| 正交复用QAM群带数据调制解调器的设计 |
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| 引用本文： | 张灯银.正交复用QAM群带数据调制解调器的设计[J].南京邮电大学学报(自然科学版),1996(4). |
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| 作者姓名： | 张灯银 |
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| 作者单位： | 南京邮电学院计算机工程系 |
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| 摘 要： | 正交复用ＱＡＭ（ＯＱＡＭ）系统传输效率可以接近奈奎斯特速率，并对传输媒介引起的时延和幅度失真不敏感。应用数字信号处理技术可以大大减少其电路实现的复杂性。本文提出用离散余弦变换（ＤＣＴ）级联一权重网络实现ＯＱＡＭ群带数据调制解调器。文中给出的ＦＩＲ滤波和ＤＣＴ算法与Ｈｉｒｏｓａｋｉ提出的方案相比较，运算复杂性降为３５．６％。
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| 关 键 词： | 数据调制解调器，正交复用QAM，离散余弦变换 |
Design of Groupband Data Modem Using OQAM Technique |
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| Zhang,Dengyin.Design of Groupband Data Modem Using OQAM Technique[J].Journal of Nanjing University of Posts and Telecommunications,1996(4). |
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| Authors: | Zhang Dengyin |
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| Institution: | Zhang Dengyin Department of Computer Engineering,Nanjing Institute of Posts and Telecommunications,210003,Nanjing,PRC |
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| Abstract: | The orthogonally multiplexed QAM(OQAM) system allows transmission speed very close to the Nyquist rate with little sensitivity to the delay and amplitude distortions introduced by the transmission medium.Its circuit complexity can be largely overcome by digital signal processing (DSP).In this paper,the implementation of groupband data modem using OQAM technique is presented,where OQAM system is realized by means of cascading a discrete cosine transformer (DCT) and a weighting network.The proper algorithm of evaluating FIR filter and DCT provides further reduction of the computation complexity which drops to 35.6 percent of that of Hirosaki's scheme. |
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| Keywords: | Data modems Orthogonally multiplexed QAM Discrete cosine transform |
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