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Doppler Effect

33 Threads found on edaboard.com: Doppler Effect

How to simulate the Doppler shift in cellular (relaying network) system?

Is there a Matlab code (simulation) to insert the effect of the doppler shift in frequency, due to the mobility of the user in a relaying communication system? if anyone knows how to do it, can you please provide me with the code?? I'm trying to evaluate the system performance in the relaying network, i did it without the effect of the (...)

I am doing a project on speed tracking... can anyone help me with how to simulate doppler shift in simulink using a sine wave as an input and how to get the doppler frequency from the doppler shift... thanks...

Making a distance and speed Doppler effect based sensor module

The output of usual doppler modules is "zero-IF" as the received signal is mixed with the carrier itself. You have either single or dual (quadrature) outputs. The object speed is directly proportional to the output frequency. With a quadrature output, you can also detect the direction of movement. There's no distance information, the doppler sig

relation between Doppler effect and Aliasing effect

The two effects have in common that they can alter the apparent frequency of a signal, but their origins are completely different. As Frank said, doppler comes from relative movement, and aliasing comes from sampling. Regards Z

Aliasing & doppler's effect

Not really. Why do you ask? I suppose both are commonly looked at in the frequency domain... and both can lead to signals existing at frequencies where you might not expect them to (if the doppler/aliasing effect was absent).

is doppler effect important?

hi in wireless communication when T > T_D doppler effect leads fast fading, where T is symbol duration and coherence time is T_c = 1/f_D. f_D has the maximum value of 300 Hz, so T_c has the minimum of 3 ms. so doppler phenomena only affects systems with symbol rate below 300 sym/sec. thus in real wireless communication (...)

explanation of doppler shift if the angle is 90

The doppler shift = 0 means that that you receive the same exact frequency that target radiated (or reflected), without any shift. It moves perpendicular to you, it dont get closer or farther.

Why frequency meter gives different readings for different horn angles? +-100MHz

If the LO is not changing frequency when you move around the antenna, this can happen only if there is a doppler effect...but I assume you are not sitting in a F-22 Raptor when measure the frequency of the signal coming from the horn antenna :-)

How to introduce Doppler Shift on OFDM systems?

Hello, I am looking for a MATLAB code for OFDM that introduces doppler effect due to relative motion of Tx/Rx. Thanks in advance

Doppler shift in Matlab?

Hi, I need to apply the doppler effect to a music file, I invoke the music file by using the waveread command, How do I proceed next (frequency spectrum, apparent frequency etc.)?

how to find ultrasonic range(15 feet) finder unsing at89c2051 microcontroller.

Please give more detail how to do range measurement with a doppler algorithm?

Problem with Doppler effect.

doppler effect doesn't vary with the change in the propagating medium, if both the transmitter and receiver are in the same medium and the EM waves donot undergo a change in medium when traveling from transmitter to receiver. doppler effect defines the changes in the received frequency when either receiver or transmitte

Effect of sampling frequency change in OFDM

hi , frequency offsets are due to channel delay spread (coz of channel impairments ) and doppler spread ( movin vehicles) suppose ur upconvertin RF frquency is @ 2 Ghz and IF :100 MHZ , ur transmitting frequency will be 2100 MHZ so if ur channel delay spread is say 10 HZ ur recieved signal at RX will be 2100. 000 010 hz , ur receiver d

measure liquid flow by a contactless clamp flow meter

I think ultrasound too. It uses doppler effect. It is a good method for touchless flow measurement systems. As far as I know acoustic and laser are two ways of it. The former is comparitvely cheaper approach. ut you need to design a system with several receivers. The latter can be very fine solution, but expensive and depends also the tube conditon

OFDM matlab simulation with Doppler shift effect

Hi all I want a sample source code in matlab for simple OFDM modulation that shows the doppler shift effect I have some source codes for OFDM but none of them has the doppler effect I'm wondering if anybody can help thanks :|

Urgent:Rayleigh Fading Channel effects to Tc Signal

Hi Everbody, I need your help in Matlab Rayleigh Fading Channel effects to Tx Signal. When I used Matlab Function filter(channel,tx) there is no problem but when I used Rayleigh doppler Model (Dent) model, I can not use the filter function the below errror(inpur arguments error) Is there another function for this channel effect to the Tx (...)

Doppler Effect in MATLAB

I want to simulate multi-path fading channels in Matlab with doppler. But to my surprise, I found that doppler introduces an AM modulation in the signal. I used the rayleighchan and ricianchan for mimicing the multi-path effects but both give the same AM modulation of the signal with the sinusoid of the frequency fd which is parameter in (...)

How to calculate frequency change accross one pulse!

Hi, I am not sure, it is answer to your question, but doppler effect is here: but pulse: what pulse do you need? rectangular? or one freguency ? rectangular puls is not one frequency. May be try

vehicle velocity measurement used ultrasonic

hi i proposed a measurement a vehicle velocity used ultrasonic by doppler effect(frequency shift) please help me.

Proportional fair scheduling: A question

This question has been taken from , and we need to plot the graph in MATLAB. Does anyone know how to go about this. In this problem we consider the effect of doppler shift in multiuser systems. Plot the sum capacity in a Rayleigh fading environment for different doppler frequencies fD = [0.1Hz, 1Hz,