Hi Fernando,
What if I told you I can predict the relative phase to be uniformly
distributed across (0,2π( , if you don't synchronize?
Anyway, phase is just the angle of the complex sample you're receiving,
so: use the complex_to_arg block!
Best regards,
Marcus
On 03/23/2017 05:53 PM, Trejo Treviño, Fernando Alberto wrote:
>
> I am aware that a random phase shift will be introduced by the
> channel, but I need a method to measure the received phase (even if it
> does not exactly match the one from the transmitter) and store it, so
> I can then run some statistics on them 😊 This is why I think that
> the TX and RX do not need to be phase-synchronized.
>
>
> Best,
>
>
> *Fernando Trejo*
> ------------------------------------------------------------------------
> *From:* Discuss-gnuradio
> <discuss-gnuradio-bounces+f.trejotrevino=jacobs-university...@gnu.org>
> on behalf of Marcus Müller <marcus.muel...@ettus.com>
> *Sent:* Wednesday, March 22, 2017 7:02:35 PM
> *To:* discuss-gnuradio@gnu.org
> *Subject:* Re: [Discuss-gnuradio] Measure and record the phase at the
> receiver
>
>
> Hi Fernando!
>
>
> On 03/22/2017 06:51 PM, Trejo Treviño, Fernando Alberto wrote:
>>
>> Hi Marcus!
>>
>>
>> I am implementing a transmitter and a receiver model using two USRP
>> N210s. Both are using GFSK modulation, and the data is transmitted at
>> 2.4 GHz.
>>
> Cool :)
>>
>> I would like to add a phase shift at the transmitter side via the use
>> of a multiplier block with an exponential.
>>
> Ah, so a multiply_const with a constant of
> $e^{j\frac{2\pi}{f_\text{sample}\varphi}$, yeah.
>>
>> Then, at the receiver I would like to receive this transmitted signal
>> and check if the phase matches the one that was transmitted. This is
>> why I need a measuring method.
>>
>>
> Well, you can't see absolute phase without further ado – that would
> need your TX and RX to be phase-synchronized (you don't know the
> electrical length between your transmitter and receiver, it's
> absolutely random by itself).
>
> Best regards,
> Marcus
>
>
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