| 一种利用小波包函数调制的 MC-CDMA 及其性能 |
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| 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. |
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| 作者姓名： | 王荣 魏急波 程时昕 |
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| 作者单位： | 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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| 基金项目： | 国家科技攻关项目，863-317-12-9600， |
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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.
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| 关 键 词： | MC-CDMA 小波包变换 干扰抑制 |
| 收稿时间： | 1999/12/16 0:00:00 |
Performance of Multicarrier CDMA Modulated by Using Wavelet Packet Functions |
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| WANG Rong,WEI Jibo and 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. |
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| Authors: | WANG Rong WEI Jibo and CHENG Shixin |
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| Affiliation: | 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;1.National Mobile Communications Lab., Southeast University, Nanjing 210096, 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. |
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| Keywords: | MC CDMA wavelet packet transform interference suppression |
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