| 引用本文: | 王荣,魏急波,程时昕.一种利用小波包函数调制的 MC-CDMA 及其性能.[J].国防科技大学学报,2000,22(4):69-75.[点击复制] |
| WANG Rong,WEI Jibo,CHENG Shixin.Performance of Multicarrier CDMA Modulated by Using Wavelet Packet Functions[J].Journal of National University of Defense Technology,2000,22(4):69-75[点击复制] |
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| 一种利用小波包函数调制的 MC-CDMA 及其性能 |
| 王荣1, 魏急波2, 程时昕1 |
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(1.东南大学移动通信国家重点实验室, 江苏 南京 210096;2.国防科技大学 电子科学与工程学院, 湖南 长沙 410073)
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| 摘要: |
| 将小波包变换理论应用于多载波码分多址(MC-CDMA)系统, 提出一种基于小波包函数的正交调制方法。系统中, 发端数据串并转换成若干子信道, 每个子信道的数据进行直序扩频, 不同子信道上的数据以 chip 调制不同的小波包函数作为基带传输波形。小波包函数的一系列优良性质, 使系统能有效地抗多径干扰, 抑制子信道串扰、多址干扰等。本文对系统在多径 Rayleigh 慢衰落信道中的性能, 进行了理论分析和计算机仿真。结果表明, 本系统比基于 DFT 的 MC-CDMA 有较大的性能改善。 |
| 关键词: MC-CDMA 小波包变换 干扰抑制 |
| DOI： |
| 投稿日期：1999-12-16 |
| 基金项目:国家863基金资助项目(863-317-12-9600) |
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| Performance of Multicarrier CDMA Modulated by Using Wavelet Packet Functions |
| WANG Rong1, WEI Jibo2, CHENG Shixin1 |
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(1.National Mobile Communications Lab., Southeast University, Nanjing 210096, China;2.College of Electronic Science and Engineering, National Univ. of Defense Technology, Changsha 410073, China)
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| Abstract: |
| A new scheme of orthogonal multicarrier CDMA based on wavelet packet functions is proposed. Transmitted data bits are serial to parallel converted to a number of parallel sub-channels. On each sub-channel each bit is spread by PN code. Each chip on different sub-channel modulate different wavelet packet functions. Good properties of wavelet packet functions ensure that the system can suppress multipath interference, inter-subchannel interference (ICI) and multiple access interference (MAI) effectively. The system performance is investigated for a multipath, slow Rayleigh fading channel. The performance advantages of the system over that based on DFT are demonstrated by both analytical and simulation methods. |
| Keywords: MC-CDMA wavelet packet transform interference suppression |
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