Compensation schemes and performance analysis of jointly nonlinear amplifier and timing errors for CP-OFDM based cognitive radio networks

The principal objective of cognitive radio (CR) networks is to configure and share dynamically the spectrum resources in order to avoid user interference and congestion. This goal is limited by the effect of errors synchronization between primary and secondary users. In this paper, we study the impa...

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Bibliographic Details
Published in:Wireless networks 2019-05, Vol.25 (4), p.2173-2185
Main Authors: Lajnef, Hanen, Cherif Dakhli, Maha, Hizem, Moez, Bouallegue, Ridha
Format: Article
Language:English
Subjects:
Bit error rate
Cognitive radio
Communications Engineering
Compensation
Computer Communication Networks
Electrical Engineering
Engineering
Interference
Internet of Things
IT in Business
Iterative methods
Networks
Nonlinear analysis
Nonlinearity
Orthogonal Frequency Division Multiplexing
Radio communications
Radio networks
Receivers & amplifiers
Signal processing
Synchronism
Wireless networks
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Summary:The principal objective of cognitive radio (CR) networks is to configure and share dynamically the spectrum resources in order to avoid user interference and congestion. This goal is limited by the effect of errors synchronization between primary and secondary users. In this paper, we study the impact of the asynchronism on the cyclic prefix-based orthogonal frequency division multiplexing modulation (CP-OFDM) including nonlinear HPA model. The considered system includes a reference primary user perfectly synchronized with its reference base station and Nsu interfering secondary users. We provide a new theoretical aspect of interference analysis in the context of the OFDM based CR network. Furthermore, on the basis of this analysis, we derive the accurate expression of bit error rate in the presence of a Rayleigh flat fading channel. Finally, to solve the problems of asynchronism and nonlinearity, a hybrid iterative method of compensation and parallel interference cancellation have been developed based on these two conditions.
ISSN:1022-0038
1572-8196
DOI:10.1007/s11276-018-1805-1