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Distributed interference cancellation based on outdated channel gain information

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KEYWORDS: Delayed channel information, Distributed compression, Repetition coding, Interference channel, Transmission over a shared medium, Multi transmitter/receiver pairs, Interference alignment
SUMMARY:
New method aimed to enhance the overall throughput of communication systems by utilizing outdated channel gain information for distributed interference compression and removal.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.
TRL:
3-4
Laboratorial tests have been performed, with very promising numerical results.

Background and description

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proposes a method to efficiently compress and remove the interference generated by multiple receivers using only outdated channel information.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).

Applications

  • The technology is applicable in scenarios 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

Benefits

  • Enhanced throughput and proportional to the square root of the number of transmitter/receiver pairs.
  • Distributed interference cancellation using only outdated channel gain information.
  • Multiple transmitter/receiver pairs communicating using the same time and frequency resources.

Inventors

Patents

  • D. Castanheira, A. Silva, A. Gameiro, System and method of distributed interference cancelation based on delayed channel gain information, EP17751468, EPO, Granted, 07-07-2016,
    | Abstract
  • D. Castanheira, A. Silva, A. Gameiro, System and method of distributed interference cancelation based on delayed channel gain information, US16315710, National, Granted, 07-07-2016,
    | Abstract
  • D. Castanheira, A. Silva, A. Gameiro, System and method of distributed interference cancelation based on delayed channel gain information, PCT/IB2017/054124, PCT, 07-07-2016,
    | Abstract
  • D. Castanheira, A. Silva, A. Gameiro, Distributed interference cancelation based on delayed channel gain information, PT109516, National, Abandoned, 07-07-2016, Portugal

    • Publications

  • D. Castanheira, A. Silva, A. Gameiro, Retrospective Interference Alignment: Degrees of Freedom Scaling with Distributed Transmitters, IEEE Transactions on Information Theory, Vol. 63, No. 3, pp. 1721 - 1730, March, 2017,
    | Abstract     | Full text (PDF 1 MB) | BibTex
  • D. Castanheira, A. Silva, A. Gameiro, Retrospective Interference Alignment for the K -User M x N MIMO Interference Channel, IEEE Transactions on Wireless Communications, Vol. 15, No. 20, pp. 8368 - 8379, December, 2016,
    | Abstract     | Full text (PDF 365 KBs) | BibTex

    • REFERENCE: PI-0102

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