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.
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.
在接收信号的数字化、软化的实现中，数字下变频起着重要的作用。
Digital downcoversion plays a key role in the digitized and software-oriented process of the received signal.
数字下变频在接收系统的数字化和软件化过程中起到了至关重要的作用。
Digital down conversion plays a key role in the digitized and software-oriented process of the receiver system.
提出了一种数字下变频的FPGA实现方案，实现了高速、高性能的数字下变频。
DDC method based on FPGA is put up in this paper, which is realized with a high speed and a high performance.
在此基础上，介绍了中频数字采样单元和基于FPGA的数字下变频单元的具体设计。
Based on these elements, the material design of if sample and digital down converter based on FPGA is specified.
在信号的中频数字接收过程中，数字下变频、载波频率与相位跟踪是设计的关键所在。
In the process of signal digital intermediate-frequency received, digital down convertion, frequency tracking of carrier and phase locked loop are the keys.
最后给出了FPGA实现的数字下变频器在测试中产生的波形和频谱，作了测试结果分析。
At the end of this paper, waves and spectra generated by FPGA DDC during tests are given and test results are analyzed.
在宽带数字接收机中，高速数据流的实时处理对后继数字下变频器性能提出了极为苛刻的要求。
The real time processing of high speed data flow makes strict demands on the performance of descendant digital down converter in the wideband digital 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.
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.
介绍了数字直接合成器 （DDS）、数字下变频器 （DDC）、数字滤波器等数字无线电经常用到的概念 。
We also introduced some concept of digital radio, including digital direction synthesizer (DDS) and digital down conversion (DDC) and digital filter.
随后在风云二号气象卫星中频全数字解调器总体结构方案的基础上，对数字下变频和定时同步部分进行了重点研究。
Then, based on the overall structure of the IF all-digital demodulator for FY-2 meteorological satellite, the digital down conversion and the timing synchronization are deeply researched.
本文研究了窄带信号条件下，高倍抽取的数字下变频设计，重点分析了基于CIC滤波器和HB滤波器的多级抽取算法。
This paper studies high decimation ratio of digital downconverter given narrow-band signal, and especially analyze mul? stage decimation algorithm based on CIC filter and HB filter.
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.
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.
最后，基于FPGA对数字下变频进行了设计及实现，具体包括：算法仿真、VHDL描述、FPGA仿真和实际系统测试。
At last, this thesis realizes digital down converter based on FPGA, and the whole designing process includes algorithm simulation, VHDL description, FPGA simulation and real system test.
在软件方面，主要介绍了数字下变频器的参数设置、接收系统的应用软件设计以及系统核心芯片ADSP2191的监控软件设计。
In the software design, the parameter setting of digital down converter, the application program of this receiving system and the design of ADSP2191 "s monitoring program are mainly introduced."
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.
研究了高倍抽取的数字下变频设计，重点分析了基于级联积分梳状滤波器、级联补偿滤波器、级联根升余弦滤波器的多级抽样频率算法。
In this paper, the high decimation ratio of digital down converter is studied and the multi-stage decimation algorithm is especially analyzed based on CIC filter, CFIR filter and RRC filter.
介绍了软件无线电的基本思想及结构，提出了一种基于可编程数字下变频器HSP50214B的中频软件无线电接收系统的设计方案。
The basic concept and architecture of software radio is introduced in this paper. And a type of software radio receiver based on programmable digital down converter (DDC) -hsp50214b is presented.
板上多达四路高速AD采样及四片数字下变频专用芯片ISL5416的使用，最终使接收机有多达16路数字下变频通道，信号通路灵活多变。
There are totally 16 DDC channels, which are realized with four pieces of AD and four pieces of DDC ASIC named ISL5416. The signal channels become flexible in this way.
模块的硬件设计主要包括：A／D转换器、数字下变频器（DDC）以及DSP，详尽讨论了A／D 器件AD6640和DDC 器件AD6624的设计和应用；
The design of hardware module includes A/D converter, DDC (Digital Down Converter) and DSP. The design and application of AD6640 and AD6624 are fully discussed in this part.
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.
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.
论文在最后给出了在处理机实验平台上进行的数字上下变频系统的实验结果。
The last part gives the test results of digital up convert and digital down convert system, produced by the experimental platform.
论文在最后给出了在处理机实验平台上进行的数字上下变频系统的实验结果。
The last part gives the test results of digital up convert and digital down convert system, produced by the experimental platform.
应用推荐