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URN etd-0818111-010159 Statistics This thesis had been viewed 1863 times. Download 867 times. Author Tzu-ting Huang Author's Email Address No Public. Department Communication Engineering Year 2010 Semester 2 Degree Master Type of Document Master's Thesis Language zh-TW.Big5 Chinese Page Count 67 Title A Study of PAPR reduction by using the combination of Precoding and Nonlinear Companding Method in OFDM system Keyword symbol scrambling technique PAPR Precoding Nonlinear compading Nonlinear compading Precoding PAPR symbol scrambling technique Abstract The Orthogonal Frequency Division Multiplexing (OFDM) is a multi-carrier modulation scheme that provides efficient bandwidth utilization and high-speed data transmission. One of the major drawbacks is that the OFDM signal would generate high peak-to-average power ratio (PAPR).
“Precoding” is one of symbol scrambling technique of PAPR reduction and compared with other scrambling techniques of SLM and PTS; this method has best capability of PAPR reduction and lower computational complexity. Pilot subcarrier is the best important parameter in OFDM system for channel estimation. However, Pilot subcarrier inserted into OFDM system which impacted to the PAPR reduction. This paper study other simple and practical method combined with “Preceding” method to improvement when pilot inserted effect to the PAPR reduction degradation problem. This paper proposed combination of Precoding and Nonlinear Companding Method to improve the PAPR reduction when Pilot subcarrier was insertion.
Advisor Committee Chau-yun Hsu - advisor
Teng-pin Lin - co-chair
Tsung-ming Lo - co-chair
Files Date of Defense 2011-07-27 Date of Submission 2011-08-21