Re: [Discuss-gnuradio] Problem with USRP PSK modulation

[Samuel Ibarra]

Hello Vivian,

 

I was able to solve the problem. The encoder and decoder blocks seem to only work with certain modulation blocks. You should try changing your modulation type to GMSK. We have being able to transmit text and picture files with this set up.

 

Sam

On Wed, Apr 25, 2012 at 7:14 AM, Vivian Paola Triana Galeano <address@hidden> wrote:

Hi Samuel!

I haven't solved it yet. I tried to set center frequency with a slider to vary a little bit the frequency of the receiver, but it didn't work.
Have you solved the problem?

Thanks!

Vivian Triana

2012/4/19 Samuel Ibarra <address@hidden>

Hello Vivian,

 

I have also had this problem, but I haven't being able to solve it. Could you please let me know if your able to solve it? I would greatly appreciate your help.

 

Sam

On Thu, Apr 19, 2012 at 7:41 AM, Vivian Paola Triana Galeano <address@hidden> wrote:

I'm using non-differential modulation. But I used differential before and it didn't work neither. I think my problem is with the sample rate that I have to set in UHD_USRP Sink and Source Blocks. I try to send a wav file that has maximum frequency of 12kHz so I set the sample rate at 28kHz, however it didn't. I need understand what the sample rate refers to.

Thansks in advance for helping me!

2012/4/19 Tom Rondeau <address@hidden>

On Wed, Apr 18, 2012 at 11:32 AM, Vivian Paola Triana Galeano
<address@hidden> wrote:
> I'm working with USRP1 daughterboard RFX 2400 MHz.
> The configuration of the parameter  in UHD_USRP block is sample rate= 1MHz
> Center freq=2.4GHz.

Vivian,
Are you using differential or non-differential modulation? Over the
air, the phase ambiguity at the receiver does not get worked out, so
it will only work if you use differentially encoded symbols.

Tom

> 2012/4/18 Edmar Candeia Gurjao <address@hidden>
>>
>> Hi Vivian,
>>
>> give us details about your set up, like what USRP you are using,
>> daughterboads and frequency of transmission,
>>
>> Edmar
>>
>> 2012/4/18 Vivian Paola Triana Galeano <address@hidden>:
>> >
>> > I think my problem has something to do with the parameters of the USRP.
>> >
>> > I  try to send a file modulated with BPSK. So I build a graph like this
>> > :
>> >
>> > File source -> Packet Encoder -> PBSK MOD -> PBSK DEMOD -> Packet
>> > Decoder ->
>> > File sink
>> >
>> >
>> >
>> > and i really get the correct output file with thee right constellation.
>> >
>> > If I put a USRP source and USRP sink into graph, I don't receive
>> > anything.
>> > I hope anyone can help me. Thanks
>> >
>> >
>> > _______________________________________________
>> > Discuss-gnuradio mailing list
>> > address@hidden
>> > https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
>> >
>>
>>
>>
>> --
>> ---------------
>> Edmar Candeia Gurjão
>> Universidade Federal de Campina Grande.
>> 1 574 387 0195
>> http://ecandeia.dee.ufcg.edu.br
>
>
>
> _______________________________________________
> Discuss-gnuradio mailing list
> address@hidden
> https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
>

_______________________________________________
Discuss-gnuradio mailing list
address@hidden
https://lists.gnu.org/mailman/listinfo/discuss-gnuradio