Re: [Discuss-gnuradio] gmsk+fec

[Tom Rondeau]

On Tue, Dec 29, 2015 at 11:24 AM, Ekko <address@hidden> wrote:

hello bob

this problem have been solved,now my fec&gmsk is worked

but i got a new problem 

this is my fec+gmsk grc

http://i.imgur.com/ZH2qhh6.png

and this is my gmsk without fec

http://i.imgur.com/zJVskUX.png

when i run these two grc,i got a similar value of ser

i think that in the way of gmsk&fec,i will got a error rate value  smaller than the single gmsk,but i did not got it,

so i think there is somethin wrong in my grc,hope someone who can help me to check my grc ,or give me sone instruction about the using of fec.

thank you

--Ekko

Ekko,

It might be worth using the exact same graph for both tests but use the Dummy Encoder and Dummy Decoder variables for the FEC codes. These are just pass-through "codes" that allow you to easily use the same structure with and without any actual coding.

Also, you should run "ber_curve_gen.grc" that comes as an example with gr-fec. This will give you an idea of what kind of BER correction you should expect for the different codes.

Tom

 

2015-12-29 13:15 GMT+08:00 bob wole <address@hidden>:

Ekko,

Add a Tag debug block after your packet encoder and see if there are any tags coming out of it. I think packet encoder is not passing your tag. If that is the case, move your stream to tagged stream block after the packet encoder just before the FEC extended tagged encoder. Hope it helps.

--

Bob 

this is the address of picture

http://imgur.com/2EQiY6O

sorry to send two e-mails

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