ber_before_tx.png
ber_tx.png I am trying to find the Bit error rate for a vector signal.I get a error rate of 0.528(i am assuming it to be 52%) when i don't transmit and an error rate of 0.625000 when i transmit. Am i right on this??i dont understand the logic behind it.. Also,is 52% not too high??!!! thank you
Manjusha

On Fri, Mar 8, 2013 at 8:47 PM, manjusha <[hidden email]> wrote:
ber_before_tx.png It doesn't look like you're doing any carrier recovery? Before putting USRP blocks in there, maybe you should try a straight simulation that adds noise and some frequency offset artificially. Get that working, and then connect up the USRP source/sink?
I am trying to find the Bit error rate for a vector signal.I get a error Around 50% BER is what you would expect from a random signal. 100% BER is very good since you just need to flip all the bits and you get the right answer! That is also given the input signal statistics are sufficiently whitened/random.
You might want to take a step away from putting blocks in GRC and just take a look at some of the resources on the GNU Radio wiki about suggested reading: Sanity is hard to come by if you're dealing with magic. Good Luck! Brian _______________________________________________ Discussgnuradio mailing list [hidden email] https://lists.gnu.org/mailman/listinfo/discussgnuradio 
>> I am trying to find the Bit error rate for a vector signal.I get a error
Just tagging on here... The way you have it set up is compare the
>> rate of 0.528(i am assuming it to be 52%) when i don't transmit and an >> error rate of 0.625000 when i transmit. >> >> Am i right on this??i dont understand the logic behind it.. >> >> Also,is 52% not too high??!!! > > > Around 50% BER is what you would expect from a random signal. 100% BER is > very good since you just need to flip all the bits and you get the right > answer! That is also given the input signal statistics are sufficiently > whitened/random. > incoming bit to 1, next compare the incoming bit to 0. And it will alternately compare incoming bits between 1 and 0. This BER block will probably not be useful if you don't have access (within this flowgraph) to the source generating data. >> >> >> thank you >> >> > > You might want to take a step away from putting blocks in GRC and just take > a look at some of the resources on the GNU Radio wiki about suggested > reading: > > http://gnuradio.org/redmine/projects/gnuradio/wiki/SuggestedReading > http://gnuradio.org/redmine/projects/gnuradio/wiki/SuggestedReadingOrder > > Sanity is hard to come by if you're dealing with magic. If you haven't looked at examples yet you should do that too. They are probably located in /usr/local/share/gnuradio/examples/ There's a BER example at /usr/local/share/gnuradio/examples/digital/demod/ber_simulation.grc > > Good Luck! > > Brian > _______________________________________________ Discussgnuradio mailing list [hidden email] https://lists.gnu.org/mailman/listinfo/discussgnuradio 
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