Reduction of subcarriers spectrum sidelobes and intermodulationin NC-OFDM system

Abstract : The paper tackles the problem of efficient reduction of the out-of-band (OOB) radiation in multi-carrier systemswhen considering the presence of a nonlinear power amplification.It is important to provide "green" transmitters producing less electromagnetic "pollution" out of its nominal frequency band and obtaining at the same time high energy efficiency of the used power amplifier. One of the known methods assumes appropriate modulation of dedicated subcarriers by specially calculated symbols reducingOOB radiation.The solution proposed in this paper combinestwo approaches, among which the first, called cancellation carriers, is used traditionally for subcarrier sidelobes minimization, and the second,called tone reservation, for peak to average power ratio reduction. The novelty of this work is in joint minimization of both aforementioned metrics in the near optimal waywhile keeping low computational complexity. The result is seen as a decreased power of the OOB radiation observed after signal passing through the power amplifier.The obtained results confirm that the proposed algorithm outperforms the approaches in which those metrics are minimized separately. Additionally, a number of simulations has been carried out to investigate the influence of the proposed algorithm parameters on the resultant out-of-band radiation performance.
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https://hal-supelec.archives-ouvertes.fr/hal-00859663
Contributor : Myriam Andrieux <>
Submitted on : Monday, September 9, 2013 - 10:59:20 AM
Last modification on : Friday, November 16, 2018 - 1:29:26 AM

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  • HAL Id : hal-00859663, version 1

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Pawel Kryszkiewicz, Adrian Kliks, Yves Louët. Reduction of subcarriers spectrum sidelobes and intermodulationin NC-OFDM system. GROWN 2013, Oct 2013, Lyon, France. ⟨hal-00859663⟩

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