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

[Tom Rondeau]

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
>
>
>
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