Kay,

Freq offset can be added by multiplying the baseband data with
complex-exponential. In GR this can be done by any of the following ways
 1. Sine Source and Multiply block or
 2. Freq Translating FIR Filter
 3. Channel Model

-Adeel


On Thu, Jul 25, 2013 at 8:26 PM, Yingjie Chen <ocg...@gmail.com> wrote:

> Hi guys,
> Thanks in advance.
>
> Since freq. offset is time related, like exp(2pi * fΔ * t), how can I
> generate freq. offset in gnuradio?
> Normally, freq. offset exists due to mismatched oscillators between
> transmitter and receiver.
> Is that possible  get the same freq. offset effect mentioned above, merely
> through modifying some code in GunRadio but not modifying the RF hardware
> in USRP. For example, if I want to add 1KHZ offset in sender in data
> symbol(not preamble part,to avoid freq. offset correction), to see if the
> receiver can still succeed to decode the data, how should I do? Which part
> should I locate at after IFFT moving the samples to base band?
>
> Thanks again.
>
> Best,
> Kay
>
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