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How to simulate frequency offset in Matlab between transmitter and receiver?

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zeerum

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hi guyz
i have to simulate frequency offset in matlab between transmitter and reciever at -1kHz and 1 kHz

just dont know how to do it
can anyone help
 

help matlab

If your carier frequency is:
f=sin(2.4e9*2*pi*t);
then why dont you just subtract the offset?
f=sin((2.4e9-1e3)*2*pi*t);
 

Re: help matlab

u sure about this?
i read somewhere that we have to multiply it by an exponential function to get an offset
so m kinda confused
what about phase offset...would frequency offset automatically give phase offset or we would have to plugin values for phase offset like we did for frequency?

also if i have to recover my original signal from any arbitrary frequency offset, what would u suggest for it then?
 

Re: help matlab

no replies :cry::cry:
 

Re: help matlab

Frequency is the derivative of phase (or phase is the integral of frequency). So, if you have a fixed offset frequency, that will result in a varying (linear) phase offset.

Hope that helps...
 

    zeerum

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Re: help matlab

ok fine

but what about carrier recovery?
 

Re: help matlab

would be great if someone help me too with pll code in matlab for DQPSK
 

Re: help matlab

Well, here is the answer of the offset frequency.
If there could be an offset between a transmitter and a receiver, then the design should be tolerable to it. This can be done by using a PLL or a DLL whose bandwidth is greater than that offset frequency.
Recovery is not a simple thing. There are alot of things that need to be know to determine what you need.

Hope that helps...
 

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