That was really a very clear explanation Thank you so much. Now i got the difference between the terms and also concept behind it
Thanks sandhya On Tue, Dec 3, 2013 at 5:27 PM, Karan Talasila <karan....@gmail.com> wrote: > Hi Sandhya, > You need atleast 2 samples/symbol for demodulation. > Normally when there are sharp transitions in modulated carrier, it results > in high frequency components in the frequency domain. This is a problem > because there will be power across frequencies beyond the bandwidth of the > signal. Hence pulse shaping is employed where the time domain waveform is > smoothened so that all the power in the freq domain is concentrated only > within the bandwidth of signal and that prevents ISI. Hence because the > waveform transitions are smoothened, there will be a need for higher > samples/symbol to demodulate the symbol. > > > On Tue, Dec 3, 2013 at 4:35 PM, Sandhya G <sandhya4...@gmail.com> wrote: > >> Hi karan , >> Thanks for reply . >> well ya in gnuradio also if i set the value of samples/symbol below 2 it >> is throwing me an error . >> So is there any specific reason behind using the value greater than 2? >> and is that higher the value of samples/second the smoother will be the >> waveform? please correct me if i'am wrong . >> >> Thanks >> Sandhya >> >> >> On Tue, Dec 3, 2013 at 4:28 PM, Karan Talasila <karan....@gmail.com>wrote: >> >>> Hi, >>> Bits/symbol depends on modulation scheme that you use to transmit. >>> For BPSK, it is 1 bit/symbol, for QPSK it is 2 bit/symbol and for 64-QAM >>> it is 6 bits/symbol. So you can set it according to modulation scheme you >>> use. >>> >>> Samples/symbol is normally default set to 2. I am not aware in gnuradio >>> but in certain other implementations samples/symbol is kept greater than 2, >>> say 4 or 8 to account for pulse shaping. >>> >>> >>> On Tue, Dec 3, 2013 at 2:33 PM, Sandhya G <sandhya4...@gmail.com> wrote: >>> >>>> Hi everyone, >>>> i'am trying to do simply QAM modulation for that the source i >>>> used is vector source which gives 1byte of 1's and 0's which is fed to QAM >>>> modulator . >>>> >>>> Can anyone tell me how do i calculate samples/symbol .I know the >>>> traditional formula >>>> >>>> samples/symbol=(samples/second)/(symbols/second). >>>> >>>> symbols/sec= (Bits/sec)/(Bits/symbol) >>>> >>>> I having the problem to decide bits/symbol and bits/sec.Please help me >>>> >>>> Thanks >>>> Sandhya >>>> >>>> _______________________________________________ >>>> Discuss-gnuradio mailing list >>>> Discuss-gnuradio@gnu.org >>>> https://lists.gnu.org/mailman/listinfo/discuss-gnuradio >>>> >>>> >>> >>> >>> -- >>> Regards >>> Karan Talasila >>> >> >> > > > -- > Regards > Karan Talasila >
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