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- Type of Document: M.Sc. Thesis
- Language: Farsi
- Document No: 46772 (05)
- University: Sharif University of Technology
- Department: Electrical Engineering
- Advisor(s): Mashhadi, Saeed
- Abstract:
- Orthogonal Frequency Division Multiplexing (OFDM) is a digital transmission method developed to meet the increasing demand for higher data rates in communications which can be used in both wired and wireless environments. This thesis describes the issue of the Peak to Average Power Ratio (PAPR) in OFDM system, based on compressed sensing at the receiver of a peak-reducing sparse clipper applied to an OFDM signal at the transmitter. By choosing proper clipping threshold, clipping signal will be sparse so locations, magnitudes, and phases of the clipping signal can be recovered by compressed sensing method. We demonstrate that in the absence of optimization algorithms at the transmitter, original OFDM signal can be recovered reliably with low complexity.
Different methods of clipping are presented. Better estimation of clipping signal is achieved by weighting coefficients of clipping signal. In another approach phase of clipping signal is estimated by information of transmitted signal in channel and then amplitude of it is estimated by compressed sensing. Finally by presenting another approach, first positions of nonzero coefficients of clipping signal is estimated by compressed sensing and then amplitude and phase of it is estimated by MMSE and LS - Keywords:
- Optical Orthogonal Frequency Division Multiplexing (OFDM) ; Compressive Sensing ; Peak to Average Power Ratio ; Sparse Signal Processing
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