Abstract
High peak to average power ratio (PAPR) is a limiting factor towards the performance of an OFDM system. Selected Mapping (SLM) is a popular peak to average power ratio (PAPR) reduction scheme used with the OFDM systems. In this technique, U set of candidate sequences are generated that leads to improvement in the PAPR reduction ability of the OFDM systems. The major concern of the conventional SLM is that as the number of candidates is increased, there is a proportional rise in the inverse fast Fourier transforms (IFFT) computations of the systems. In our article we have proposed a scheme in which we increase the number of candidate sequence as (U+U2/4) that leads to improved PAPR performance of the OFDM systems without any equivalent rise in the IFFT computations. It has been demonstrated that both the simulation and analytical results are well-approximated in our proposed schemes. We also estimate the threshold value of PAPR at a fixed value of complementary cumulative distribution function (CCDF) for different number of subcarriers and candidate sequences. Results demonstrate that our proposed scheme outperforms in terms of PAPR reduction ability of the OFDM signal and obtains effective PAPR threshold values with negligible loss in BER performance of the system.
Highlights
Orthogonal frequency Division Multiplexing (OFDM) is a high speed multicarrier modulation scheme that is widely used in many of the wireless application standards such as Digital Video Broadcasting (DVB) [1], IEEE 802.11a and IEEE 802.16d based Wimax broadband access [2]
Green-OFDM [15] was proposed to overcome the limitation of Selected Mapping (SLM)-OFDM systems by increasing the number of candidates that results in improvement in the peak to average power ratio (PAPR) reduction ability of the OFDM signals
Using various computer simulations we demonstrate the PAPR performance, effects of the PAPR threshold for different values of subcarriers and sub-bands at a fixed value of complementary cumulative distribution function (CCDF)=10-3, and the BER performance of our proposed scheme with the conventional SLM and the existing GreenOFDM schemes
Summary
Orthogonal frequency Division Multiplexing (OFDM) is a high speed multicarrier modulation scheme that is widely used in many of the wireless application standards such as Digital Video Broadcasting (DVB) [1], IEEE 802.11a and IEEE 802.16d based Wimax broadband access [2]. In [15] GreenOFDM Algorithm is proposed to improve the PAPR reduction capability of the OFDM signals with the same number of IFFT computations as in conventional SLM-OFDM. In this scheme the number of candidates is increased by dividing the input data into two groups each containing U/2 candidates and merging to generate (U2/4) set of candidates. In [17] authors use the PSK modulated signal sequences, orthogonal phase factor sets and deformation parameter set to increase the number of candidate signals thereby improving the PAPR performance of the OFDM system.
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