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From: | chai E |
Subject: | Re: [Discuss-gnuradio] ber_simulation |
Date: | Wed, 18 Nov 2015 20:21:19 +0800 |
DerekRegards,Hello Ekko,In the first simulation there is no delay or channel effects, other than a small amount of simulated noise, so the data bits line up perfectly at the start of the error rate block. Now that you are transmitting over actual radios you have to account for all of the additional delay. That is your correct bit error rate right now, you are just not measuring what you expect. You will need to, at least, add packetising and some flow control to synchronize the inputs to the error rate block.On Tue, Nov 17, 2015 at 3:04 PM, chai E <address@hidden> wrote:_______________________________________________today i run the /usr/share/gnuradio/examples/digital/demo/ber-simulation.grcjust likethe picture1, i exe the grc file and got the ber is near zero,i think this is normalthen i seprate this grc into wo partthe one is chunks to symbols+uhd_sinkthe other is uhd_source+constellation decoder,disable the noise,the result isit is too large ,this is symbol error rate。next is my set of uhd
center_freq is 433Mi 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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