| 基于小波包变换的多载波系统的仿真分析 |
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| 引用本文： | 王飒爽,戴居丰,侯春萍. 基于小波包变换的多载波系统的仿真分析[J]. 电子测量与仪器学报, 2007, 21(2): 58-61 |
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| 作者姓名： | 王飒爽 戴居丰 侯春萍 |
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| 作者单位： | 天津大学电子信息工程学院,天津,300072;天津大学电子信息工程学院,天津,300072;天津大学电子信息工程学院,天津,300072 |
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| 基金项目： | 本项目为国家自然科学基金资助项目（编号：60372084）. |
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| 摘 要： | 由于基于傅立叶变换的正交频分复用（OFDM）的多载波系统频谱旁瓣较大，为克服符号间干扰（ISI）需加入循环前缀，从而降低系统的频谱利用率。为了提高频谱利用率，改善系统性能，文中设计了一种基于小波包变换的多载波系统，对该系统在各种无线信道下的传输性能进行了分析，并与基于傅立叶变换的OFDM系统相比较。本文的基于小波包变换的多载波系统的信道调制，采用了各种不同的正交小波和双正交小波，仿真结果表明小波的正交性交将影响系统的性能。
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| 关 键 词： | 小波包变换 多载波系统 正交频分复用 小波包基 |
| 修稿时间： | 2005-09-01 |
Simulation on Wavelet Packet-Based Multi -carrier System |
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| Wang Sashuang,Dai Jufeng,Hou Chunping. Simulation on Wavelet Packet-Based Multi -carrier System[J]. Journal of Electronic Measurement and Instrument, 2007, 21(2): 58-61 |
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| Authors: | Wang Sashuang Dai Jufeng Hou Chunping |
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| Affiliation: | School of Electric Information Engineering, Tianjin University ,Tianjin 300072, P. R. China |
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| Abstract: | Orthogonal frequency division multiplexing (OFDM) system based on Fourier transform has high sidelodes and needs to insert a cyclic prefix (CP) to avoid inter symbol interference (ISI). However, adding CP will decrease the bandwidth efficiency greatly. To improve power spectrum efficiency, a wavelet packet based multi-carrier system is proposed and analyzed in this paper. Comparisons are made between wavelet packet based multi-carrier system and OFDM system based on Fourier transform in different wireless channels. In this paper, we also use various orthogonal and bi-orthogonal wavelets as sub-channel modulation waveform. Simulation results show that the orthogonality of different wavelets will influence the performance of the system. |
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| Keywords: | wavelet packet transform multi-carrier system orthogonal frequency division multiplexing wavelet packet base. |
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