Description: 该程序是用matlab语言实现的关于瑞利信道多径传输的多谱勒效应的描述-that the procedure was used Matlab language on the Rayleigh Channel multipath transmission of the description of Doppler effect Platform: |
Size: 3112 |
Author:火箭 |
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Description: 该程序是用matlab语言实现的关于瑞利信道多径传输的多谱勒效应的描述-that the procedure was used Matlab language on the Rayleigh Channel multipath transmission of the description of Doppler effect Platform: |
Size: 3072 |
Author:火箭 |
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Description: 通过仿真,分析了多径效应和多普勒效应的原理.并给出了移动信道的建模方案和程序.每个结论都给出了仿真程序可直接运行.-through simulation, Analysis of the multi-path effects and the principle of Doppler effect. and gives the mobile channel modeling programs and procedures. Conclusion gave each a simulation program can run. Platform: |
Size: 1139712 |
Author:李艳平 |
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Description: 多径多普勒效应讲义(含matlab程序)讲解的非常详细 通俗易懂并包含大量的matlab仿真-Doppler effect of multi-path overhead (including Matlab procedures) on the very detailed user-friendly and contains a number of The Matlab simulation Platform: |
Size: 1139712 |
Author:张培卿 |
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Description: Effect of multipath on COFDM signal.
This simulates the effect of a single multipath signal as the amplitude
of the reflected signal is varied.
The reflected signal has a constant delay of 400 samples, while the
reflected signal power to direct signal power ratio is varied from
-16dB to +16dB.
The simulation models BPSK, QPSK, and 16PSK.
The simulation time was 1361 sec on a pentium 166MHz with 32MB ram,
it requires 14.28 GFlops.
The results of the simulation can be found in multiamp.xls Platform: |
Size: 13312 |
Author:mohammed |
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Description: Effect of multipath on COFDM signal.
This simulates the effect of a single reflection multipath signal which
is 3dB weaker then the direct signal.
The script which runs the simulation is simmulti.m. However it does not
generate the entire plot as several places required smaller increment
size on the multipath delay.
Run fig17.m
The approximate calculation time is 1 hour, with 30 GFlops.
The results of the simulation can be found in multisingle2.xls Platform: |
Size: 15360 |
Author:mohammed |
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Description: 由于实际信道中的多径和阴影效应，单个认知用户频谱感知的性能受到影响，因此需要靠不同用户间的协同频谱感知来对抗多径和阴影效应。本设计要求在文中采用一种协作机制，即两用户进行协作频谱感知，提高主用户的检测率，减少检测时间，并且得到捷变增益。要求给出仿真结果。-As the actual channel of the multi-path and shadow effect, a single user of spectrum sensing of cognitive performance are affected, it needs to depend on collaboration between different users of spectrum sensing to combat multipath and shadow effects. The design requirements in the text using a cooperation mechanism, namely, two user collaborative spectrum sensing, to improve the detection rate of the primary users, reducing detection time, and get agility gain. Required to give simulation results. Platform: |
Size: 719872 |
Author:林熙怡 |
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Description: 验证了多径效应与瑞利衰落，分别测试了10、100、500、1000条路径下的衰落情况。-Verify the effect of multipath Rayleigh fading, were tested under the fading paths 10,100,500,1000 situation. Platform: |
Size: 1024 |
Author:andy |
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Description: 针对多径效应的影响，提出了一种基于矩阵束的MIMO 雷达低仰角快速估计方法。该方法同时考虑了发射多径信号和接收多径信号，采用单样本数信号矢量构造了一个前后向矩阵束，并利用两个酉矩阵对该矩阵束进行降维处理，最后采用广义特征值分解的总体最小二乘法来估计目标角度。算法不需要估计数据协方差矩阵，可在低
信噪比和单样本数情况下，有效地克服多径效应，实现同时多目标低仰角估计，相比最大似然算法，避免了谱峰搜索，计算量小。仿真结果验证了该算法的有效性。-To overcome the multipath effect, a fast algorithm for low elevation estimation for MIMO radar via matrix pencil is proposed. The signals both in transmit multipath and receive multipath are considered. Firstly, a forward-backward matrix pencil is formed based on the single-sampled vector. Secondly, the reduced-dimensional processing is applied to the matrix pencil via two unitary matrices. Finally, the generalized eigen-decomposition is employed to estimate the low elevation in multipath environments directly. Without the covariance matrix estimation, the proposed method can overcome multipath effect effectively in case of low SNR and estimate multi-target simultaneously. Compared with Maximum Likelihood (ML) method, it avoids spectrum peak searching and reduces the computational burden. Numerical results verify the effectiveness of this method Platform: |
Size: 254976 |
Author: |
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Description: 由于多径和移动台运动等影响因素，使得移动信道对传输信号在时间、频率和角度上造成了色散，如时间色散、频率色散、角度色散等等，因此多径信道的特性对通信质量有着至关重要的影响，而多径信道的包络统计特性成为我们研究的焦点。根据不同无线环境，接收信号包络一般服从几种典型分布，如瑞利分布、莱斯分布和Nakagami-m分布。-Because multipath and mobile and other sports influence factor, makes mobile channel in transmission in time and frequency signal and Angle caused the dispersion, such as time dispersion, frequency dispersion, Angle dispersion, and so on, thus multipath channel of communication with the characteristics of quality is very important, while the effect of multipath channel (the statistical properties become the focus of our research. According to different wireless environment, receiving signals envelope general subject to several typical distribution, such as Rayleigh distribution, rice distribution and Nakagami-m distribution.
Platform: |
Size: 1024 |
Author:liufan |
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Description: 为解决信道中的多经效应问题，可采用LMS和RLS算法。当C/A码通过多径信道时，会产生误码。本作通过LMS和RLS算法较好的解决了这个问题。压缩文件里是一个simulink仿真，通过这个仿真不仅可以学习simulink的使用，还能较好的理解LMS和RLS算法的原理-To solve more than by the effect of the channel can be used LMS and RLS algorithm. When the C/A code by multipath channel will result in error. This for the better by LMS and RLS algorithm to solve this problem. Compressed file is a simulink simulation simulink use this simulation can not only learn, but also a better understanding of the principle of LMS and RLS algorithms Platform: |
Size: 12288 |
Author:李 |
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Description: 在研究了超高速OFDM系统传输模型的基础上，对OFDM系统的传输信号结构进行了分析，结合传统的多普勒频移算法，用OFDM信号循环前缀所包含的相对频偏信息设计了实时性较好的多普勒频移估计方法，并分析了多径效应对于循环前缀数据的“污染”效应，对该算法进行了优化，提高了算法的频移估计性能，并对该算法进行了性能验证。-Based on the study ultra-high-speed transmission of OFDM system model, the OFDM signal structure for the transmission system is analyzed, combined with traditional Doppler shift method, the relative deviation OFDM signal with cyclic prefix information contained in the real-time design Doppler shift better estimation methods, and analyzes the " pollution" effect of multipath effects for cyclic prefix data, the algorithm has been optimized to improve the frequency estimation algorithm performance and the performance of the algorithm verification. Platform: |
Size: 22528 |
Author:但的东 |
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Description: 针对移动通信系统中多径干扰的问题，主要从以下两个方面对OFDM系统进行仿真验证：1、添加循环前缀（CP），如何降低码间干扰；2、添加均衡如何进一步提高系统的抗干扰效果。
-Mobile communication system for the problem of multipath interference, mainly from the following two aspects of OFDM system simulation: 1, add cyclic prefix (CP), how to reduce inter-symbol interference 2, how to add balance to further improve the anti-jamming system effect. Platform: |
Size: 6144 |
Author:赵凝 |
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Description: 此文档详细描述了多普勒频移以及多径对信号传输的影响。包含原理分析与推导。同时附有完整的程序以及结果仿真图。讲解全面，帮助很大。-This document describes in detail the doppler frequency shift and the multipath effect on the signal transmission.Contains the principle analysis and derivation.At the same time with complete program as well as the results of the simulation diagram.Interpretation of the overall, a great help. Platform: |
Size: 1651712 |
Author:zxyxiaoyuer |
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Description: 多径和多普勒的讲义，文件内含matlab源代码，对于了解多径和多普勒效应很有帮助。-Multipath and Doppler handouts, matlab file containing the source code for understanding the effect of multipath and Doppler helpful. Platform: |
Size: 1138688 |
Author: |
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Description: 对无线通信环境下的多径衰落和阴影衰落进行的建模。给出了一些仿真的建议(Modeling on multi-path effect and shadowing under wireless communication system. And this code gives some advice on simulation of these situation.) Platform: |
Size: 4195328 |
Author:NeoScofield
|
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Description: Over-the-horizon radar (OTHR) exploits skywave propagation
of high-frequency signals to detect and track targets,
which are different from the conventional radar. It
has received wide attention because of its wide area surveillance,
long detection range, strong anti-stealth ability,
the capability of the long early warning time, and so on.
In OTHR, a significant problem is the effect of multipath
propagation, which causes multiple detections via
different propagation paths for a target with missed detections
and false alarms at the receiver [1–6]. Nevertheless,
the conventional tracking algorithms, such as
probabilistic data association (PDA) [7–9], presume that
a single-measurement per target, it may consider the
other measurements of the same target as clutter, and
multiple tracks are produced when a single target is
present. Therefore, these methods cannot effectively
solve the multipath propagation problem.(Conventional multitarget tracking systems presume that each target can produce at most one measurement
per scan. Due to the multiple ionospheric propagation paths in over-the-horizon radar (OTHR), this assumption is
not valid. To solve this problem, this paper proposes a novel tracking algorithm based on the theory of finite set
statistics (FISST) called the multipath probability hypothesis density (MP-PHD) filter in cluttered environments.
First, the FISST is used to derive the update equation, and then Gaussian mixture (GM) is introduced to derive
the closed-form solution of the MP-PHD filter. Moreover, the extended Kalman filter (EKF) is presented to deal
with the nonlinear problem of the measurement model in OTHR. Eventually, the simulation results are provided
to demonstrate the effectiveness of the proposed filter.) Platform: |
Size: 18432 |
Author:ioeyoyo |
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Search - effect of multipath