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Description: In this thesis report, four novel algorithms for estimating Doppler spread andfrequency offset are introduced and verified in multi-path channel environment in uplink LTE.
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Size: 1082368 |
Author: Allen |
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Description: Create a channel object that describes the channel that you want to use. A channel object is a type of MATLAB variable that contains information about the channel, such as the maximum Doppler shift.
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Size: 2048 |
Author: edward |
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Description: 从回波中估计多普勒参数是合成孔径雷达运动补偿的关键。文中研究了多目标回波对参数估计的影响，从理论上推导了估计多普勒中心和调频率对回波的不同要求，并用两个指标举例分析了一段实测机载SAR数据，给出了实际应用中参数估计时选择回波的原则。-Doppler parameters estimation from radar echoes is a key step in SAR(Synthetic Aperture Radar}motion cornpensation．
This paper researched the efect of multiple targets echoes to estimate parameters and deducted theoretically the different
requirement for echoes in estimating doppler centroid and doppler frequency modulation rate．Th en giving a real airborne SAR echo
as example，we analyzed it with two measurements and concluded the principle about choosing echoes in practice．
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Size: 187392 |
Author: nico |
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Description: I m actually having trouble with the equalization of the channel, because the doppler effect introduces phase rotation, which I don t know how to correct. If anyone could help me, I d be really thankful.-I m actually having trouble with the equalization of the channel, because the doppler effect introduces phase rotation, which I don t know how to correct. If anyone could help me, I d be really thankful.
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Size: 8192 |
Author: Rafal |
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Description: 使用维纳分布进行瞬时频率估计用来校正电离层非线性相位污染带来的频带展宽-High-frequency (HF) sky-wave radar
signals propagate to and from the target by means
of the ionosphere. The difficulty in obtaining very
narrow beamwidths at HF, and the long ranges
involved, mean that the signal backscattered from
the ground is often several orders of magnitude
greater than the target echo. To resolve the target,
coherent signal processing techniques are necessary,
detecting the target echo by virtue of the
Doppler shift caused by the target’s radial velocity.
Unfortunately, movement of the ionospheric
layer by which the radar signal has propagated
often causes the clutter spectrum and target to
spread in the frequency domain, rendering
extended coherent integration pointless. The
movement of the ionosphere can be regarded as
producing frequency modulation of the radar
signal, and thus if this modulation can be estimated
the radar signal may be corrected for the ionospheric
contamination. A technique using the
complex argument of the first-order mo
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Size: 615424 |
Author: sunrong |
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Description: 一个存在多普勒扩散的qam信号产生程序，主要用于相关仿真工作-a program for qam with doppler
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Size: 1024 |
Author: 高勇 |
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Description: 使用Jakes所假设的模型，用来产生信道抽头延迟线模型中的抽头增益过程所需的多普勒频谱成形滤波器有多种实现方法。时域FIR滤波器是最常用的一种实现方法。-Assumed the use of Jakes model, used to generate the channel-tap-tap delay line model of the process gain the necessary Doppler spectrum shaping filter has a variety of implementations. Time domain FIR filter is an implementation of the most commonly used method.
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Size: 2048 |
Author: wengfh |
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Description: This is a compact satellite tracking program. Using it even an older PC (from 486 up, DOS, VGA) can serve to track a satellite and turn the antenna, which allows newer PCs to be used for other purposes. For example other software can be used in parallel to get more information on multiple satellites or contact ranges.
It has the following functions needed in satellite communications:
Tells in which direction the satellite is.
Prints the azimuth and elevation angle numbers to the parallel port for automatic tracking (8 bit parallel data).
Gives pulses to two LPT pins for automatic doppler correction (up / down). -This is a compact satellite tracking program. Using it even an older PC (from 486 up, DOS, VGA) can serve to track a satellite and turn the antenna, which allows newer PCs to be used for other purposes. For example other software can be used in parallel to get more information on multiple satellites or contact ranges.
It has the following functions needed in satellite communications:
Tells in which direction the satellite is.
Prints the azimuth and elevation angle numbers to the parallel port for automatic tracking (8 bit parallel data).
Gives pulses to two LPT pins for automatic doppler correction (up/down).
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Size: 65536 |
Author: Martin Silisque |
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Description: signal processing for radar such az range, doppler, gain and all fundamental feature.
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Size: 15360 |
Author: ehsi |
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Description: A signal is transmitted using a carrier frequency of 900 MHz. It is
transmitted through a multipath channel which can be modelled as Rayleigh
fading. Assumingthe Dopper spread as 10Hz and the number of multipaths as
10, generate the Rayleigh faded signal. Compute the outage rate (the
probability of the signal falls below certain rate, say ?10 dB) of the
signal.
Using MATLAB, demonstrate the path loss as a function of loss parameter
for distances ranging from 2 km to 40 km. Calculate the power loss in dB
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Size: 1024 |
Author: Johnathan |
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Description: matlab工具包，非常有用的信号时频分析工具,stft,doppler-matlab toolkit, a very useful time-frequency analysis tools, stft, doppler
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Size: 2067456 |
Author: mqy |
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Description: 2. 关于无线信道的多普勒谱，请回答以下问题：
(1) 在某些无线信道中，多普勒频移会引起无线信道输出信号的混叠。请描述产生混叠的各种原因；
(2) 无线信道中的多普勒谱有一种经典谱(classic spectrum)，请解释产生这种谱形状的机理；
(3) 请用Simulink工具编写代码(S-Function方式)，产生一单径瑞利信道，其多普勒谱为经典谱，其中移动速率为120km/h。并请回答：证明自己用计算机产生的经典谱是正确的可能方法。
-On the wireless channel of the Doppler spectrum, please answer the following questions: (1) In some radio channels, the Doppler frequency shift will cause the output signal of the wireless channel aliasing. Please describe the aliasing produced a variety of reasons (2) wireless channel in the Doppler spectrum has a classical spectrum (classic spectrum), please explain the mechanism of produce such spectral shape (3), please use the Simulink tool to write code ( S-Function mode), resulting in a single-path Rayleigh channel, the Doppler spectrum for the classical spectrum, including mobile rate of 120km/h. And requested the answer: that they used computer-generated classical spectrum is the right possible way.
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Size: 31744 |
Author: Helen |
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Description: multipath channel model of the mobile radio channel with doppler effect
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Size: 1024 |
Author: erkkrz |
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Description: 国外大学的讲义，对学习这2种效应基础理解很有帮助，pdf文档中有matalb代码带你一步一步的学习，很值得推荐。-Multipath and Doppler Effects and Models,very useful document of understanding the basic principle with its matlab code .
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Size: 1130496 |
Author: shilei |
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Description: 用于仿真多普勒频移与每条反射波以及到达角之间的关系,可以自行修改参数得到更多仿真结果,MATLAB2009A上运行通过-For the simulation of Doppler frequency shift and arrival angle of each reflected wave, as well as the relationship between, you can modify the parameters of its own to get more simulation results, MATLAB2009A run through the
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Size: 1024 |
Author: alex |
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Description: 高速移动环境下，多普勒频移很大，子载波正交性遭到破坏，本资料就是为了解决高速环境下，系统的性能。-High-speed mobile environment, doppler frequency is big, the subcarrier orthogonality destroyed, this material is to solve high-speed environment, the performance of the system.
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Size: 4892672 |
Author: yangbk |
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Description: Azimuth dependence of Doppler spectra of sea clutter at low grazing angle
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Size: 199680 |
Author: Dawood Khan |
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Description: 完整的在斜侧视条件下带有二次距离压缩和距离徙动校正的多普勒算法-Complete under the conditions in the oblique side view with a secondary range compression and Doppler range correction algorithm for resettlement action
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Size: 2048 |
Author: 张燕 |
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Description: Doppler Frequency Shift (single path)
multipath signals emit from the source at different angles and
arrive at the observer at different angles. Thus, Doppler shifts of different arrivals are
usually different from one another.-multipath signals emit from the source at different angles and
arrive at the observer at different angles. Thus, Doppler shifts of different arrivals are
usually different from one another.
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Size: 9216 |
Author: linxu |
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Description: OFDM水声通信中最大多普勒频偏估计算法研究-OFDM underwater acoustic communication in the largest Doppler shift estimation algorithm
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Size: 692224 |
Author: 王凯 |
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