| 1. | Dds ( direct digital frequency synthesis ) can just solve this problem , yet the output has an upper bound and high wideband spurs
Dds (直接数字频率合成)的出现恰好可以弥补这一缺陷,但是它输出频率上限太低,宽带杂散大。 |
| 2. | The thesis used a fully digital method that employed the principle of direct digital frequency synthesis to realize the modulation based on dsp
本文采用了完全数字化的方法，是利用直接数字频率合成技术的原理，并基于dsp的系统实现msk调制。 |
| 3. | Secondly , the principle and direct digital frequency synthesis ( dds ) is analyzed deeply . thirdly , the whole system is designed according to the design flow
其次，对实现原理和在设计中需要用到的直接数字频率合成技术进行了深入的分析。 |
| 4. | Direct digital frequency synthesis ( dds ) is a new frequency synthesizing technique which is developed rapidly in recent years
直接数字频率合成( dds )是近年来得到迅速发展的一种新兴频率合成技术，它具有频率精度高、切换速度快、相位连续等优点。 |
| 5. | Aim at the development of the software radio in generalization , standardization and modularization , a waveform synthesis solution based on direct digital frequency synthesis is developed
针对国内外软件无线电技术对通用、标准、模块化的硬件平台的需求，本文提出了一种基于直接数字频率合成原理进行信号数字域调制的波形合成器设计方案。 |
| 6. | 13 eltawil a m , daneshrad b . interpolation based direct digital frequency synthesis for wireless communications . conference record of the 2002 ieee wireless communications and networking conference wcnc 2002 , vol . 1 , mar . 2002 , pp . 73 - 77
本文针对0 . 18微米6层umc cmos工艺的标准单元asic设计实现，给出了几个面向未来电信与多媒体系统映射的常用数字信号处理算法及实现结果。 |
| 7. | In this kind spread spectrum modulator , we use direct digital frequencies synthesis ( dos ) and digital signal processors ( dsp ) chip as the key parts of spread spectrum modulator , by controlling the out of dos to achieve the goal of modulating with dsp
在这种扩频调制器中，使用数字信号处理器( dsp )和直接数字频率合成芯片( dds )作为调制器的核心部分，用dsp控制dds的输出来达到调制的目的。 |
| 8. | The direct digital frequency synthesis ( dds ) is a kind of new frequency synthesis method and also a revolution in the frequency synthesis techniques . with the development of digital integrated circuits and microelectronic techniques , dds exhibits its advantages day by day
直接数字频率合成( dds ? digitaldirectfrequencysynthesis )是一种新的频率合成方法，是频率合成技术的革命，随着数字集成电路和微电子技术的发展， dds技术日益显露出它的优越性。 |
| 9. | It discusses some kinds of basic frequency synthesis technology such as direct , phase - lock , digital and direct digital frequency synthesis , then give the performance index of the frequency synthesis , and discusses the digital frequency synthesis technology in detail
讨论了直接式频率技术、锁相式频率合成技术、数字式频率合成技术、直接数字频率合成技术等几种基本频率合成技术，给出的衡量频率合成技术的各种性能指标，并对全数字频率合成技术作了较详细的讨论。 |
| 10. | This paper mainly discuss the basic principles of this sub - subject , namely software radio technology , reconfigurable technology , direct digital frequency synthesis ( dds ) technology . this paper articulate the ways to realize the test signal resource in details based on my researching experiences and show the results of simulation and test
本文主要讨论了本课题所涉及的基本理论，即软件无线电技术、可重组技术、直接数字频率合成技术（ dds ） ，结合自己在工作中的经验，详细阐述了测试信号源的实现方法，并给出了仿真结果和测试结果。 |
