Description: 本次实验是无线楼宇数据传输仿真，即在楼内实现点对点的无线数据通信，需要获得的关键是两点之间的距离和楼层衰减。通过了解914M的楼宇通信特性，建立楼宇数据通信系统的仿真模型，采用无线收发芯片NRF905,实现楼宇内的数据通信仿真分析。 -this experiment is building wireless data transmission simulation, in the building of peer-to-peer wireless data communications, need, the key is the distance between two points and the floor attenuation. 914 M by understanding the communication characteristics of the buildings, the establishment of building data communications system simulation models, adoption of wireless transceiver chip NRF905 achieve buildings on the simulation analysis of data communications. Platform: |
Size: 10425 |
Author:qinyang |
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Description: 本次实验是无线楼宇数据传输仿真，即在楼内实现点对点的无线数据通信，需要获得的关键是两点之间的距离和楼层衰减。通过了解914M的楼宇通信特性，建立楼宇数据通信系统的仿真模型，采用无线收发芯片NRF905,实现楼宇内的数据通信仿真分析。 -this experiment is building wireless data transmission simulation, in the building of peer-to-peer wireless data communications, need, the key is the distance between two points and the floor attenuation. 914 M by understanding the communication characteristics of the buildings, the establishment of building data communications system simulation models, adoption of wireless transceiver chip NRF905 achieve buildings on the simulation analysis of data communications. Platform: |
Size: 10240 |
Author:qinyang |
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Description: ① 设计并制作一个主站，传送一路语音信号，其发射频率在30MHz~40MHz之间自行选择，发射峰值功率不大于20mW(50 假负载电阻上测定)，射频信号带宽及调制方式自定，主站传送信号的输入采用话筒和线路输入两种方式；
② 设计并制作一个从站，其接收频率与主站相对应，从站必须采用电池组供电，用耳机收听语音信号；
③ 当传送信号为300Hz~3400Hz的正弦波时，去掉收、发天线，用一个功率衰减20dB左右的衰减器连接主、从站天线端子，通过示波器观察从站耳机两端的接收波形，波形应无明显失真；
④ 主、从站室内通信距离不小于5米，题目中的通信距离是指主、从站两设备(含天线)间的最近距离；
⑤ 主、从站收发天线采用拉杆天线或导线，长度小于等于1米。
-① design and production of a main station, all the way to send voice signals, the firing frequency at 30MHz ~ 40MHz to choose between the launch peak power less than 20mW (50 load resistance on the determination false), radio frequency signal modulation bandwidth and self- , the main station to send signals using the microphone input and line input in two ways
② design and production of a slave, to receive the frequency corresponding to the main station, from the station battery power must be used with headphones to listen to voice signals
③ When the transmission signal of 300Hz ~ 3400Hz sine wave, the removal of land, the antenna, with a power attenuation of about 20dB attenuator connecting to the main, from the antenna terminal station through the oscilloscope to observe from the headset on both ends of the receiving station waveform, waveform should no significant distortion
④ owners, interior communication distance from the station is not less than 5 meters, the Platform: |
Size: 629760 |
Author:liusixue |
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Description: 本程序实现了对无线电覆盖的3D仿真，包括反射效应的2D模拟以及基于接收端与发射端距离的功率衰减。并实现基于Matlab的3D仿真。-The program 3D simulation of radio coverage, including 2D simulation based on the receiving end and the transmitter end distance power attenuation of the reflection effect. And to achieve the 3D simulation based on Matlab. Platform: |
Size: 29696 |
Author:王宇 |
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Description: 无线传感器网络定位用到的无线传输模型
Regular Model, Logarithmic Attenuation Model, DOI Model, RIM Model
-Wireless sensor network localization using wireless transmission model, Regular Model, Logarithmic Attenuation Model, DOI Model, RIM Model
Achieve functional distance and transmission attenuation swap
~~~~~~~~~~~~~~~~~~~~~~Regular Model~~~~~~~~~~~~~~~
In this model, the radio range is a circle
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
ReceivedSignalStrength=SendingPower-PathLoss
e.g, RSS=Pt-Pl(d0)-10*η*log10(dist/d0)
Pt:transmit power
pl(d0):the pass loss for a reference distance of d0
ηis the path loss exponent
above parameters are saved in ../Parameters_Of_Models.mat
dist:distance between sender and receiver(m)
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
typical value:Pt=0-4dBm(max),Pl(d0)=55dB(d0=1m),η(2~4)=4(indoor,outdoor)
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
~~~~~~~~Logarithmic Attenuation Model~~~~~~~~~
In this model, the radio range is a circle
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
ReceivedSignal Platform: |
Size: 135168 |
Author:liangzhongfa |
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Description: MATLAB function to initialize and call the solve_sps2d
function, which implements a 2-D solution of
the nonlinear wave equation using a psuedospectral
/ staggered A-B method, including attenuation modeled
with two relaxation mechanisms.
This example demonstrates harmonic generation
within a plane wave given a B/A parameter of 5.2.
To increase the distance of propagation, scale the
sample grid (num_axpts) by a factor(s) of 2.- MATLAB function to initialize and call the solve_sps2d
function, which implements a 2-D solution of
the nonlinear wave equation using a psuedospectral
/staggered A-B method, including attenuation modeled
with two relaxation mechanisms.
This example demonstrates harmonic generation
within a plane wave given a B/A parameter of 5.2.
To increase the distance of propagation, scale the
sample grid (num_axpts) by a factor(s) of 2. Platform: |
Size: 19456 |
Author:youngdd7 |
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Description: 可视化的声场以上的本地反应阻抗平面。
：你可以进行选择
- 声压相对于距离为1的自由场声压在分贝再1。
- 声压的相位。在学位。
- 过量衰减：总声压，只能用直接的声压分。以dB为单位重1。正值表示衰减（声压比在自由场低级）
- 现场阻抗（相对于空气的特性阻抗）。
- 垂直（表面法）粒子速度。以dB为单位重新1。
- Horizotal（表面平行）粒子速度。以dB为单位重新1。
- 垂直（z）的比率horizotal速度（R）。以dB为单位重新1。
表面阻抗假定了一个exp（一IWT）的时间依赖性，
因此，大多数阻抗将产生积极的虚部。-Sound_Field.m
-------------
Visualizes the sound field above a locally reacting impedance plane.
You can choose between:
- Sound pressure relative to the free field sound pressure at distance 1. In dB re 1.
- Phase of the sound pressure. In degree.
- Excess attenuation: Total sound pressure divided by direct sound pressure only. In dB re 1. Positive values mean attenuation (sound pressure is lower than in a free field)
- Field impedance (relative to characteristic impedance of air).
- Vertical (surface normal) particle velocity. In dB re 1.
- Horizotal (surface parallel) particle velocity. In dB re 1.
- Ratio of vertical (z) to horizotal velocity (R). In dB re 1.
The surface impedance assumes an exp(-iwt) time dependency,
therefore most impedances will have a positive imaginary part. Platform: |
Size: 19456 |
Author:李云 |
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Description: 水声传播衰减的射线理论传播衰减示意图，可绘制不同声源深度关于距离的声线传播图-Ray attenuation of sound propagation theory spread water attenuation diagram can be drawn in different source depth chart on sound propagation distance line Platform: |
Size: 4096 |
Author:cloud |
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Description: 通过计算分析输出信号的自相关函数利用基于自相关函数的方法来估计衰减系数和延迟，并利用快速傅里叶变换将回波信号滤除回声，得到原声音信号，同时根据延迟估计反射物的距离。-Analysis by calculating the autocorrelation function of the output signal utilizing the autocorrelation function based method to estimate the attenuation coefficient and a delay, and the use of fast Fourier transform to filter out the echo echo signals to obtain the original audio signal, while the delay of the estimated reflector distance. Platform: |
Size: 1024 |
Author:sakuraxu |
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Description: 在一个移动通信系统中，发射信号是一个未调制的音频x(t)=cos(2πft)，其中f=f0+fi。设标称载波为f0=1GHz，并设fi =512Hz。假定移动用户在一个繁忙的高速公路上距离基站l公里处的地方，从开始从每小时60公里的速度开始，其速度（在0.01秒的时间间隔内测量）以1/2的概率随机的增加或减少1/10公里每小时。试仿真移动用户在这2s的时间间隔内所接收到的信号(及其频谱)。接收信号可以表示为：
y(t)=a(t)Cos[2π(fo+f1)(t-△t)]
式中 △(t)=d(t)/c
且 a(t)=k/d2(t)
在上面的表达式中d(t)是在t时刻基站与移动用户的距离，c是光速，△(t)是传播延迟，而a(t)是信号在t时刻的衰减，并假设在这2s内a(t)是一个常数。利用复低通等效模型来进行仿真。-In a mobile communication system, the transmitted signal is an unmodulated audio x (t) = cos (2πft), where f = f0+ fi. Let nominal carrier of f0 = 1GHz, and set fi = 512Hz. Assume that mobile users on a busy motorway station l kilometers place, starting the beginning of 60 kilometers per hour, the speed (measured in 0.01 second interval) to increase the probability of a random 1/2 or reducing 1/10 km/h. Simulation test signal which the mobile subscriber in the 2s time intervals of the received (and its spectrum). The received signal can be expressed as:
y (t) = a (t) Cos [2π (fo+ f1) (t- △ t)]
Where △ (t) = d (t)/c
And a (t) = k/d2 (t)
In the above expression, d (t) at time t is a base station and a mobile user s distance, c is the speed of light, △ (t) is the propagation delay, and a (t) is the attenuation of the signal at time t, and assuming that 2s within a (t) is a constant. Using complex low-pass equivalent model for emulation. Platform: |
Size: 2048 |
Author:何希 |
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Description: 信号处理中的旋转不变子空间法，考虑雨衰 阴影 和多径影响，主要为数据分析和统计，IDW距离反比加权方法，仿真效率很高的，实现了对10个数字音的识别。- Signal Processing ESPRIT method, Consider shadow rain attenuation and multipath effects Mainly for data analysis and statistics, IDW inverse distance weighting method, High simulation efficiency, To achieve the recognition of 10 digital sound. Platform: |
Size: 7168 |
Author:pjdbpa |
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Description: LDPC码的完整的编译码，可以广泛的应用于数据预测及数据分析,基于欧几里得距离的聚类分析，最终的权值矩阵就是滤波器的系数，包括广义互相关函数GCC时延估计，使用混沌与分形分析的例程，考虑雨衰 阴影 和多径影响。- Complete codec LDPC code, Can be widely used in data analysis and forecast data, Clustering analysis based on Euclidean distance, The final weight matrix is ??the filter coefficient, Including the generalized cross-correlation function GCC time delay estimation, Use Chaos and fractal analysis routines, Consider shadow rain attenuation and multipath effect. Platform: |
Size: 10240 |
Author:zvvsxarnk |
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Description: 正确率可以达到98％，通过虚拟阵元进行DOA估计，连续相位调制信号(CPM)产生，微分方程组数值解方法，包含CV、CA、Single、当前、恒转弯速率、转弯模型，基于欧几里得距离的聚类分析，考虑雨衰 阴影 和多径影响，借鉴了主成分分析算法（PCA）。- Accuracy can reach 98 , Conducted through virtual array DOA estimation, Continuous phase modulation signal (CPM) to produce, Numerical solution of differential equations method, It contains CV, CA, Single, current, constant turn rate, turning model, Clustering analysis based on Euclidean distance, Consider shadow rain attenuation and multipath effects It draws on principal component analysis algorithm (PCA). Platform: |
Size: 10240 |
Author:wwdybrg |
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Description: 基于kaiser窗的双谱线插值FFT谐波分析，利用matlab GUI实现的串口编程例子，IDW距离反比加权方法，考虑雨衰 阴影 和多径影响，匹配追踪和正交匹配追踪，阐述了负荷预测的应用研究,借鉴了主成分分析算法（PCA）。- Dual-line interpolation FFT harmonic analysis kaiser windows, Use serial programming examples matlab GUI implementation, IDW inverse distance weighting method, Consider shadow rain attenuation and multipath effects Matching Pursuit and orthogonal matching pursuit, It describes the application of load forecasting, It draws on principal component analysis algorithm (PCA). Platform: |
Size: 8192 |
Author:spwhe |
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Description: 均值便宜跟踪的示例，包括数据分析、绘图等等,结合PCA的尺度不变特征变换(SIFT)算法，仿真效果非常好，考虑雨衰 阴影 和多径影响，基于欧几里得距离的聚类分析。- Example tracking mean cheap, Data analysis, plotting, etc., Combined with PCA scale invariant feature transform (SIFT) algorithm, Simulation of the effect is very good, Consider shadow rain attenuation and multipath effects Clustering analysis based on Euclidean distance. Platform: |
Size: 7168 |
Author:jhyzzrcn |
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Description: 激光在大气中传输随距离变化的衰减，以及场强的分布-Laser transmission in the atmosphere varies with distance attenuation and field intensity distribution Platform: |
Size: 1024 |
Author:penjiaqi |
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Search - Distance attenuation