Analysis and simulation of HPAs' effects on satellite OFDM systems

Cheng, Lei; Tong, Xinhai; Jian, Wu; Kong, Bo

doi:10.1109/icist.2013.6747755

Cited by 3 publications

(1 citation statement)

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“…Predistortion can be further classified into RF predistortion and digital predistortion. In RF predistortion, a compressive characteristic, created by the nonlinearity in the lower path is subtracted from a linear characteristic to generate an expansive characteristic [12]. On the other hand, the digital predistortion exploit processing power available from DSP.…”

Section: Fig 3 Predistortion Modelmentioning

confidence: 99%

Nonlinearity effect of Power Amplifiers in wireless communication systems

Yadav

Bera

2014

2014 International Conference on Electronics, Communication and Computational Engineering (ICECCE)

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High Power Amplifier in wireless communication systems exhibit nonlinear behavior which causes signal degradation. This is detrimental to the signals that pass through it. It appears in the form of Harmonic distortion, Gain compression, Inter-modulation distortion, Phase distortion, adjacent channel interference, etc. Orthogonal frequencydivision multiplexing (OFDM) is considered to be better techniques for multicarrier wireless communication. It has tolerance to inter-symbol interference and good spectral efficiency but are subjected to nonlinearities of power amplifiers, due to their high peak-to-average power ratio (PAPR). In this paper, some of the basic PAPR reduction techniques like: Peak clipping, random phase shifting, selected mapping (SLM) and dummy sequence insertion (DSI) methods have been discussed. The results obtained has been compared with original PAPR which suggests improvement in nonlinearity with modest reduction in efficiency and increase in hardware implementations. Among the various techniques SLM method gives low PAPR than other methods.

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Section: Fig 3 Predistortion Modelmentioning

confidence: 99%