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Research on PAPR Technology of Wavelet Packet Multicarrier Modulation System

Author: ChengZhiBing
Tutor: ZhangKeFeng
School: Huazhong University of Science and Technology
Course: IC Engineering
Keywords: Threshold algorithm Wavelet Packet Multi - carrier modulation PAPR
CLC: TN919.3
Type: Master's thesis
Year: 2011
Downloads: 25
Quote: 0
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Abstract


With the rapid development of the Internet , as a high-speed wireless communications broadband technology multicarrier modulation technique , orthogonal frequency division multiplexing (OFDM) technology has become the current hot issues . Resistance to multipath fading characteristics and high spectrum efficiency , OFDM technology has been considered the key technologies of the fourth -generation mobile communications . Wavelet Packet Modulation (Wavelet Packet Modulation, WPM) and OFDM is similar to the multi - carrier modulation technique , is also a practicable . It has a high bandwidth utilization, and the flexibility to select the adaptive channel coding scheme . WPM technology in wireless mobile communication , such as in areas such as Wi-Max and OFDM compete in the field of cognitive radio has unlimited potential . However , in OFDM field , a prominent issue is the high peak to average power ratio ( PAPR ) , this problem in the WPM technology inside is still very serious , a great impact the WPM popularization and application of the technology . The OFDM field have been proposed a variety of PAPR suppression algorithm , which is only one small part of WPM technology can be applied to . This paper presents a novel lower peak average power ratio method, which make full use of the advantages of wavelet packet energy is always concentrated in certain sub - carrier . When to set a different threshold value T , the range and the BER performance of a PAPR suppression have carried out a detailed discussion of research . Wavelet packet based multi-carrier system from two aspects of theory and simulation show that the method can effectively reduce the PAPR value . In this article all the simulation work is carried out based on the Haar wavelet , since we use characteristics have the characteristics of all of the wavelet , so this method also can be applied to other wavelet . We can conclude that the threshold is set to a method can effectively reduce the PAPR of wavelet packet multicarrier modulation system . PAPR to the study and analysis of algorithms , wavelet packet multicarrier modulation system PAPR problem has certain reference value .

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