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Description: AODV和AOMDV路由协议性能仿真与分析:：使用NS一2仿真软件，选取分组投递率、端到端的平均时延、归一化的路由开销和路由发现频率4个指标对AODV和AOMDV
路由协议进行了性能仿真，通过改变业务源连接数目、节点的暂停时间分析比较这些参数对2个协议性能的影响，研究结果表明了AOMDV
多径协议的优越性。并提出了对AOMDV协议的改进。-AODV and AOMDV Routing Protocol Performance Simulation and Analysis:: Using NS-2 simulation software, select the packet delivery rate, the average end-to-end delay, normalized routing overhead and route discovery frequency of four indicators of AODV and AOMDV routing protocol performance simulation carried out by changing the number of operations to connect the source, node pause time analysis and comparison of these two parameters on the performance of the agreement, research results show that the multipath AOMDV the superiority of the agreement. And made improvements on AOMDV agreement.
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Size: 158720 |
Author: king |
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Description: 通过系统的cpu频率来获得比较精确的时间 可以到us ns-Cpu frequency through the system to obtain more precise time can be to us ns
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Size: 271360 |
Author: 张飞 |
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Description: 水下ns2 UnderWaterMiracle: Underwater Channel, PHY and MAC for NS-MIRACLE .-UnderWaterMiracle: Underwater Channel, PHY and MAC for NS-MIRACLE .
escription: we have developed a module for ns-miracle that allows a fully detailed simulation of the underwater channel, including frequency-dependent attenuation and noise, and the impact of temperature, salinity and depth on the propagation speed of acoustic waves.
Included in this model are also two underwater PHY models: one providing the maximum theoretical bitrate according to Shannon s theorem, and the other implementing a BPSK modulation scheme. Other PHY layer implementations can easily be developed.
Thanks to the PHY/MAC API included in Miracle, it is possible and also very easy to develop and test different MAC layers on top of the underwater PHY. Currently provided MAC protocols are ALOHA and FDMA.
The module can be downloaded here below. Please note that nsmiracle version 1.2.0 or above is required for the module to run.
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Size: 328704 |
Author: geful |
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Description: 时间函数，直接读取cpu时钟频率，时间精度到ns级-Function of time, direct read cpu clock frequency, the time to the ns-level accuracy
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Size: 1024 |
Author: 孙驰 |
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Description: 基于最小二乘法实现精确到采样点间的准确定时，性能远远高于双程测距方法实现的测距与定时。仿真表明此方法对于抗噪声和频偏具有很好的作用。这是源代码，用matlab编写，项目要求实现10ns的精度实际中我们实现了3ns以内的精度。-Based on least square method to achieve precise sampling points of accurate timing between, performance is much higher than the round trip distance method and timing range. The simulation shows that the method of noise and frequency for partial has very good effect. This is the source code, with matlab, project required to the accuracy of the actual 10 ns we realized the precision of the within 3 ns.
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Size: 144384 |
Author: lmy |
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Description: 衰落信道仿真
function r = rayleigh( fd, fs, Ns )
r = rayleigh(fd,fs,N)
A Rayleigh fading simulator based on Clarke s Model
Creates a Rayleigh random process with PSD determined
by the vehicle s speed.
INPUTS:
fd = doppler frequency
set fd = v*cos(theta)/lambda
v = velocity (meters per second)
lambda = carrier wavelength (meters)
theta = angle w/ respect to tangent (radians).
fs = sample frequency (Samples per second)
Ns = number of samples of the Rayleigh fading
process to produce
OUTPUTS:
r = row vector containing Ns samples of the Rayleigh
fading process
Author: Matthew C. Valenti
Mobile and Portable Radio Research Group
Virginia Tech
For Academic Use Only-Fading channel simulation
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Size: 3072 |
Author: zhouyi |
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Description: 主要包含了GPSR协议的源代码，gpsr.cc，gpsr.h，gpsr_sinklist.h，gpsr_sinklist.cc，gpsr_packet.h，gpsr_neighbor.h，gpsr_neighbor.cc，getratio.awk，frequency.awk，delay.awk，load.awk，throughtput.awk，4parameters.awk。运行脚本run.tcl，即自己建立的多种场景文件，在ns-2.35下运行得到结果。
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Size: 1950009 |
Author: 1006141124@qq.com |
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Description: 基于GPS的高精度时钟在线校频与授时研究.pdf,算法是基于最小二乘法的，同步精度达到-25-+25ns-Online GPS-based precision clock frequency and timing of the school, the algorithm is based on the least squares method, the synchronization accuracy reaches-25-+25 ns
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Size: 915456 |
Author: 沈宣佐 |
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Description: V/F变换和F/V变换采用集成块LM331，LM331是美国NS公司生产的性能价格比较高的集成芯片，可用作精密频率电压转换器用。LM331采用了新的温度补偿能隙基准电路，在整个工作温度范围内和低到4.0V电源电压下都有极高的精度。同时它动态范围宽，可达100dB；线性度好，最大非线性失真小于0.01％，工作频率低到0.1Hz时尚有较好的线性；变换精度高，数字分辨率可达12位；外接电路简单，只需接入几个外部元件就可方便构成V/F或F/V等变换电路，并且容易保证转换精度-V/F conversion and F/V conversion using Manifold LM331, LM331 NS produced in the United States high performance and low cost integrated chip, can be used as precision frequency voltage converter uses. LM331 with a new temperature compensated bandgap reference circuit, the entire operating temperature range and low to 4.0V supply voltage has a very high accuracy. Also it wide dynamic range up to 100dB linearity, maximum nonlinear distortion is less than 0.01 , the operating frequency low to 0.1Hz good linear fashion conversion of high precision, digital resolution up to 12 external circuit is simple , just a few external components to facilitate access to constitute V/F or F/V conversion circuit, etc., and is easy to maintain the conversion accuracy
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Size: 28672 |
Author: 尤辛 |
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Description: ns STBC for purely time-selective channels by transforming the
time-selective channels into frequency-selective channels, and by
adjusting existing space–time code designs over frequency-selective
MIMO channels to collect joint space–Doppler gains over purely
time-selective MIMO channels. Further, [14] uses the ideas of [12] to
develop a space–time code that can achieve full space-delay-Doppler
diversity for any number of transmit–receive antennas. However, to
quantify the maximum Doppler diversity order [2], the above papers
rely on a parsimonious critically sampled complex-exponential basis
expansion model (CCE-BEM) for the underlying purely time-selective
or doubly-selective channels [16]. However, the CCE-BEM may have
a large modeling error under certain channel conditions
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Size: 1024 |
Author: phuong |
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Description: To calculate a timeout in nanoseconds, the basic formula is ns = cycles_reset (NSEC_PER_SEC cpu frequency).
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Size: 3072 |
Author: plvaihan |
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Description: 硬件平台：红牛stm32F103ZE开发板，DDS模块：AD9910
软件版本：Keil 4
固件库版本：3.5
已完成功能：
（1）产生频率范围：1Hz - 400MHz 的正弦波（按键触发：开发板上 WAKEUP 按键）
（2）产生幅度范围：1mV - 650mV 的正弦波（初始化后为：500mV）
（3）产生上下限频率、频率步进（单位：Hz）、步进时间间隔（单位：us；输入范围：1-262us）可调的扫频波（按键触发：开发板上 USER1 按键）
（4）利用 RAM 调制模式产生方波：采样时间间隔为 4*(1~65536)ns（按键触发：开发板上 USER2 按键）
（5）理论上可用 RAM 调制模式产生任意波形。(Hardware platform: Red Bull stm32F103ZE development board, DDS module: AD9910.
Software version: Keil 4
Firmware library version: 3.5
Completed functions:
(1) produce frequency range: 1Hz - 400MHz sine wave (keypad trigger: WAKEUP button on development board).
(2) the amplitude range is 1mV - 650mV sine wave (initialization: 500mV).
(3) generation of upper and lower frequency, frequency step (unit: Hz), step time interval (unit: US; input range: 1-262us) adjustable sweep wave (key trigger: USER1 button on the development board)
(4) use RAM modulation mode to generate Fang Bo: the sampling interval is 4* (1~65536) ns (button trigger: USER2 button on the development board).
(5) theoretically, arbitrary waveform can be generated by RAM modulation mode.)
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Size: 310272 |
Author: NLQ |
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