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33 Threads found on Doppler Effect
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...
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
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
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).
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 (...)
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.
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 :-)
Hello, I am looking for a MATLAB code for OFDM that introduces doppler effect due to relative motion of Tx/Rx. Thanks in advance
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.)?
Please give more detail how to do range measurement with a doppler algorithm?
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
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
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
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 :|
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 (...)
Does doppler effect change the amplitude?doppler effect no, fading generator yes. Basic doppler effect involves a time-variant phase shift and no amplitude variation. But the said fading generator (I don't know the specific MATLAB implementation) superimposes multiple channels.
hi all! i have a problem about how to calculate a frequency change accross one pulse after tha doppler shift. and phase change accross one pulse are no of pulses. ???? plz plz. i can not guess the piont how to calculate it. if anyone know it plz reply
hi i proposed a measurement a vehicle velocity used ultrasonic by doppler effect(frequency shift) please help me.
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,
dear friends.. did anybody used the function by name : rayleighchan in matlab.. actually when i use this function for simulating my ofdm system by making dopler frequency = 0 working well..but when i make dopler frequncy Fd is varying the code is not giving any performance variations.. could u pls suggest me whether i have
Hi. I have a problem understanding the circuit I have attached. As i understand, the signal that is received (in sinusodial form) is being "converted" to a pulse length depending on the incoming signal's frequency. Am I right on this? Can anyone explain me maybe in more detail about what is really going on. Would appreciate it lot. The circui
Why not using doppler effect ?! The principal advantage is that it lets very precise measurements, but it's hardier to make than others circuits.
Hi, Can somebody help me? For my project, I have to simulate a doppler radar with matlab. Do someone have an idea about the code? And do someone have an idea about how to compute a correlation function with Matlab? THANKS a lot for your help.
Do someone know how to compute the doppler effect with matlab? thanks a lot
Hi everyone I think I've post in the wrong forum yesterday, so here is my problem. I have to make a matlab program in order to draw the IQ diagram for some signals as BPSK and QPSK. I have to correct the doppler effect and the phase shift with PLLs. I think Costas loops are good for correcting the phase shift. But what about the (...)
Hi everyone I'm new here and I need some help from u. I have to make a matlab program in order to draw the IQ diagram for some signals as BPSK and QPSK. I have to correct the doppler effect and the phase shift with PLLs. I think Costas loops are good for correcting the phase shift. But what about the doppler effect ? (...)
i have question if the mobile channel cause a frequency modulation of the subacarriers in an OFDM based syste? And i want to know what is the physical explanation of the doppler shift from the communications point of view?
please explain for me doppler effect
Hi! I know that aircraft navigation is based on DME equipments which provide a measure of distance and VOR equipments which provide a measure of angle. DME measure is done by measuring the time distance between pulses generated by aircraft and echoed by DME. I've heard that the measure of the angle is achieved by doppler effect of RF signal gener
Is spectral frequencies related to doppler effect shift.For example. the doppler shift effect will be positive if the recever (mobile phone) is moving towards to the base station. :?: Thank you,..
Hi there Dear friends I need a sensitive Am reciever circuit (demodulator) circuit for demodulating signals that modulated machanically by doppler effect and recieved by a piezoelectric transducer at 2Mhz and amplitude about 10 mv. Please Help me thanx
If you are talking about a speed gun that measures the speed of a moving object using doppler effect then I am afraid it is not as easy as you think. It requires precise frequency shift measurement of RF signal. Alternate method is to use image processing to determine motion and then analyzing the speed.