Open AccessPower amplifier linearisation scheme to mitigate superfluous radiations and suppress adjacent channel interference
Author(s) -
Varahram Pooria,
Ali Borhanuddin Mohd,
Mohammady Somayeh,
Sulaiman Nasri
Publication year - 2014
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.2013.0291
Subject(s) - amplifier , adjacent channel , linear amplifier , linearity , adjacent channel interference , electronic engineering , computer science , distortion (music) , rf power amplifier , direct coupled amplifier , interference (communication) , power added efficiency , electrical engineering , control theory (sociology) , channel (broadcasting) , telecommunications , operational amplifier , engineering , cmos , control (management) , artificial intelligence
Power amplifiers are one of the costly devices in wireless communication systems and exhibit non‐linearity. The problem of non‐linearity in the power amplifier categorises in two disturbance impacts, output distortion and in‐band distortion which lead to adjacent channel interference and constellation deviation, respectively. In order to gain maximum efficiency of the power amplifier and reduce interference, the authors propose a new digital pre‐distortion scheme called complex gain convergence (CGC). The proposed scheme is compared with indirect learning architecture and validated against an laterally diffused metal oxide semiconductor (LDMOS) power amplifier. The outcome of applying CGC scheme shows enhancement in adjacent channel leakage ratio and error vector magnitude performance while the complexity is even lower. An experimental demonstration with the actual power amplifier is also presented.