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Re: [Discuss-gnuradio] BER measurement for GMSK transmission with USRP w

From: Vanush Vaswani
Subject: Re: [Discuss-gnuradio] BER measurement for GMSK transmission with USRP wirelessly
Date: Fri, 4 Jul 2014 18:53:21 +1000

GMSK Mod takes in packed bytes, Demod outputs unpacked bytes (e.g. 1
bit per byte). You may need to perform a conversion. Best way to
figure out is to post a screenshot of your flowgraph.

On Fri, Jul 4, 2014 at 6:18 PM, Sun Wenbin <address@hidden> wrote:
> Good day everyone,
> My sincere apology in advance if this question has been asked before, but i
> tried search thru the archives but to no avail.
> Currently, I am trying to calculate the BER for GMSK, But first I started
> off on a perfect channel without USRP.
> My current block diagram is as follows:
> "Random Source"
> 0s and 1s, 10^6 windows -> "Throttle" -> "GMSK Mod (default settings)" ->
> "GMSK Demod (default settings)" -> "Error Rate Block"
> I am feeding in "Error Rate block" with the random source and the "GMSK
> Demod" Output.
> I am getting BER of 50%... Anyone knows what is wrong?
> In fact, I saved the input and output as binary files. I found out that they
> are not very identical especially in terms of binary length. I tried input 9
> bits of binary and I obtained 63 bits from the GMSK Demod Output.
> Is there something that is missing?
> Hope someone can advise me. Thank you :)
> Best Regards,
> Sun
> _______________________________________________
> Discuss-gnuradio mailing list
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