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Description: 发送方背靠背发送UDP包。接收方接收后，分别提取接收包的时间，前后两包相减得到延迟。包的大小除延迟得到瓶颈带宽。-The sender sends a UDP packet back to back. After receiving the recipient, receiving packets were extracted from the time before and after subtracting two packets of delay. In addition to the size of the packet delay to get the bandwidth bottleneck.
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Size: 2048 |
Author: wan |
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Description: end-to-end bandwidth estimation for TCP.
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Size: 3072 |
Author: huikovon |
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Description: 本系统由前级宽带放大模块、增益控制模块、无源衰减模块、功率放大模块和直流稳压电源模块组成，具有0~60dB范围内手动连续调节、带宽为0.3M~100MHz的功能。在前级放大中，采用两片宽带低噪声放大芯片ADA4895级联对输入信号进行放大，然后由800MHz带宽的可变增益放大器AD8368进行放大倍数调节，最后通过低噪声电流反馈运放THS3001进行功率放大，从而达到1V有效值输出。在系统设计中，采用了合理的阻抗匹配，规范的高频线路布局和有效的散热设置，并且综合考虑了去耦、滤波，以及使用同轴电缆屏蔽干扰，减少了高频信号的噪声和自激，全面提高了系统的稳定性。-The system consists of pre-broadband amplifier module, gain control module, passive attenuation module, power amplifier module and DC power supply modules, with manual within the range of 0 ~ 60dB continuously adjustable, 0.3M ~ 100MHz bandwidth capabilities. The first amplification stage, using two wideband low-noise amplifier chip ADA4895 cascade amplification of the input signal, and the bandwidth of 800MHz for the variable gain amplifier AD8368 magnification adjustment, the final amplifier THS3001 feedback current through the low-noise power amplifier to achieve 1V RMS output. In the system design, the use of a reasonable impedance matching circuit layout and specifications of the high frequency effective heat setting, and considering the decoupling, filtering, and the use of shielded coaxial cable interference and reduce high-frequency noise from the signal and excited, and comprehensively improve the stability of the system.
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Size: 390144 |
Author: 刘欣怡 |
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Description: 频率域GPS信号和热噪声仿真波形
码频率1.023MHZ
2M带宽CA码、热噪声 线性偏差波形生成
-Frequency-domain simulation of GPS signals and thermal noise waveform
Code frequency 1.023MHZ
2M bandwidth CA code, thermal noise, linearity deviation waveform generation
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Size: 5120 |
Author: 陈鲤文 |
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Description: SplitStream tree-based 组播算法-SplitStream: High-bandwidth content distribution in cooperative en vironments
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Size: 47104 |
Author: lianzhiqun |
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Description: a multiplexer (or mux) is a device that selects one of several analog or digital input signals and forwards the selected input into a single line. A multiplexer of 2n inputs has n select lines, which are used to select which input line to send to the output. Multiplexers are mainly used to increase the amount of data that can be sent over the network within a certain amount of time and bandwidth. A multiplexer is also called a data selector.
An electronic multiplexer makes it possible for several signals to share one device or resource, for example one A/D converter or one communication line, instead of having one device per input signal.
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Size: 6144 |
Author: Pradeep |
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Description: The APB is part of the AMBA 3 protocol family. It provides a low-cost interface that is optimized for minimal power consumption and reduced interface complexity. The APB interfaces to any peripherals that are low-bandwidth and do not require the high performance of a pipelined bus interface. The APB has unpipelined protocol. All signal transitions are only related to the rising edge of the clock to enable the integration of APB peripherals easily into any design flow. Every transfer takes at least two cycles.
The APB can interface with the AMBA Advanced High-performance Bus Lite (AHB-Lite) and AMBA Advanced Extensible Interface (AXI). You can use it to provide access to the programmable control registers of peripheral devices.-The APB is part of the AMBA 3 protocol family. It provides a low-cost interface that is optimized for minimal power consumption and reduced interface complexity. The APB interfaces to any peripherals that are low-bandwidth and do not require the high performance of a pipelined bus interface. The APB has unpipelined protocol. All signal transitions are only related to the rising edge of the clock to enable the integration of APB peripherals easily into any design flow. Every transfer takes at least two cycles.
The APB can interface with the AMBA Advanced High-performance Bus Lite (AHB-Lite) and AMBA Advanced Extensible Interface (AXI). You can use it to provide access to the programmable control registers of peripheral devices.
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Size: 250880 |
Author: psn026 |
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Description: 正交频分复用（OFDM）是一种通过快速傅里叶变换实现的多载波宽带数字调制技术。相比一般的数字通信系统。它具有频带利用率高和抗多径干扰能力强等优点，因而适合于高速率的无线通信系统。正交频分复用 OFDM 是第四代移动通信的核心技术。论文首先简要介绍了OFDM基本原理。在给出OFDM系统模型的基础上,用MATLAB语言实现了整个系统的计算机仿真并给出参考设计程序。-Orthogonal frequency division multiplexing (OFDM) is a fast Fourier transform of the multi-carrier wideband digital modulation through. Compared to the general digital communication system. It has high bandwidth efficiency and resistance to multipath interference ability, etc., which is suitable for high-speed wireless communications systems. Orthogonal frequency division multiplexing (OFDM) is a core technology of fourth generation mobile communication. Firstly, brief introduction to the basic principles of OFDM. On the basis of a given OFDM system model, using MATLAB language to achieve a computer simulation program and gives the reference design of the entire system.
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Size: 4096 |
Author: 张生 |
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Description: SIMULATION OF NETWORK TOPOLOGY USING NS2
Consider the network where T1-T6 are transmitters and R1-R6 are receivers. R1 receives
from T1, R2 receives from T2 and so on. B1,B2 and B3 act as bottleneck nodes and also
provide for routing of packets. Consider queuing systems as RED for B1,SFQ for B2 and
FIFO for B3.
Queue length of B1and B2 = 1000
Queue length of B3 = 2000
Bandwidth of Ti-Bi links = 200 kbps
Bandwidth of B1-B3 link and B2-B3 link = 500 kbps
Bandwidth of B3-Ri links = 200 kbps
Simulate the above topology using NS2 and study the e ect of bottleneck bandwidths
on interarrival time and throughput using the generated trace le.
Write an awk script to nd the desired parameters and plot them using gnuplot for
di erent values of bottleneck bandwidths.
3
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Size: 125952 |
Author: sac kaus |
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Description: 数据通信实验 信号及带宽
验证包括数字信号在内的任意信号可由若干正弦波叠加而成
通过实验证明，模拟信号的带宽对的数字化数据抽样频率有着重要影响-Any signal bandwidth of data communication test signals and digital signals, including verification by including a number of sine wave superposition proved by experiments, the bandwidth of digital data sampling frequency of the analog signal has an important impact
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Size: 739328 |
Author: daniel |
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Description: 掌握双线性变换法及脉冲相应不变法设计IIR数字滤波器以及窗函数法设计FIR数字滤波器的原理，具体方法及计算机编程。 2.观察双线性变换法，脉冲响应不变法及窗函数法设计的滤波器的频域特性，了解各种方法的特点。 3.用MATLAB画出三种方法设计数字滤波器的幅频特性曲线，记录带宽和衰减量，检查是否满足要求-Master bilinear transform and impulse response invariance IIR digital filter design and window function design FIR digital filter theory, specific methods and computer programming. 2. Observe bilinear transform, impulse response and frequency domain characteristics unchanged Act designed filter window function, understanding the characteristics of the various methods. 3 Draw three methods using MATLAB design of digital filter frequency characteristic curve, record the amount of bandwidth and attenuation, check meets the requirements
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Size: 1024 |
Author: liyanping |
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Description: 针对核密度估计背景建模方法运算量大难以实时应用的问题，提出了一种基于背景直方图分布的快速核密度估计背景建模方法。选用三角核函数进行核密度估计，根据三角核带宽函数的截断效应，引入背景分布的直方图完成快速背景建模，在保证目标检测准确性的同时提高运算速度。测试实验结果验证了算法能够满足监控系统的实时性要求。-For kernel density estimation is difficult to satisfy real-time applications because of large amount of calculation, this paper
proposes a fast kernel density estimation method of background modeling based on the background histogram. Triangle kernel function
is used to estimate the kernel density. According to the triangular truncation effect of kernel-bandwidth function, background samples
histogram is built to complete the fast background modeling. The accuracy of target detection is ensured while processing speed is increased.
Experimental results prove that the algorithm satisfies the real-time requirements of surveillance systems
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Size: 1409024 |
Author: |
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Description: AD9245 是AD 公司推出的一款14 位高速模数转换器。AD9245 具有最高80MSPS 采样率、工作带宽500MHZ。文中介绍了AD9245 的主要特点及其典型的应用电路,并给出了一个软件无线电数字中频接收系统样机中的应用实例。-AD9245 is AD the company introduced a 14-speed ADC. AD9245 80MSPS with the highest sampling rate, bandwidth 500MHZ. This paper describes the main features of AD9245 and its typical application circuit, and gives a digital IF receiver software radio system prototype application examples.
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Size: 669696 |
Author: 曾维 |
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Description: 设计一个 20Hz~20KHz 范围内的频谱分析仪（用计算机声卡）；
要求：
1） 用计算机声卡实时采集语音信号，并实时显示时域波形信号；
2） 可以从计算机中读取语音信号文件，并能够实时显示时域波形信号；
3） 实现对信号进行幅度上的放大、缩小显示，存储等；
4） 实时显示信号的频谱，信号的频谱分辨率可以进行设置；
5） 采用常见的低通、高通、带通、带阻（50Hz）滤波器对信号进行滤波，滤波器阶数可调，带宽可调，观察信号频谱的变化；
6） 对信号频谱进行非实时高分辨率分析；
7） 编制 GUI 用户界面，能够在用户界面上实现上述所有功能。
8） 其它功能可参考商用 FFT 分析仪添加；
-Design a spectrum analyzer 20Hz ~ 20KHz range (with a computer sound card)
Requirements:
1) with the computer s sound card real time voice signal acquisition and real-time display time-domain waveform signal
2) You can read the speech signal files from your computer, and the time-domain waveform signal can be displayed in real time
3) realize the magnitude of the signal amplification on the narrow display, storage, etc.
4) Real-time display spectral resolution signal spectrum, the signal can be set
5) using a common low pass, high pass, band pass, band stop (50Hz) signal filtering filters, filter order adjustable, adjustable bandwidth, observed changes in the signal spectrum
6) for non-real-time high-resolution signal spectrum analysis
7) the preparation of GUI user interface, to achieve all of the above functions in the user interface.
8) Other functions can be added with reference to commercial FFT analyzers
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Size: 620544 |
Author: 李凯 |
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Description: 提出了一种新的宽带DOA估计方法:频域子空间正交性测试方法(TOFS:Test of orthogonality of frequency sub- space)。该方法通过同时测试频域信号共同带宽内各频段噪声子空间与阵列流形之间的正交性来进行DOA估计。与宽带相干信号子空间方法不同,TOFS方法不需要任何初始值的预估及聚焦操作。与宽带非相干信号子空间方法也不同,TOFS方法同时测试各频段噪声子空间与阵列流形之间的正交性。本文仿真了TOFS与IMUSIC、CSSM、TOPS的性能比较。仿真结果表明TOFS方法在中等信噪比以上时有较好的性能,且避免了TOPS方法中常出现的伪峰。 -Proposed a new broadband DOA estimation methods: subspace orthogonal frequency domain test methods (TOFS: Test of orthogonality of frequency sub-space). The method by simultaneously testing the frequency domain signal bandwidth of each band noise common sub-orthogonality between space and the array manifold to be DOA estimates. And broadband coherent signal subspace different methods, TOFS method does not require any initial estimate and focusing operation values. And broadband incoherent signal subspace methods are different, TOFS method for simultaneous testing of each band orthogonal noise subspace and the array manifold between. This paper compares the performance TOFS simulation and IMUSIC, CSSM, TOPS is. Simulation results show that the method TOFS better performance when more moderate SNR and spurious peaks TOPS method avoids the often occur.
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Size: 442368 |
Author: yushuhua |
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Description: Memory arbiter functions. Allocates bandwidth through the arbiter and sets up arbiter breakpoints.
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Size: 4096 |
Author: rehingwui |
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Description: 进行绘制不同带宽和中心频率的复小波频谱图-Draw different bandwidth and center frequency of complex wavelet spectrum
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Size: 1024 |
Author: 王东 |
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Description: MPEG Compression for sending file in wireless sensor network using High bandwidth
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Size: 133120 |
Author: Shyam Prasad |
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Description: While the required reliability of the sensing
process can be expressed in terms of rarely enough overlooking the PU, we assume that the proper QoS for the SU is given by maintaining — with a given confidence level — a minimum
bandwidth availability for the SU in spite of PU dynamics. In this paper we present an overview of approaches which might be used
to achieve these objectives. In addition we point out, that both the sensing process and the secondary link maintenance (necessary to keep the required bandwidth in spite of e configuration due to detected PUs) require a significant spectrum overhead. We identify and elaborate a fundamental tradeoff in using these
overheads in either sensing or link maintenance, and present examples of its optimization.
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Size: 189440 |
Author: isaacmu |
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Description: 1、根据干扰总功率要求，在PSK调制信号带宽内产生单音干扰和多音干扰信号，并叠加到产生的信号源上。
2、将收到干扰的信号进行频率搬移到基带，然后通过匹配滤波器以及解调过程得到信息，统计误码率并与真实信息的解调误码率进行对比，评估音频干扰对PSK信号的干扰效果。
-1, according to the total power requirement of interference generated tone signal interference and multi-tone interference in the PSK modulated signal bandwidth, and superimposed on the signal generated by the source. 2, the received interference signal to a baseband frequency shift, and the information obtained by the matched filter and a demodulation process, statistical error rate BER and the true information demodulation comparison, evaluation of the PSK signal, audio interference interference effects.
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Size: 1024 |
Author: 启政 |
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