The first chapter , introduce the rf receiver ’ s devolop and current situation . the second chapter , introduce the effect of the exterior environment to the rf receiver . the third chapter introduce some different structure and the design parameters of each structures . the parameters of the rf receiver are introduce in fourth chapter . the fifth chapter design a s band rf receiver . this s band rf receiver use a structure of superheterodyne module 第五章,介绍了一种s波段射频接收前端的设计,基于分析的结果对一种射频接收机的低噪放大、下变频、锁相环( pll )频率合成器、中频agc电路进行了设计,并在第六章完成了接收机各组件及总体的测试。
The paper begins with a profound analysis of software radio theory if digital receiver technique , pci bus system . brings forward an if digitalization receiver architecture , introduce the power and clock , adc , ddc , control part cpld , process part fpga , data buffer part in detail , gives the simulation of fpga and cpld . then introduces the pcb design , and process si simulation , gives the conclusion at the end 本文首先介绍了软件无线电以及中频数字化接收机的相关理论,其次,介绍了该中频数字化接收机的实现方案,详细说明本接收机中电源和时钟、 ad转换、数字下变频、控制芯片cpld 、处理芯片fpga 、数据缓冲等各模块的设计,给出fpga和cpld的仿真结果,然后,介绍了印刷电路板( pcb )设计,初步对pcb进行信号完整性分析( si )仿真,最后给出结论。
This system is based on two altera ’ s statixii series fpga chips ep2s180f1020c5 , and the tunner dtt7579 and the chip ad9433 , together composed the main hardware platform . the hardware description system running on the fpga is the core of digital down converted sysgtem , synchronization system , estimation and equalization of channel system , 3780 - point fft ofdm demodulation system , frequency equalization system and ldpc decoding 以两片altera公司的stratixii系列ep2s180f1020c5级联为基础构建了系统主硬件处理平台,结合汤姆逊公司的调谐器dtt7579以及ad9433组成了系统的硬件构架fpga可描述硬件系统的核心任务包括数字下变频,同步和信道均衡与估计, 3780点fftofdm解调,频域均衡, ldpc解码。
Transmit / receive ( t / r ) modules is the base of the modern radar . the paper puts forth a design scheme according to the target including t / r switch , up conversion , power amplified , low noise receive and down conversion . the dimension is restricted to 106 89mm through scheme comparison and the existing experiment condition , the final products arrive at the target we expect with millimeter hybrid integrated circuit 收发t / r组件在当今雷达系统中占有举足轻重的地位,本文根据设计指标提出了毫米波前端的设计方案,系统功能上要求完成收发双工、上变频和功率放大、低噪声放大和下变频功能,外形尺寸为106 89mm ,通过综合方案比较,结合自身条件,选取了毫米波混合集成电路形式。
And the implementations in fpga of each composition are also completed . the rapidly frequency estimation algorism in the short data condition are implemented in fpga to get the band position . pipeline has been used in this dissertation to advance the performance 结合多相滤波下变频结构、算法对测频精度及速度的要求，提出了短数据快速测频算法的具体实现，使用流水线的设计方法，提高了系统的数据吞吐率，在尽可能短的时间内提供多相滤波下变频所需的载频位置信息。
Secondly , basing on single channel if sr receiver mathematic model , this thesis has designed if sr receiver subsystem and brought forward its design project and system circuit principle diagram , and explained the system working principle . furthermore , this thesis introduces the working principles and respective applications of wideband high - speed adc ad6640 , ddc ad6620 and high - speed dsp tms320c6713 according with the if sr receiver subsystem high - speed analog digital conversion department , digital down conversion department and high speed digital signal processing department . thirdly , the thesis emphatically demonstrates the software realization department of the if sr receiver subsystem , which including ad6620 ' s inner parameter software setup , tms320c6713 data transmission and processing and the quadrant demodulation algorithm program realization 其次，基于单通道中频软件无线电接收机数学模型，本文设计了中频( if ， intermediatefrequency )软件无线电接收机子系统，给出了中频软件无线电接收机子系统的设计方案和系统电路原理图，说明了系统工作原理，并分别对应系统中的高速模数转换部分、数字下变频部分、基带数字硕士学位论文软件无线电理论研究及中频软件无线电接收机子系统设计信号处理部分，介绍了高速adcad664o ，数字下变频器( ddc ， digitaldownconverter ) ad6620 ，高速数字信号处理器( dsp ， digitalsignalproeessor ) tms320c6713的工作原理，以及它们在中频软件无线电接收机子系统中的应用。
