Yes Marcus... and i used delay block at the output of the demodulator to make output bits align with input bits. Now it is tracing the theoretical curve till 9 db but after that error is not reducing.
I am attaching the curve. Why is this happening ?? On Thu, Aug 6, 2015 at 2:03 PM, Marcus Müller <marcus.muel...@ettus.com> wrote: > How should i calculate the error now? > > That pretty much depends on what *you* want to measure -- obviously, > these bits are lost, so practically, this increases your BER. > If you want to demonstrate asymptotic behaviour, however, then you could > just increase the length of your simulation until a few bits lost at start > and end just don't matter anymore. > > Greetings, > Marcus > > > On 06.08.2015 06:47, monika bansal wrote: > > Hii > Thanks for your responses. > > The problem is this channel model is eating some initial 6 bits(3 qpsk > symbols) and last 10 bits(5 qpsk symbols). > Because of this index of output symbol is different fron input which is > resulting in error for all snr ranges. > You can see the output for noise_volage =0.0 > > Input = (0L, 0L, 2L, 3L, 1L, 2L, 1L, 1L, 2L, 3L, 0L, 1L, 0L, 1L, 1L, 3L, > 2L, 3L, 1L, 0L, 2L, 0L, 3L, 2L, 2L, 1L, 3L, 2L, 3L, 0L, 2L, 2L, 0L, 1L, 2L, > 3L, 3L, 0L, 2L, 2L, 0L, 2L, 3L, 3L, 2L, 2L, 3L, 0L, 0L, 0L, 1L, 0L, 2L, 2L, > 2L, 0L, 3L, 0L, 1L, 1L, 3L, 0L, 1L, 3L, 3L, 3L, 0L, 0L, 2L, 0L, 1L, 1L, 0L, > 2L, 3L, 2L, 2L, 3L, 2L, 3L) > > Output = (3L, 1L, 2L, 1L, 1L, 2L, 3L, 0L, 1L, 0L, 1L, 1L, 3L, 2L, 3L, 1L, > 0L, 2L, 0L, 3L, 2L, 2L, 1L, 3L, 2L, 3L, 0L, 2L, 2L, 0L, 1L, 2L, 3L, 3L, 0L, > 2L, 2L, 0L, 2L, 3L, 3L, 2L, 2L, 3L, 0L, 0L, 0L, 1L, 0L, 2L, 2L, 2L, 0L, 3L, > 0L, 1L, 1L, 3L, 0L, 1L, 3L, 3L, 3L, 0L, 0L, 2L, 0L, 1L, 1L, 0L, 2L, 3L) > > > Input = (0L, 1L, 0L, 2L, 0L, 1L, 1L, 3L, 2L, 3L, 3L, 1L, 0L, 2L, 2L, 0L, > 0L, 1L, 1L, 1L, 0L, 0L, 3L, 2L, 3L, 1L, 1L, 2L, 1L, 0L, 3L, 0L, 0L, 0L, 3L, > 0L, 3L, 2L, 1L, 0L, 3L, 1L, 3L, 1L, 1L, 3L, 1L, 2L, 0L, 1L, 0L, 3L, 1L, 0L, > 3L, 2L, 1L, 2L, 3L, 3L, 2L, 1L, 3L, 0L, 1L, 2L, 3L, 3L, 0L, 0L, 0L, 2L, 3L, > 3L, 1L, 3L, 3L, 1L, 0L, 3L) > > Output = (2L, 0L, 1L, 1L, 3L, 2L, 3L, 3L, 1L, 0L, 2L, 2L, 0L, 0L, 1L, 1L, > 1L, 0L, 0L, 3L, 2L, 3L, 1L, 1L, 2L, 1L, 0L, 3L, 0L, 0L, 0L, 3L, 0L, 3L, 2L, > 1L, 0L, 3L, 1L, 3L, 1L, 1L, 3L, 1L, 2L, 0L, 1L, 0L, 3L, 1L, 0L, 3L, 2L, 1L, > 2L, 3L, 3L, 2L, 1L, 3L, 0L, 1L, 2L, 3L, 3L, 0L, 0L, 0L, 2L, 3L, 3L, 1L) > > How should i calculate the error now? > Should i use Delay block? > > On Thu, Aug 6, 2015 at 2:34 AM, Johnathan Corgan < > <johnat...@corganlabs.com>johnat...@corganlabs.com> wrote: > >> On Wed, Aug 5, 2015 at 12:51 PM, Martin Braun <martin.br...@ettus.com> >> wrote: >> >> >>> Try >>> >>> noise_voltage = self.EbN0_to_noise_voltage(EbN0)/sqrt(2) >>> >>> the original berawgn.py was already buggy, because it didn't follow a >>> recent change in the noise power. I've submitted a patch, but it >>> probably won't be merged before the release cycle is reset (cf >>> >>> https://github.com/gnuradio/gnuradio/compare/master...mbr0wn:digital/berawgn_fix_noisepower?expand=1 >>> ). >> >> >> This did get merged for 3.7.8 release. >> >> >> -- >> Johnathan Corgan >> Corgan Labs - SDR Training and Development Services >> Intro to SDR Class - Aug. 31-Sep. 1, Columbia, MD >> Intro to SDR Class - Sep. 3-4, Santa Clara, CA >> http://corganlabs.com >> >> _______________________________________________ >> Discuss-gnuradio mailing list >> Discuss-gnuradio@gnu.org >> https://lists.gnu.org/mailman/listinfo/discuss-gnuradio >> >> > > > _______________________________________________ > Discuss-gnuradio mailing > listDiscuss-gnuradio@gnu.orghttps://lists.gnu.org/mailman/listinfo/discuss-gnuradio > > > > _______________________________________________ > Discuss-gnuradio mailing list > Discuss-gnuradio@gnu.org > https://lists.gnu.org/mailman/listinfo/discuss-gnuradio > >
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