System Performance Improvement For Ofdm System Over Generalized K Fading Channel

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SER Performance Improvement in OFDM System over Generalized K-Fading Channel

Keerti Tiwari, Bindu Bharti and Davinder S. Saini

Department of Electronics and Communication Engineering
Jaypee University of Information Technology
Waknaghat, Solan (H.P.)-173234, India krt.tiwari@gmail.com, bindu.bharti457@gmail.com, davinder.saini@juit.ac.in

Abstract— In this paper, performance metric of orthogonal frequency division multiplexing (OFDM) system is analyzed over a composite fading channel i.e. generalized K- fading channel. Here, OFDM system is considered which include repetition code to enhance the wireless link performance with simplicity. Symbol error rate (SER) performance is evaluated using binary phase shift keying (BPSK) and 16-qardature amplitude modulation (16-QAM) over generalized-K fading channel. This channel model considers Nakagami-m distribution to define multipath and gamma distribution to represent shadowing. Simulation results demonstrate that improved system performance can be achieved using repetition code in severely faded environment. A comparative study of coded and uncoded system is also given in this paper. Consequently, SER performance is improved with the increase in shape parameters.
Keywords— Orthogonal frequency division multiplexing (OFDM), Generalized K-fading, binary phase shift keying (BPSK), 16-qardature amplitude modulation (16-QAM), symbol error rate (SER). Introduction
Next generation wireless technologies have demanded efficient and

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