Interpolation and the additive white gaussian noise

Prasanna wrote:
> Jerry Avins wrote:
> 
>> Prasanna wrote:
>>> Jerry Avins wrote:
>>>> Prasanna wrote:
>>>>> Dear all,
>>>>>
>>>>> The following problem recently came up in one of my simulations. I have
>>>>> a PSK modulated RRC filtered signal that I have to transmit over the
>>>>> AWGN channel. Before RRC filtering, I interpolate the IQ signal to
>>>>> twice the Nyquist rate.
>>>> Do you mean that there are components of the signal up to and including
>>>> half the sample rate? that can't work.
>>> It will. Because it is four times over sampling already.
>> What does "... two setups: The first one transmits the RRC filtered
>> signal at twice the Nyquist rate ..." mean?
> 
> What is Nyquist rate? Supposing the signal spectrum extends from -B/2
> to +B/2, the Nyquist sampling rate would be B. And twice the Nyquist
> rate would mean 2B.

I didn't read it that way. Your usage may be correct.

Jerry
-- 
Engineering is the art of making what you want from things you can get.
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