Adaptive nonlinear interference suppressor for cognitive radio applications

H. Habibi, E. Pooh Ling, E.J.G. Janssen, Yan Wu, D. Milosevic, J.W.M. Bergmans, P.G.M. Baltus

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Abstract

To utilize the radio frequency spectrum efficiently a Cognitive Radio (CR) can operate as a secondary user in a frequency band which is licensed to a primary user. To this end, the CR must sense the spectrum continuously to find empty frequency channels for its transmission. The transmitted signal by the local transmitter of the CR, however, induces a strong local interference in the local receiver of the CR. Hence a half-duplex transceiver is used where the transmit and sense operations are done in separate time slots. The time-slotted operation though, reduces the throughput of the CR. This paper proposes application of an adaptive Nonlinear Interference Suppressor (NIS) to suppress this strong local interference to enable simultaneous transmit and sense. We present experimental results of a transceiver testbed that uses an implementation of the NIS, fabricated in 140 nm CMOS technology. These experiments show that the NIS can substantially suppress the local interference with low complexity and power consumption.
Original languageEnglish
Title of host publicationProceedings of the Workshop on Cognitive Radio, 18-19 June 2013, Kista, Sweden
Pages16-20
Publication statusPublished - 2013
Eventconference; Partnership for Cognitive Radio (PARC4CR) Symposium, Kista, Sweden -
Duration: 1 Jan 2013 → …

Conference

Conferenceconference; Partnership for Cognitive Radio (PARC4CR) Symposium, Kista, Sweden
Period1/01/13 → …
OtherPartnership for Cognitive Radio (PARC4CR) Symposium, Kista, Sweden

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    Habibi, H., Pooh Ling, E., Janssen, E. J. G., Wu, Y., Milosevic, D., Bergmans, J. W. M., & Baltus, P. G. M. (2013). Adaptive nonlinear interference suppressor for cognitive radio applications. In Proceedings of the Workshop on Cognitive Radio, 18-19 June 2013, Kista, Sweden (pp. 16-20)