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How to generate 2 tone IQ signal

Started by tmdisanto ●October 28, 2015
Hello,

I'm trying to generate an IQ baseband signal in Matlab that is a simple 2
tone signal but I can't seem to find the necessary equations.  What would
an implementation look like that does this (generically, doesn't have to
be specific to Matlab).

Thanks!


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Reply by ●October 28, 20152015-10-28
On Wednesday, October 28, 2015 at 7:38:05 PM UTC-5, tmdisanto wrote:

> Hello,
> 
> I'm trying to generate an IQ baseband signal in Matlab that is a simple 2
> tone signal but I can't seem to find the necessary equations.  What would
> an implementation look like that does this (generically, doesn't have to
> be specific to Matlab).
> 
> Thanks!
> 
> 
> ---------------------------------------
> Posted through http://www.DSPRelated.com


Use two equiamplitude quadrature oscillators and add the two I signals together and add the two Q signals together.

Clay
Reply by kaz ●October 29, 20152015-10-29
>Hello,
>
>I'm trying to generate an IQ baseband signal in Matlab that is a simple

2

>tone signal but I can't seem to find the necessary equations.  What

would

>an implementation look like that does this (generically, doesn't have to
>be specific to Matlab).
>
>Thanks!
>
>
>---------------------------------------
>Posted through http://www.DSPRelated.com


y = exp(j*2*pi*(1:10000)*.01) + exp(j*2*pi*(1:10000)*.02);

Kaz
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Reply by Tauno Voipio ●October 29, 20152015-10-29
On 29.10.15 18:16, kaz wrote:

>> Hello,
>>
>> I'm trying to generate an IQ baseband signal in Matlab that is a simple
> 2
>> tone signal but I can't seem to find the necessary equations.  What
> would
>> an implementation look like that does this (generically, doesn't have to
>> be specific to Matlab).
>>
>> Thanks!
>>
>>
>> ---------------------------------------
>> Posted through http://www.DSPRelated.com
>
> y = exp(j*2*pi*(1:10000)*.01) + exp(j*2*pi*(1:10000)*.02);
>
> Kaz



For a good two-tone test signal, you should choose tones
that are not harmonically related.

-- 

-TV
Reply by kaz ●October 29, 20152015-10-29
>
>For a good two-tone test signal, you should choose tones
>that are not harmonically related.
>
>-- 
>
>-TV


y = exp(j*2*pi*(1:10000)*.01) + exp(j*2*pi*(1:10000)*.0119377);


At least he got the idea so play with the equation as you like.

Kaz
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