提出了一种基于多相滤波的宽带数字下变频技术。
This paper proposes a technique of wideband digital down-convert based on polyphase filtering.
数字下变频技术是软件无线电中的关键技术之一。
Digital down converting is one of the key technologies of software radio.
数字下变频技术是软件无线电中的关键技术之一。
Digital variable frequency is a key technology of soft radio.
数字下变频技术是数字化雷达接收机的关键技术之一。
Digital down - conversion (DDC) is an important technique of digitized radar receiver.
在此基础上，提出了数字下变频技术在可编程数字下变频器HSP50214 B中的应用方案。
On the base of these, the paper analyzes applications of digital down converting in the HSP50214B programmable downconverter.
数字下变频技术的基本功能是将宽带高速数据流信号转变成窄带低速数据流信号，以便DS P实时处理。
The basic function of digital down-conversion technology is to transfer wideband high speed data signals into narrowband low speed data signals, so that DSP can process them in real time.
本文第一章介绍了第三代移动通信系统的现状，分析软件无线电中的数字下变频技术的研究现状，简单介绍了WCDMA。
The first chapter introduce the 3G actuality , analyze the digital-down converting's research actuality in software radio and introduce WCDMA briefly.
接收部分主要是扩频系统的数字下变频、积分清洗、匹配滤波器解扩、功率检测、符号跟踪、差分译码等技术。
The receiver unit mainly consisted of the digital down converter, matched filter, integration and dump module, power detector, symbol tracking processor, differential demodulator and so on.
结合无线电遥测接收机的设计，论述和分析了软件无线电技术中的数字下变频和调频数字解调技术在遥测接收机中的应用。
Combining to devise radio telemetry receiver, the application of digital down converter and frequency demodulation in software radio is discussed and analysed.
DSP和数字上变频和下变频技术是构建高频雷达通用硬件平台的关键技术。
The DSP, Digital Up Converter ( DUC ) and Digital Down Converter (DDC ) are key technology of a hardware-platform.
本文主要研究的是基于现场可编程逻辑阵列（FPGA）的数字上下变频技术的设计和实现。
This paper deals with the design and implementation of Digital Up Conversion and Digital Down Conversion based on the field-programmable gate array (FPGA).
为了对软件无线电进行探索性研究，本论文主要研究了软件无线电接收机中的部分关键技术：包括数字下变频算法，多通道并行接收的信道化模型以及调制解调部分的实现。
In order to make a research on the software radio, this thesis focuses on key techniques for radio receiver including: DDC technology, the channelization model, modulation and demodulation algorithm.
本文提出了一种基于数字下变频(DDC)技术的快速局部细化频谱分析的方法，并探讨了算法实现中的关键步骤和需要注意的问题。
A zoom - FFT implementation based on the technology of digital down convert (DDC) is introduced in this paper. The key process and core problem of this method are discussed in detail.
全数字化接收机是实现软件无线电技术的重要基础，本文研究基于可编程四通道数字下变频器HSP5 0 2 16实现高频地波雷达数字接收机设计的若干关键技术。
The fully digitalized receiver is the important basis for software radio. Some key technologies about how to realize the HF ground wave radar receiver based on the HSP50216 are addressed.
全数字化接收机是实现软件无线电技术的重要基础，本文研究基于可编程四通道数字下变频器HSP5 0 2 16实现高频地波雷达数字接收机设计的若干关键技术。
The fully digitalized receiver is the important basis for software radio. Some key technologies about how to realize the HF ground wave radar receiver based on the HSP50216 are addressed.
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