We mainly explore the realization scheme of base - band processing unit of data transmission system using fpga in this paper . with the research of the base - band processing unit and designing method of fpga , we detailedly explore convolutional coding and viterbi decoding , and accomplish the designing of base - band processing unit in fpga develop platform of altera company 论文对基带处理单元和fpga设计方法进行了相关研究,尤其对基带处理单元中卷积码编码和viterbi译码进行了深入的研究,并应用altera公司最新的fpga开发平台quartusii5 . 1完成了基带处理单元的设计。
Furthermore , we use the matlab simulation result to analyze the capability of viterbi decoding . finally , we complete the fpga designing of each module in the base - band processing unit , including parallel - to - serial conversion module , framing module , convolutional coding module in the sending end , serial to parallel conversion module , viterbi 基带处理单元各模块的fpga设计主要包括发送端并串转换模块、成帧模块、卷积编码模块、接收端串并转换模块和viterbi译码模块,应用quartusii5 . 1开发平台以及modelsim仿真软件,给出了仿真结果。
It has many benefits due to its ultra - wideband nature which including the following : not sensitive to channel fading , low transmit power , extremely difficult to intercept , low complexity of transceiver structure , fine range resolution ( centimeter scale ) for location and so on this paper combines uwb technology and mobile ad hoc network technology , concerting the lasn project of national key laboratory of communication , researchs the baseband process cell of uwb communication transceivers on the base of arithmetic research and spot test 本文结合uwb技术和移动自组织网( manet ,即mobileadhocnetwork )技术,配合通信抗干扰技术国防重点实验室uwb技术研究项目“ lasnproject ”的工作进展,在算法研究和现场测试的基础上,对uwb通信节点样机的基带处理单元进行设计研究。样机结构包含三大模块:天线、用分立器件形成的射频电路、由fpga构建的基带处理单元。
As a key technolege of wcdma , baseband processing is difficult . the baseband processing is very important to the whole wcdma system . this paper concerns the baseband downlink symbol rate processing of the wcdma , including commond processing module , tti module , adm module , initial module and dsp driver 本论文主要关注wcdma基带处理系统下行子系统的符号级处理的实现,从命令处理模块、调度模块、初始化模块、业务处理模块以及dsp的底层驱动几个方面对下行符号级处理dsp进行了详细的说明。
Firstly , the differences between a qpsk system and a tcm - 8psk system , and the difficulties in the latter ’ s realization are considered in detail , including the frequency band utility , the group delay effects , the filters ’ implementation , the base band processing and some key technologies 首先考虑了tcm - 8psk系统与传统的qpsk系统的不同,以及在实际工程中会遇到的一些困难。包括从整个系统方面考虑的带宽利用率问题、群延迟问题、滤波器问题和基带处理等问题,以及实现这样一个系统的几种关键技术。
Then the several parts of the system , just as antenna , transmitter , receiver and base - band processing are researched one by one , especially , the key technologies of the system , as the tdas antenna of geo - leo link , mixer , local oscillator , demodulation and inspect technology , and benchmark demodulation technology are analyzed detailed 同时对星间链路的几大部分：天线、发射机、接收机、基带处理进行了研究，尤其是对geo - leo链路的tdas天线、混频器、本振、解调和检测技术、基准解调等关键技术进行了分析。
This test divides four chapters : the first chapter introduces the basic concept and development conditions of the software defined radio ; the second one discusses the key technique of the software defined radio , its technique challenges and the resolve . the third one discusses the 3g rtt and the apply of the software defined radio in the 3g rtt ; the fourth one studies the application of the software defined radio architecture that based on the dsp to realize the base band disposal module of the terminal in the 3g then the test presents a kind of gsm / td - scdma terminal architecture and analyses the circuit of the front part , then it also analyses the resource need . moreover , it also presents the hardware architecture of the td - scdma base band module and the flow of the software arithmetic . it also analyses the realization of the module key arithmetic , finally it brings forward some points that should be paid much attention in realizing the module 本文分为四章：第一章介绍了软件无线电的基本概念、发展状况；第二章研究了软件无线电的关键技术及所面临的技术上的挑战和解决办法；第三章探讨了第三代移动通信技术中的无线接入以及软件无线电在其中的应用；第四章研究了应用基于dsp的软件无线电技术来实现第三代移动通信终端的基带处理模块，并分析了其前端电路，然后对它的资源需求做了分析，给出了td - scdma基带模块的硬件结构和软件算法流程，对模块的关键算法的实现进行了分析，最后提出了实现模块应当注意的几个问题。
The aim of personal mobile communication is communicating with anybody by any information at any time and any place . from anolog to digital , from voice to data , from tdma to fdma to cdma , personal communication is developing rapidly . wcdma is a real 3g communication system , as one of the three mainstream 3g communication system standars . the corn net of wcdma is based on gsm , and wcdma is a real global standar Wcdma是应运而生的全新第三代移动通信系统方案,作为三大主流3g标准之一,是真正意义上的3g ,传输速率完全可以达到384kbps 。 wcdma基于gsm核心网,是真正的全球标准。作为wcdma关键技术之一的基带处理技术,其底层系统的实现是一大难点。
First , this paper gives a method , which is utilized by baseband system according to wcdma system capability requirements , using asic + dsp to realize raker , using dsp + dsp to realize symbol process . the hardware structure of asic + dsp and dsp + dsp is designed from the whole design view . then , the discussion is made of the main function module of ic2001 and dsp , hi module , dsp peripherals on chip such as hpi , edma and emif 文章首先结合wcdma系统性能要求提出了基带系统所采用的方案,由asic + dsp实现rake接收机功能和dsp + dsp实现符号级处理功能;然后从总体规划的角度设计出asic + dsp和dsp + dsp系统硬件结构,对ic2001和dsp的主要功能模块, hi模块, dsp片上外设hpi口、 edma和emif总线作了分析,并结合基带处理功能开发了系统驱动;最后由信号源发出测试数据进入系统,进行功能实现后输出数据绘制出波形图,对所设计的基带系统驱动方案进行验证分析。
Combining the software radio system with the idea of broadband mid - frequency sampling , the paper puts forward the feasible structure plot of software radio receiver system based on direct mid - frequency sampling nowadays . then the working principle of each module is analyzed , including radio frequency processing , middle frequency processing and base - band processing 结合软件无线电的体系结构和宽带中频带通采样的思想，提出了现阶段可行的直接中频采样软件无线电接收机的系统结构框图，并且分析了各个模块的工作原理，包括射频处理、中频处理以及基带处理等。
