| 1. | Ddc technology based on band - pass sampling
基于带通采样的数字下变频技术 |
| 2. | Digital down converter is one of the key technology of the sdr
数字下变频是软件无线电中的关键技术之一。 |
| 3. | One is the digital down conversion . the method of look - table is described in detail
其一是数字下变频算法，重点说明了其中的查表法及其推广。 |
| 4. | Being based on the theory of the sdr , the topic researched the actual model of ddc
本课题以软件无线电的理论为基础，研究了数字下变频的实际处理模型。 |
| 5. | Digital down converter ( ddc ) is one of the core technologies in the software defined radio ( sdr ) receiver
数字下变频( ddc : digitaldownconvert )技术是软件无线电接收机的核心技术。 |
| 6. | Therefore , a method in design and fpga implementation of wideband digital if receivers based on polyphase filters to fulfill decimation and filtering is proposed
本文正是基于这种目的，研究并设计了基于软件无线电技术的中频数字接收机的数字下变频。 |
| 7. | Frequency estimation technology and bandpass filtering , which are named as wideband digital downconversion technology , are the key technologies to realize data rate conversion system
测频技术以及带通滤波,即宽带数字下变频技术,是实现数据率转换系统的关键技术。 |
| 8. | This paper presents a method of realization of numeric transducer using tms320c542 dsp . the program of numeric down - transducer and multi - rate sampling is given
摘要在tms320c542数字信号处理器上，用查表方法实现了dsp数字变频器，并给出相关的数字下变频和多抽样率信号处理程序。 |
| 9. | Conventional ddc down - converts digitally by digital mixing , filtering , and decimating ; on condition of high - speed a / d converters , the commercial ddc is no longer applicable
传统的ddc通过数字混频、滤波、抽取实现数字下变频，在高速a d和电子侦察环境条件下商用ddc不能使用。 |
| 10. | As a result , some key technologies of sdr such as modulation , demodulation , ddc and dug have been hot topics . in this paper , some key technologies of sdr are researched deeply
于是，软件无线电中的一些关键技术，例如：调制解调技术，数字上变频，数字下变频等成为该领域的研究热点。 |
