Compressed sensing based joint-compensation of power amplifier's distortions in OFDMA cognitive radio systems

Anum Z. Ali, Oualid Hammi, Tareq Y. Al-Naffouri

Research output: Contribution to journalArticlepeer-review

11 Scopus citations

Abstract

Linearization of user equipment power amplifiers driven by orthogonal frequency division multiplexing signals is addressed in this paper. Particular attention is paid to the power efficient operation of an orthogonal frequency division multiple access cognitive radio system and realization of such a system using compressed sensing. Specifically, precompensated overdriven amplifiers are employed at the mobile terminal. Over-driven amplifiers result in in-band distortions and out of band interference. Out of band interference mostly occupies the spectrum of inactive users, whereas the in-band distortions are mitigated using compressed sensing at the receiver. It is also shown that the performance of the proposed scheme can be further enhanced using multiple measurements of the distortion signal in single-input multi-output systems. Numerical results verify the ability of the proposed setup to improve error vector magnitude, bit error rate, outage capacity and mean squared error. © 2011 IEEE.
Original languageEnglish (US)
Pages (from-to)508-520
Number of pages13
JournalIEEE Journal on Emerging and Selected Topics in Circuits and Systems
Volume3
Issue number4
DOIs
StatePublished - Dec 2013

ASJC Scopus subject areas

  • Electrical and Electronic Engineering

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