Implementation of OFDM Technique under the Influence of AWGN Channel for BER and PAPR Reduction

International Journal of Research and Scientific Innovation (IJRSI) | Volume V, Issue V, May 2018 | ISSN 2321–2705

Implementation of OFDM Technique under the Influence of AWGN Channel for BER and PAPR Reduction

Prashant Yadav¹, Devendra Patle²

¹M. Tech. Scholar, Dept. of ECE, SSS-IST, Sehore , RGPV, Bhopal (M.P.), India
²Assistant Professor, Dept. of ECE, SSS-UTMS, Sehore, RGPV, Bhopal (M.P.), India

Abstract— The past five decades have witnessed startling advances in digital communication technologies by the availability of faster, more reliable, and cheaper electronic components. The most drastic change is the multi-carrier transition with high SNR and low BER. In the last decade, a new transition technique has occurred i.e. OFDM by the means of ASK, FSK and PSK. In digital communications, the modulation is the process of transmitting time-domain message signals over channel in the bits form. In this paper, a digital data corresponding to a 2D Gray-scale image is used to estimate the overall performance of a modeled AWGN channel under the influence of modulation techniques such as BPSK, QPSK and 16-PSK.

Keywords: OFDM, QPSK, 16-PSK, FFT, IFFT, AWGN, PAPR, Bit Error Rate, SNR.

I. INTRODUCTION

The past five decades have witnessed startling advances in digital communication technologies by the availability of faster, more reliable, and cheaper electronic components. With the increasing complexity of these communication systems comes increasing complexity in the type of content being transmitted and received. In digital communication systems, the time-domain message signals are transformed to bits-form of different sizes by the means of IFFT bins allocator.
In single carrier communication system, the symbol period must be much greater than the delay time in order to avoid inter-symbol interference (ISI). Since data rate is inversely proportional to symbol period, having long symbol periods means low data rate and communication inefficiency. [1] While in a multicarrier system, such as OFDM (aka: Orthogonal Frequency Division Multiplexing), divides the total available bandwidth in the spectrum into sub-bands for multiple carriers to transmit in parallel [2]. An overall high data rate can be achieved by placing carriers closely in the spectrum techniques are continuously being developed to maximize data throughput and efficiency in these wireless communication systems while endeavouring to keep data loss and error to a minimum. The main aim in this paper is for reducing PAPR, by the means of QPSK and 16-PSK modulation techniques.

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