This paper first expatiates on the theory of software radio , discussing the multi - rate digital signal processing , high - speed data acquisitions , digital product detector and digital signal demodulation 首先从阐述软件无线电理论的基础入手，对多速率数字信号处理技术、高速数据采集、以及数字信号的正交分解和通信信号的解调技术进行了分析和探讨。
Then ， we complete the intermediate frequency digital acquisition and tracking circuits according to the band pass sample theory , digital signal processing theory , multiple rate signal processing theory and digital filter theory 接着，基于带通信号采样理论，数字信号处理理论，多速率信号变换理论，数字滤波器理论，设计出了中频数字捕获与跟踪电路。
The gaussian approximation method used in single traffic cdma system is introduced , at the same time the improved gaussian method also discussed for greater accuracy , when the active user load is small . however , the improved gaussian method needs more complicated calculations 研究gsc的结构以及其输入端信号的统计分布，为我们后面研究多速率扩频系统分集合并的gsc接收机作一些必要的数学准备。
This thesis firstly introduces sr base theory , which primarily including signal sampling theory , multi - speed signal processing theory , high - efficiency digital filter theory , signal ' s quadrant transform theory , then constitutes the sr receiver mathematic model 本文首先重点介绍了软件无线电中的基础理论，主要包括信号采样理论、多速率信号处理理论、软件无线电中的高效数字滤波理论、信号正交变换理论，建立了软件无线电接收机的数学模型。
First , the thesis introduced conception and characters of software radio ; second , the thesis analyzed architectures of software radio ; third , the thesis discussed critical technologies of software radio and applications of dsp in software radio , moreover , realized arithmetic of crc coding , convolution code , orthogonal digital frequency conversion and multi - speeds signal process ; finally , the thesis prospected foreground of software radio 本文首先介绍了软件无线电的概念和特征，接着分析了软件无线电体系结构，论述了软件无线电的关键技术及dsp在软件无线电中的应用，在tms320c54x上实现了crc编码、卷积码，完成了正交数字变频和多速率信号处理的dsp算法，最后展望了软件无线电的应用前景。
Firstly , this paper introduces the basic theory and the key technology of digital intermediate frequency system , secondly the method of the sampling rate conversion , multirate signal , and which is the important , essential theory in digital intermediate frequency system , is studied carefully . then it analyses the components of the flow chat . finally we simulated the designed system on spw and the properties of the system is make out 文章首先阐述了数字中频系统的基本思想、关键技术和发展概况,然后研究了数字中频系统涉及的数字信号处理理论,主要内容包括欠采样技术、多速率信号处理、正交变换理论与高效数字滤波技术,然后详细分析了数字中频系统的设计,并在spw仿真平台上加以实现,最后根据仿真结果分析了数字中频系统的性能。
With regard to the flow regulation of the best - effort traffic , the controllable traffic in high speed computer communication networks , the present paper proposes a novel control theoretic approach that designs a proportional - integrative ( pi ) controller based on multi - rate sampling for congestion controlling . based on the traffic model of a single node and on system stability criterion , it is shown that this pi controller can regulate the source rate on the basis of the knowledge of buffer occupancy of the destination node in such a manner that the congestion - controlled network is asymptotically stable without oscillation in terms of the buffer occupancy of the destionation node ; and the steady value of queue length is consistent with the specified threshold value 本文从控制理论的角度出发,针对计算机高速互联网中最大服务交通流即能控交通流的调节问题提出了一种基于多速率采样的具有比例积分( pi )控制器结构的拥塞控制理论和方法,在单个节点的交通流的模型基础上,运用控制理论中的系统稳定性分析方法,讨论如何利用信终端节点缓冲占有量的比例加积分的反馈形式来调节信源节点的能控交通流的输入速率,从而使被控网络节点的缓冲占有量趋于稳定;同时使被控网络节点的稳定队列长度逼近指定的门限值。
Linear phase prqmf banks is one of focal points in multirate digital signal processing domain , its general pr condition is deduced mathematically in the paper , which is important for further studying its design method , in addition high speed hybrid filter banks adc system , high effective hybrid filter banks adc system and high - speed - and - resolution time interleaved adc system proposed in the paper have practical value 线性相位prqmf滤波器组是当今多速率数字信号处理领域的研究热点之一，本文从理论上推导出了其理想重建的一般规律，这对进一步研究线性相位prqmf滤波器组设计理论有重要意义。此外，本文提出的高速混合滤波器组adc系统、高效混合滤波器组adc系统、高速高分辨率时问交织adc系统，均具有实用价值。
The main content of this thesis includes : ( 1 ) the introduction of theory of digitalization if receiver , including the theories on signal sampling , multi - velocity signal processing , pulse compress , and so on ; ( 2 ) design of system scheme based on system requirements , including confirm the sampling rate , design the decimation filters in digital down converter , and design the matching filters ; ( 3 ) analysis and discussion about the software and hardware implement schemes of digitalization if receiver and the pulse compression system , including the introduction and choice of chips , the realization of system module in fpga , design hardware circuit ; ( 4 ) presentation on the test results about our system based on fpga 本文的主要工作包括: ( 1 )介绍线性调频信号的数字中频接收的原理,主要包括信号采样理论,多速率信号处理理论,脉冲压缩理论等。 ( 2 )结合系统指标进行系统总体方案的设计和论证,包括采样率的确定,数字下变频各级抽取滤波的设计,以及匹配滤波的设计。 ( 3 )分析讨论并给出具有实用价值的线性调频脉冲雷达中频信号数字化接收及脉冲压缩处理系统的软硬件实现方案,包括芯片的选择和简介,系统各个模块在fpga中的实现,以及硬件电路的设计。
Consulting relevant reference and related theories in software radio , this thesis is working on technologies of digital channelized receivers , including the theories on a / d sampling , digital down converter , multi - velocity signal processing , polyphase filter and uniform dft filter bank 本文针对电子侦察系统数字化实现,对数字式信道化接收机的相关技术进行了研究:包括a / d采样的理论、数字下变频相关理论、多速率信号处理的理论、多相结构优化抽取滤波、均匀dft滤波器组。
