DFT Spreading Research Papers - Academia.edu (original) (raw)
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The next generation of mobile communication is based on OFDM technology. It is an efficient method of data transmission for high speed communication system. Orthogonal frequency division multiplexing (OFDM) systems have been proposed in... more
The next generation of mobile communication is based on OFDM technology. It is an efficient method of data transmission for high speed communication system. Orthogonal frequency division multiplexing (OFDM) systems have been proposed in the recent past years for providing high spectral efficiency, less vulnerability to echoes, low implementation complexity and resistance to non linear distortion .However the main drawback of OFDM system is high peak to average power ratio (PAPR) of transmitted signals due to inter-symbol interference between the subcarriers as a result the amplitude of such a signal can have high peak values. Thus a power amplifier must be carefully manufactured to have a linear input output characteristics or to have large input output back-off. Drawback of high PAPR is that dynamic range of power amplifier and Digital to Analog (D/A) converter during the transmission and reception of the signal is higher. As a result total cost of transceiver increases with reduced efficiency. Discrete Fourier Transform (DFT) Spreading is one of the schemes to reduce the PAPR problem in OFDM system by using different subcarrier mapping schemes. In this paper we proposed combination of DFT spreading technique with FEC coding to reduce PAPR in OFDM system. Performance evaluation carried out in terms of SNR (signal to noise ratio) BER (bit error rate).