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URN etd-0217104-105720 Statistics This thesis had been viewed 2524 times. Download 1432 times. Author Te-Jen Wang Author's Email Address email@example.com Department Communication Engineering Year 2003 Semester 1 Degree Master Type of Document Master's Thesis Language English Page Count 68 Title REDUCTION OF THE PAPR IN OFDM SIGNALS BY APPLYING PTS MECHANISM Keyword PTS PAPR OFDM OFDM PAPR PTS Abstract Recently, the requirement of personal mobile communication became more and more important, and the Wireless Local Area Network(WLAN) technology is widely adopted by laptop PC and other portable devices such as webpad and smart display. In order to meet the requirement of higher bandwidth and efficiently within the limited frequency channel, Orthogonal Frequency Division Multiplexing(OFDM) technology is discussed and researched by scientists for a long time. OFDM technology is also proved with a good performance under the digital broadcasting channel. There are some controversy between 8-VSB and OFDM as the standard of Taiwan’s Digital TeleVision(DTV) standard, but OFDM became the final DTV standard for its good anti-multipath performance in fading channel and good receiving performance in mobile mode.
Since OFDM signal is composited by many sub-carrier signals, the instant power variation is very huge at some time. The large instant power variation will cause the power amplifier difficult to design, and the other problem is that will cause the power amplifier inefficiently. If the system performance is bad, the battery life will be a fatal issue when the device is under portable or mobile application.
The main goal of this thesis is to discuss the different schemes on the reduction of OFDM signals. Within these schemes, we selected the Partial Transmit Sequences(PTS) scheme to discuss and simulate. From the simulation, we found that PTS scheme is a good scheme to reduce the PAPR of OFDM signal, but the extra calculation cost and time delay is a good topic for future research.
Advisor Committee Jie-Cherng Liu - advisor
Chau-yun Hsu - co-chair
Ching-huang Wei - co-chair
Files Date of Defense 2004-01-09 Date of Submission 2004-02-17