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Enhancement of Power Efficiency in OFDM System by SLM with Predistortion Technique

Authors :
Pankaj Kumar Sharma
R. K. Nagaria
T. N. Sharma
Source :
Journal of Telecommunications and Information Technology, Iss 4 (2023)
Publication Year :
2023
Publisher :
National Institute of Telecommunications, 2023.

Abstract

Orthogonal Frequency Division Multiplexing (OFDM) is considered as a strong candidate for future wireless communication because it is marked by its higher frequency multiplicity and greater immunity to multipath fading. However, the main drawback of OFDM is its high amplitude fluctuations measured by peak-to-average power ratio (PAPR), which leads to power inefficiency and requires expensive high power amplifier (HPA) with very good linearity. In this paper, we propose selected mapping (SLM) with predistortion technique to decrease the nonlinear distortion and to improve the power efficiency of the nonlinear HPA. In the proposed method SLM reduces the PAPR and improves the power efficiency, the predistorter improves the bit error rate (BER) performance of the system. The PAPR reduction is possible with SLM when compared with original OFDM. After reducing the PAPR with SLM the data goes into the HPA with and without predistorter. The BER performance curves of SLM method with or without predistorter shows that, predistorter operates more effectively in SLM method than original OFDM system. At 4 dB IBO (input backoff) the conventional method with predistorter achieves 1.8 dB SNR gain than conventional method without a predistorter and at 6 dB IBO the BER performance is towards the ideal linear amplifier. The proposed system will be evaluated for OFDM system in the presence of a nonlinear power amplifier.

Details

Language :
English
ISSN :
15094553 and 18998852
Issue :
4
Database :
Directory of Open Access Journals
Journal :
Journal of Telecommunications and Information Technology
Publication Type :
Academic Journal
Accession number :
edsdoj.b5c7e0f69904eada730d39d02cc6cf0
Document Type :
article
Full Text :
https://doi.org/10.26636/jtit.2011.4.1183