Open AccessPerformance of mobile orthogonal frequency division multiplexing systems over time‐varying non‐linearities with memory
Author(s) -
Beremiz Hilario Tacuri Alexander,
Fortes José Mauro Pedro
Publication year - 2015
Publication title -
iet communications
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.355
H-Index - 62
eISSN - 1751-8636
pISSN - 1751-8628
DOI - 10.1049/iet-com.2014.1212
Subject(s) - computer science , electronic engineering , wideband , multiplexing , modulation (music) , linearity , orthogonal frequency division multiplexing , telecommunications , channel (broadcasting) , engineering , physics , acoustics
The performance of modern communications transmitters utilising multi‐carrier modulation techniques is highly sensitive to non‐linear distortions arising mainly from the high‐power amplifier. The increase in symbol duration makes the system more sensitive to time‐varying channels. In addition, the wideband characteristics of multi‐carrier signals result in frequency‐dependent distortions, typically known as memory effects. This study presents analytical expressions that can be used to evaluate the impact of the distortions induced by time‐varying non‐linearities with memory on the bit error rate performance of a multi‐carrier signal such as the orthogonal frequency division multiplexing. The time‐varying non‐linearity with memory is modelled by a time‐varying Volterra series. The resulting mathematical expressions are applied to specific situations, allowing for a quantitative evaluation of the system performance degradation.