Constrained Message Length Coding for Low Peak to Average Power Ratio in FBMC: OQAM Systems
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Constrained Message Length Coding for Low Peak to Average Power Ratio in FBMC: OQAM Systems Job Chunkath1,2 · V. S. Sheeba1,2
© Springer Science+Business Media, LLC, part of Springer Nature 2020
Abstract The FBMC generation techniques are found to surmount the disadvantages of the IFFT/ FFT based OFDM system. The minimization of PAPR is a much sought after solution by all multi-carrier methods. This paper investigates the possibility of a unified approach for error control coding and PAPR minimization in an FBMC-OQAM system. A new coding procedure called Constrained Message Length (CML) coding is presented in this paper. A new perspective on PAPR and an analytical framework for estimating the PAPR is also presented. Hybrid techniques using coding and companding are tested for different channel models, and their BER performance is on par with the BCH system. The proposed system is of low complexity and has a PAPR of only 3.81 dB, which is better than or comparable with the existing systems that are using complex methods. This paper has uniquely investigated the dependence of PAPR on the input data variation for a different set of random data loads. The CML coding proposed here can minimize the input data dependent PAPR deviation to a low variance of 0.045 dB, which provides an increased linear region of operation to the power amplifier in the RF section. Keywords Bit error rate · Block codes · Companding · Fading · Peak to average power ratio
1 Introduction The tremendous development of wireless communication services has resulted in escalating the demand for enhanced data rates in several application areas. The high data rate demand has resulted in the exploration of the latest strategies for implementing wireless communication. The contemporary data rate demand is supported by the utilization of multi-carrier (MC) based systems, rather than a single carrier (SC) systems prevailing in earlier days. The flexibility to perform well in multi-path propagation and frequency selective fading environments was considered an essential advantage for using this idea. The multi-carrier communication scheme considers wideband frequency selective channel as * Job Chunkath [email protected] 1
University of Calicut, Thenjipalam, India
2
Government Engineering College, Thrissur, Kerala, India
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J. Chunkath, V. S. Sheeba
a number of narrowband sub-channels with flat fading characteristics, which may be corrected by using simple equalization techniques at the receiver. One of the preferred multi-carrier systems currently being employed is the Orthogonal Frequency Division Multiplexing (OFDM) technique [1]. Several wideband applications like Digital Audio Broadcast (DAB), Digital Video Broadcast (DVB), and Wi-Fi use OFDM techniques. The high spectral efficiency is the chief advantage of OFDM. It uses the cyclic prefix (CP) to overcome the Inter-Symbol Interference (ISI) caused by delay spread. The utilization of CP results in redundancy in data and results in a decrease in the overall data ra
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