Description: 信道模型包括宽带传播模型（链路级仿真需要）和窄带传播模型（系统级仿真需要，包括路径损耗模型和阴影衰落模型）。-Channel model including the broadband propagation model (link-level simulation required) and narrow-band propagation model (system-level simulation needs, including the path loss model and the shadow fading model). Platform: |
Size: 54272 |
Author: |
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Description: 教学实验源代码，提供对滑动窗口协议的实验演示，协议分层和协议软件的设计与实现有基本的认识利用所学数据链路层原理，自己设计一个滑动窗口协议并在仿真环境下编程实现有噪音信道环境下的
可靠的双工通信。信道模型为 8000bps 全双工卫星信道，信道传播时延 270 毫秒，信道误码率为 10-5，信道提供字节流传输服务，网络层分组长度在240~256字节范围-Teaching experiment source code, on the Sliding Window Protocol provides experimental demonstration of the agreement stratification and protocol software design and implementation of a basic understanding of the use of the data link layer principle, its own design of a sliding window protocol and simulation programming environment the realization of the noise channel environment duplex reliable communication. Channel model for 8000bps full-duplex satellite channel, channel propagation delay of 270 ms, channel bit error rate of 10-5, byte-stream channel to provide transmission services, network layer packet length in the range of 240 ~ 256 bytes Platform: |
Size: 414720 |
Author:Tony Yau |
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Description: 瑞利衰落信道（Rayleigh fading channel）是一种无线电信号传播环境的统计模型。这种模型假设信号通过无线信道之后，其信号幅度是随机的，即“衰落”，并且其包络服从瑞利分布。-Rayleigh fading channel (Rayleigh fading channel) is a radio signal propagation environment, the statistical model. The model assumed that after the signal through the wireless channel, the signal amplitude is random, that is, " fading" and subject to its Rayleigh distribution envelope. Platform: |
Size: 43008 |
Author:宋立泉 |
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Description: 利用数据链路层原理，设计一个滑动窗口协议并在仿真环境下编程实现有噪音信道环境下的可靠的双工通信。信道模型为8000bps 全双工卫星信道，信道传播时延270 毫秒，信道误码率为10-5，信道提供字节流传输服务，网络层分组长度在240~256字节范围。-Data link layer using the principle of a sliding window protocol design and simulation environment in the programming channel noise environment duplex reliable communication. 8000bps channel full-duplex satellite channel model, channel propagation delay of 270 ms, channel bit error rate of 10-5, byte-stream channel to provide transmission services, network layer packet length in the range of 240 ~ 256 bytes. Platform: |
Size: 14336 |
Author:红军 |
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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. Platform: |
Size: 328704 |
Author:geful |
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Description: In this paper, a two-dimensional (2-D) transverse
magnetic (TM) mode finite difference time domain (FDTD)
method is used to simulate the indoor radio wave propagation
and model the indoor ultra wideband (UWB) channel. The
modulated Gaussian pulse, which is satisfied the UWB signal
definition and Federal Communications Commission (FCC) indoor
limit spectral mask, is used as the UWB excitation signal. Platform: |
Size: 3072 |
Author:baba |
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Description: 数据链路层的选择性重传协议的编写。在仿真环境下编程实现有噪音信道环境下
两站点之间无差错双工通信。信道模型为8000bps 全双工卫星信道，信道传播时延270毫秒，信道误码率
为10-5，信道提供字节流传输服务，网络层分组长度固定为256字节-The data link layer selective retransmission protocol preparation. In the simulation environment, programming environment, the noise channels between the two sites error-free duplex communication. Channel model for 8000bps full duplex satellite channel, the channel propagation delay 270 milliseconds, the channel bit error rate of 10-5, the channel to provide byte-stream transport service, the network-layer packet length is fixed to 256 bytes Platform: |
Size: 207872 |
Author:chenchen |
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Description: 移动传播环境:理论基础分析方法和建模技术
杨大成编著 内容包括：理论分析移动传播环境所常用的概率论、随机过程及矩阵等基础知识；地球表面均匀大气中的电波传播、室外传播模型，室内无线传播及覆盖，小尺度衰落信道，标量信道建模及其仿真，矢量信道建模及其仿真等。
-Mobile communication environment: theory analysis and modeling Yang Dacheng edited include: theoretical analysis are commonly used in mobile communication environment, probability theory, stochastic processes, and basic knowledge of matrix Earth' s surface wave propagation even in the atmosphere, outdoor propagation model, indoor wireless transmission and coverage, small-scale fading channel, the scalar channel modeling and simulation, vector channel modeling and simulation. Platform: |
Size: 3700736 |
Author:鼻涕虫 |
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Description: 在3.49-3.51GHZ频段内的典型中国城市环境下，地面信号衰落仍服从经典的指数对数分布。在中度误差（σx =10.291）下，路损指数在3.1-3.7之间。半径2公里的小区内，RMS时延在3-4微秒之间；典型的办公室环境中，存在直达径时RMS时延小于0.1微秒。在城市环境中，多径现象很明显，主要由高层建筑物引起，并以簇的方式存在。在城市中低速移动条件下（接收机移动速度小于100 Km/h）某一强径的生存时间通常超过10分钟，但相对到达时间会发生滑动。单一小区内的传播环境具有一定相关性，如果存在直达径，相关性会上升到0.4-0.5。此外，室外室内的测量结果都可以证明Jake模型关于入射角分布假设的合理性。当天线间距在1个载波波长增大到10个载波波长时，天线相关性在0.05-0.4之间。
SIMO信道探测系统能够揭示B3G信道的很多特征，但不能够全面、充分的分析和评估B3G信道。在后续工作中，我们将进一步改进这个测试系统，对B3G系统作更深入的研究。
参考-Aided by a 1-Tx and 2-Rx system working in 3.5GHz frequency and 20MHz bandwidth, JSI-MTLab studied the classic B3G urban wireless propagation environment of China and the classic indoor channel propagation environment through a recent indoor and outdoor wireless propagation measurement. A new path loss exponent is proposed in such band while the general outdoor model of path loss is verified. Also, the statistic results of RMS excess delay, max excess delay and mean excess delay in both indoor and outdoor scenarios are given. The lag-time domain and time-frequency domain channel responses are analyzed. At the end, the results of correlation of different propagation environment in the singular cell and antenna correlation are given as well as the phenomenon being analyzed and explained. Platform: |
Size: 159744 |
Author:xuchen |
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Description: 用jake模型分析通信中多径传播的影响，内容包括所有源程序和文档报告-Communication with jake model the impact of multipath propagation, including all source code and documentation reports Platform: |
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Author:zhangbo |
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Description: 数据链路层滑动窗口协议的设计与实现：利用所学数据链路层原理，自己设计一个滑动窗口协议，在仿真环境下编程实现有噪音信道环境下
两站点之间无差错双工通信。信道模型为8000bps 全双工卫星信道，信道传播时延270毫秒，信道误码率
为10-5，信道提供字节流传输服务，网络层分组长度固定为256字节-Data link layer sliding window protocol design and implementation: use their data link layer theory, their own design of a sliding window protocol, in the simulation environment, programming of the noise channel without the two error-free duplex communication between sites. Channel model is 8000bps full duplex satellite channel, channel propagation delay of 270 milliseconds, the channel bit error rate of 10-5, the channel provides a byte-stream transfer service, the network layer packet length is 256 bytes fixed Platform: |
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Author:lzydwd |
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Description: 一个关于蜂窝小区和微小区的信道模型的MATLAB例子，很好用。-MATLAB example of a cell and microcell channel model, well used. Platform: |
Size: 18432 |
Author:winter |
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Description: 利用所学数据链路层原理，自己设计一个滑动窗口协议，在仿真环境下编程实现有噪音信道环境下两站点之间无差错双工通信。信道模型为8000bps全双工卫星信道，信道传播时延270毫秒，信道误码率为10-5，信道提供字节流传输服务，网络层分组长度固定为256字节。
通过该实验，进一步巩固和深刻理解数据链路层误码检测的CRC校验技术，以及滑动窗口的工作机理。滑动窗口机制的两个主要目标：(1) 实现有噪音信道环境下的无差错传输 (2)充分利用传输信道的带宽。在程序能够稳定运行并成功实现第一个目标之后，运行程序并检查在信道没有误码和存在误码两种情况下的信道利用率。为实现第二个目标，提高滑动窗口协议信道利用率，需要根据信道实际情况合理地为协议配置工作参数，包括滑动窗口的大小和重传定时器时限以及ACK搭载定时器的时限。这些参数的设计，需要充分理解滑动窗口协议的工作原理并利用所学的理论知识，经过认真的推算，计算出最优取值，并通过程序的运行进行验证。-To use the data link layer principle of their own design of a sliding window protocol programming error-free duplex communication between two sites of the noise channel environment in the simulation environment. 8000bps full-duplex channel model satellite channel, the channel propagation delay of 270 milliseconds, the channel bit error rate of 10-5, the channel byte streaming services, network layer packet length is fixed at 256 bytes.
Further consolidated through the experiment, and a deep understanding of the CRC checksum of the data link layer error detection technology, as well as the working mechanism of the sliding window. Sliding window mechanism two main objectives: (1) to achieve error-free transmission of the noise channel environment (2) make full use of the bandwidth of the transmission channel. Running the program in the program can be stably and successfully achieve the first objective, and checks the utilization of a channel in the case of no code error and the error e Platform: |
Size: 640000 |
Author:蜗牛 |
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Description: 该文章提出了一种自动虚拟的校正方法以及对应的定位算法，用于基于RSSI的无线定位领域中，可以提高定位精度。-In this paper,
we present an automatic virtual calibration method of the propagation model that does not require human intervention
therefore, can be periodically performed, following the wireless channel conditions. We also propose a novel RSSI-based
localization algorithm that selects the RSSI values according to their strength, and uses a calibrated propagation model to
transform these values into distances, in order to estimate the position of the mobile Platform: |
Size: 423936 |
Author:曹璐云 |
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Description: This paper presents a proposed model in an
explicit form and its simulation results for
characterizing wideband line-of-sight (LOS)
radio channel in an urban microcellular
environment. The model is fast to compute, easy
to implement, and only those rays that reach the
receiver locations are calculated. Effect of
street-grid, with any number of crossing streets
of different widths, on the propagation
characteristics can be studied. The model
provides details of possible radio paths that join
the basestation with the mobile terminal at any
point in the main street. The characterization of
the channel is presented in three domains. They
are: frequency, temporal and angular domains.
The model can be used to study several
microcellular communication problems. Platform: |
Size: 404480 |
Author:徐清沐 |
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Description: 瑞利衰落信道（Rayleigh fading channel）是一种无线电信号传播环境的统计模型。这种模型假设信号通过无线信道之后，其信号幅度是随机的，表现为“衰落”特性，并且多径衰落的信号包络服从瑞利分布。由此，这种多径衰落也称为瑞利衰落。 这一信道模型能够描述由电离层和对流层反射的短波信道，以及建筑物密集的城市环境。瑞利衰落只适用于从发射机到接收机不存在直射信号的情况，否则应使用莱斯衰落信道作为信道模型。-Rayleigh fading channel, Rayleigh fading channel) is a statistical model of radio signal propagation environment. This model assumes that the signal through a wireless channel, its signal amplitude is random, show the "decline" features, and multipath fading signal envelope obeys Rayleigh distribution. As a result, the multipath fading is also called Rayleigh fading. The channel model can be described by the ionosphere and troposphere reflect shortwave channel, as well as a built-up urban environment. Rayleigh fading is only applicable to direct signal from the transmitter to the receiver does not exist, or rice fading channels as channel models should be used.
Platform: |
Size: 16384 |
Author:李晓林 |
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Description: 瑞利衰落信道（Rayleigh fading channel）是一种无线电信号传播环境的统计模型。这种模型假设信号通过无线信道之后，其信号幅度是随机的，即“衰落”，并且其包络服从瑞利分布。-Rayleigh fading channel, Rayleigh fading channel) is a statistical model of radio signal propagation environment. This model assumes that the signal through a wireless channel, its signal amplitude is random, or "decline", and its envelope obey Rayleigh distribution.
Platform: |
Size: 12288 |
Author:李晓林 |
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Description: 室内信道传播模型，介绍了各种室内信道模型，可以利用来进行信道仿真。-Indoor channel propagation model, introduced a variety of indoor channel model can be used to channel simulation. Platform: |
Size: 1377280 |
Author:王子任 |
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Description: 计算机网络数据链路选择性重传实验。
设计一个滑动窗口协议，在仿真环境下编程实现有噪音信道环境下两站点之间无差错双工通信。信道模型为8000bps 全双工卫星信道，信道传播时延270毫秒，信道误码率为，信道提供字节流传输服务，网络层分组长度固定为256字节。-Computer network data link selective retransmission experiment. Design of a sliding window protocol in simulation programming environment there is no error duplex communication channel between the noisy environment the two sites. Channel model is 8000bps full-duplex satellite channel, the channel propagation delay 270 ms, channel bit error rate, channel provides a byte stream transmission services, network layer packet length is fixed at 256 bytes. Platform: |
Size: 22528 |
Author:vicky |
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Search - channel propagation model