Abstract

The orthogonal frequency division multiplexing (OFDM) is most commonly used in the area of communication where a large amount of data needs to be transmitted through a wired or wireless channel. The main application OFDM lies in wireless network, internet model and digital video/audio broadcasting. Data need to be divided over a number of orthogonal channels to minimize the interference between each transmission channel and commonly performed using analog circuitry method. However, this method is less stable and bulky. In this paper, an efficient reconfigurable architecture for advanced OFDM transmission has been proposed. The architecture consists of 31 subcarrier channel, OFDM system using 64 point modified coordinate rotation digital computer (CORDIC) based inverse fast Fourier transform (IFFT) and novel 4 point quadrature amplitude modulation (QAM) is used for modulations of each channel. The input data is converted from serial to parallel, encoded using Hermitian symmetry, cyclic prefix, and converted serial to parallel. The comparison result shows that the proposed architecture is better than existing in terms of hardware utilizations. The proposed OFDM transmitter requires almost 35% lesser hardware resources with respect to existing techniques.

Keyword

Inverse fast Fourier transform (IFFT), Quadrature amplitude modulation (QAM), Orthogonal frequency division multiplexing (OFDM), Transmitter, Cyclic prefix, FPGA implementation.

Cite this article

Refference

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