Aside from that, sorry, Marcus L is right: phase is the "angle of the
complex sample you're receiving *relatively to how it was sent*".
On 03/23/2017 06:02 PM, Marcus Müller wrote:
>
> 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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>> Discuss-gnuradio@gnu.org
>> https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
>
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