese university has developed a technology for distributed communication systems where several pairs of transmitters/receivers communicate simultaneously using the same resources.
The invention aims to increase the throughput of current cellular communication systems.
The advantages of this technology in relation to existing solutions are:
1) the throughput is enhanced and proportional to the square root of the number of transmitter/receiver pairs.
2) the interference is canceled using only outdated channel gain information and the interference removal procedure is distributed.
The university is looking for companies on the wireless communications arena interested in improving the capacity of their communication systems.

Main advantages of its use

The present invention has the following advantages over existing technologies:

  1. It uses outdated channel gain information to increase system throughput. Existing technologies use the channel gain information to predict the current channel gains. However, this information may be outdated, then the prediction process brings no benefit to the system.
  2. The system throughput increases proportionally to the square root of the number of terminals involved. For existing technologies, the throughput does not increase with the number of involved terminals.
  3. This technology enables the coexistence of multiple transmitter/receiver pairs in the same time and frequency resources. The generated interference is removed in a distributed manner.


   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 then fed back to the transmitter(s). This procedure leads to a delay in the availability of channel gain information at the transmitter(s). If the delay is larger than the channel coherence time, due to high mobility for example, 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. Namely, with the proposed technology the interference generated by a group of terminals into another terminal is compressed and removed efficiently using the outdated channel gain information. Using this technology, the system throughput scales with half the square root of the number of terminals. For example, if we consider a scenario with 100 terminals the throughput improves by 500%.


The proposed invention has application in scenarios where several transmitter and receiver pairs communicate simultaneously. Among these applications we have vehicular communications, machine to machine communications and stadium wireless communications, including coffee shops, public spaces such as supermarkets, airports, hospitals and business workspaces.

Intellectual property status

Pending patent

Current development status

Laboratory tested.

Desired business relationship

Licencing and/or further joint development.

Related keywords

  • Telecommunications, Networking
  • Data Communications
  • Other Communications Related

About uacoopera

Technology Transfer Office from Portugal

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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