Title :
A Novel Method Based DCT to Reduce PAPR of OFDM Systems
Author :
Sun Shanlin ; Hou Chunping ; Yan Lei ; Fu Jinlin
Author_Institution :
Tianjin Univ., Tianjin
Abstract :
Orthogonal frequency division multiplexing (OFDM) systems based on discrete cosine transform (DCT) is proposed for the first time in this paper in order to solve the distortion due to great Peak-to-Average Power Ratio (PAPR) of OFDM systems signals. The character of the DCT energy focused is made use of in the frequency domain, and it helps to reduce the PAPR engendered by IFFT at the transmitter statistically, avoiding the nonlinear distortion in OFDM systems due to great change of PAPR. In this paper, the characters of DCT algorithm are analyzed first, and then the algorithm is applied to signal processing in OFDM systems. It is mathematically verified that this method is potent to reduce the PAPR. Lastly, the simulation results show that the proposed scheme in reducing the threshold of PAPR statistically is feasible.
Keywords :
OFDM modulation; discrete cosine transforms; fast Fourier transforms; mobile radio; nonlinear distortion; discrete cosine transform; inverse fast Fourier transforms; nonlinear distortion; orthogonal frequency division multiplexing; peak-to-average porer ratio; Degradation; Digital video broadcasting; Discrete cosine transforms; Fading; Frequency domain analysis; Nonlinear distortion; OFDM; Peak to average power ratio; Signal processing algorithms; Transmitters;
Conference_Titel :
Wireless Communications, Networking and Mobile Computing, 2008. WiCOM '08. 4th International Conference on
Conference_Location :
Dalian
Print_ISBN :
978-1-4244-2107-7
Electronic_ISBN :
978-1-4244-2108-4
DOI :
10.1109/WiCom.2008.229
