PAPR Reduction in OFDM System using QPSK Modulation and Companding Technique

Dr. Vandana. B. Malode, Ms.Pratibha P. Patil

Abstract Orthogonal Frequency Division Multiplexing (OFDM) is a spectrally efficient multicarrier modulation technique for high speed data transmission over multipath fading channels. One of the main issues of OFDM is high Peak-to-Average Power Ratio (PAPR) of the transmitted signal which adversely affects the complexity of power amplifiers. A-Law Companding method is also used in digital file formats and telephony systems for better signal-to-noise ratio (SNR) at lower bit rates. In this paper, Companding technique method is proposed to reduce peak-to-average of OFDM signal. Simulation results show that the proposed scheme may obtain significant PAPR reduction while maintaining good performance in the companding method. In this model this problem can be overcome by using the A-Law Companding Technique. By plotting the graph between BER and SNR it can be prove that this model is efficient. Keyword :-OFDM, PAPR, BER, Companding, Simulink.

Title:	PAPR Reduction in OFDM System using QPSK Modulation and Companding Technique
Author Name:	Dr. Vandana. B. Malode, Ms.Pratibha P. Patil
Abstract:	Abstract Orthogonal Frequency Division Multiplexing (OFDM) is a spectrally efficient multicarrier modulation technique for high speed data transmission over multipath fading channels. One of the main issues of OFDM is high Peak-to-Average Power Ratio (PAPR) of the transmitted signal which adversely affects the complexity of power amplifiers. A-Law Companding method is also used in digital file formats and telephony systems for better signal-to-noise ratio (SNR) at lower bit rates. In this paper, Companding technique method is proposed to reduce peak-to-average of OFDM signal. Simulation results show that the proposed scheme may obtain significant PAPR reduction while maintaining good performance in the companding method. In this model this problem can be overcome by using the A-Law Companding Technique. By plotting the graph between BER and SNR it can be prove that this model is efficient. Keyword :-OFDM, PAPR, BER, Companding, Simulink.
Cite this article:	Dr. Vandana. B. Malode, Ms.Pratibha P. Patil , " PAPR Reduction in OFDM System using QPSK Modulation and Companding Technique " , International Journal of Emerging Trends & Technology in Computer Science (IJETTCS), Volume 3, Issue 4, July - August 2014 , pp. 281-284 , ISSN 2278-6856.
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