Re: [Discuss-gnuradio] ber_simulation

[chai E]

hi trip 

i am using e310,and i have measuring the gain of usrp tx interface

so i connect the tx and rx with a line , i am sure this will not damage the dev

i am not sure if i set the gain of uhd source,will it damage the dev

this is the set of uhd source

​

this is the result

​

2015-11-17 23:10 GMT+08:00 James Humphries <address@hidden>:

Hi Ekko,

You need to set some gain with the USRP Source. What USRP are you using for these tests? Is this a wireless test?

-Trip

On Tue, Nov 17, 2015 at 10:04 AM, chai E <address@hidden> wrote:

today i run the /usr/share/gnuradio/examples/digital/demo/ber-simulation.grc

just like 

the picture1, i exe the grc file and got the ber is near zero,i think this is normal

then i seprate this grc into wo part 

the one is chunks to symbols+uhd_sink

the other is uhd_source+constellation decoder,

disable the noise,

the result is 

it is too large ,this is symbol error rate。

next is my set of uhd

​

center_freq is 433M

i want to know is there something wrong in my the uhd setting,

and why the symbol error rate is so large.

​

hope i have Elaborated my problem  clearly

--Ekko
 ​

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