| Summary: | 碩士 === 國立中正大學 === 通訊工程研究所 === 95 === An OFDM signal consists of a high number of independently
modulated sub-carriers, which may exhibit a high instantaneous signal
peak power with respect to the average signal power. Thus, the pressure
for communication system needs to cope with the enormous bit error rate
(BER) because of the high peak-to-average power ratio (PAPR), which
significantly reduces the transmission efficiency.
Different users with different needs, the demand for high speed
mobile wireless communication is rapidly growing, the OFDM
technology must promise a high data capacity and spectral efficiency
requirements for wireless communication system for now and future.
Chapter 1 introduced the OFDM basics. Chapter 2 discussed the
PAPR problems in OFDM transmission system and introduced two PAPR
reduction techniques to reduce the high peak-to-average power ratio. One
is the active channel extension (ACE) method, and the other is dummy
symbol insertion (DSI) method. Chapter 3 proposed an improvement of
DSI method and a novel idea which is a combination of ACE and the
proposed DSI techniques. Chapter 4 and 5 shows the comparisons and
conclusions.
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