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PEAK TO AVERAGE POWER RATIO (PAPR)IN OFDM

Platform : DSP

IEEE Projects Years : 2007

This paper appears in: Vehicular Technology, IEEE Transactions on Issue Date: March 2007 AIM: To study the peak to average power ratio in OFDM ABSTRACT Orthogonal-frequency-division-multiplexing (OFDM) techniques allow the transmission of high data rates over broadband radio channels subject to multipath fading without the need for powerful channel equalization. However, they are very sensitive to nonlinear effects due to the high peak-to-average power ratio (PAPR) owned by their transmitted signals. This paper proposes an efficient technique for reducing the PAPR of OFDM signals. The proposed technique is data-independent and, thus, does not require new processing and optimization for each transmitted OFDM block. The reduction in PAPR of the OFDM signal is obtained through a proper selection of a precoding scheme that distributes the power of each modulated symbol over the OFDM block. The obtained results show that this precoding scheme is an attractive solution to the PAPR problem of OFDM signals. It is shown, through computer simulations, that the PAPR of precoded OFDM signals approaches that of single-carrier signals. The good improvement in PAPR given by the present technique permits the reduction of the complexity and cost of the transmitter significantly. The precoding schemes also take advantage of the frequency variations of the communication channel and can provide considerable performance gain in fading-multipath channels LEARNING OBJECTIVE: To Study efficient technique for reducing the PAPR of OFDM signals INPUT: (Encoding algorithm for reduction of PAPR for) speech signal OUTPUT : Decoded Speech signal APPLICATIONS: Speech Processing SOFTWARE TOOL USED: MATLAB 2007A

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