PAPR Reduction of Optical OFDM Systems with Exponential Companding Transform and Zero Padding Public Deposited

http://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/c534fs25f

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  • Optical wireless communication (OWC) is an alternative to radio frequency (RF)communication with a signi cantly larger and unregulated spectrum. In OWC systems, optical orthogonal frequency division multiplexing (O-OFDM) with intensity modulation and direct detection (IM/DD) is commonly used. There are two common signal structures in most OWC systems based on IM/DD OFDM. One is called DC-biased optical OFDM (DCO-OFDM) and the other one is called asymmetrically clipped optical OFDM (ACO-OFDM). One drawback of an OFDM signal is its high peak-to-average power ratio (PAPR), which requires the transmitter to operate in a large dynamic range to retain all desirable information. To reduce the PAPR,companding transform has been investigated. Because of the nonlinear operation of companding, a high electrical signal-to-noise ratio (SNR) is required. In this thesis, a combination of an exponential companding transform and a zero padding scheme is employed on both DCO-OFDM and ACO-OFDM systems to reduce PAPR and the required electrical SNR. Systems that employ quadrature amplitude modulation (QAM) with gray mapping are simulated. Results have shown that the optimized DCO-OFDM and ACO-OFDM reduced the PAPR by about 7dB and 11dB, respectively, through exponential companding. Meanwhile, the required SNR is decreased by approximately 10dB in the optimized DCO-OFDM and by approximately 13dB in the optimized ACO-OFDM by using zero padding.
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  • description.provenance : Approved for entry into archive by Laura Wilson(laura.wilson@oregonstate.edu) on 2016-03-24T18:43:04Z (GMT) No. of bitstreams: 2 license_rdf: 1232 bytes, checksum: bb87e2fb4674c76d0d2e9ed07fbb9c86 (MD5) DeyanChen2016.pdf: 2152726 bytes, checksum: 226bdabcc60246074b68bfd636e2c2e1 (MD5)
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