Implementation of Adaptive Huffman Codes for PAPR Reduction in OFDM Systems
Orthogonal Frequency Division Multiplexing (OFDM) is one of the upcoming techniques for achieving large data rates in 4G/5G wireless communication. In OFDM system, the data are transmitted over sizable subcarriers and modulated with low symbol rate. High-
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Abstract Orthogonal Frequency Division Multiplexing (OFDM) is one of the upcoming techniques for achieving large data rates in 4G/5G wireless communication. In OFDM system, the data are transmitted over sizable subcarriers and modulated with low symbol rate. High-peak-to-average-power ratio (PAPR) is the major disadvantage in OFDM systems that results in out of band energy distortion, intermodulation among the subcarriers, and saturation in power amplifiers. This paper deals with the analyzing the PAPR reduction in OFDM systems using digital communication codes. Adaptive Huffman codes (AHC) is selected and applied in OFDM transmitter section for reducing the high peak signals. The encoding part selected in AHC is Vitter’s algorithm. QAM16 and PSK mapping schemes are used for modulating the data. Simulation is carried out for the proposed work using MATLAB software, and PAPR results are showed in Complementary Cumulative Distribution Function (CCDF) plot. Further, the PAPR results are compared with Huffman coding and using no codes. Simulation results show that for all subcarriers, the PAPR reduction of adaptive Huffman codes dominates the Huffman codes and using no codes. Keywords PAPR · Adaptive huffman codes (AHC) · QAM · PSK · CCDF
S. P. Vimal (B) · N. Sathish Kumar · M. Kasiselvanathan Department of Electronics and Communication Engineering, Sri Ramakrishna Engineering College, Coimbatore, Tamil Nadu 641022, India e-mail: [email protected] N. Sathish Kumar e-mail: [email protected] M. Kasiselvanathan e-mail: [email protected] © Springer Nature Singapore Pte Ltd. 2021 P. Suresh et al. (eds.), Advances in Smart System Technologies, Advances in Intelligent Systems and Computing 1163, https://doi.org/10.1007/978-981-15-5029-4_3
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S. P. Vimal and N. Sathish Kumar
1 Introduction The emerging domain in communication research area is wireless communication. The necessary goal of the wireless communication is to enhance intersymbol interference, bandwidth reduction, intercarrier interference, and complexity of the system. However, OFDM is one of the latest techniques for achieving high data rates in 4G/5G wireless communication systems [1]. In multipath fading environment, OFDM systems can be operated in high speed. Spectral overlapping is possible in OFDM systems. Due to spectral overlapping, more than fifty percentage of bandwidth have been saved in OFDM systems when compared to ordinary FDM systems. The application in OFDM systems leads to less energy loss in frequency domain. The main disadvantage in OFDM systems is high PAPR. The utilization of large number of subcarriers in OFDM systems will result in high PAPR. High PAPR makes the amplifier side to work in nonlinear region which causes bit error rate degradation and adjacent channel interference [2]. In this paper, the adaptive Huffman encoding algorithm is applied in the OFDM transmitter section, so that the high peak powers are eliminated before the transmission starts [3, 4]. There are various PAPR reduction techniques such as to
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