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International Journal of Computational Engineering Research||Vol, 03||Issue, 4|| ||April||2013|| Page 186 Performance Comparison of Uncoded & Coded Adaptive OFDM System over AWGN Channel Swati M. Kshirsagar1 , A. N. Jadhav2 12 Department of E & TC, Patil College of Engg. & Tech., Kolhapur ,Maharashtra, India. I. INTRODUCTION Orthogonal frequency Division Multiplexing (OFDM) is the most popular modulation technique for wireless communications. OFDM is a digital multicarrier modulation scheme which uses a large number of closely spaced orthogonal subcarriers [2]. OFDM signals are generated using the Fast Fourier transform. Each individual carrier, commonly called as subcarrier. Each subcarrier is modulated with a conventional modulation scheme at a low symbol rate, maintaining data rates similar to conventional single carrier modulation schemes in the same bandwidth. OFDM is a logical next step in broadband radio evolution.
Performance Comparison Of Uncoded & Coded… www.ijceronline.com ||April||2013|| Page 187 An inverse Fourier transform (IFFT) converts the frequency domain data set into samples of the
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