Re: [Discuss-gnuradio] samples _per_symbol parameter

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.t86@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 <sandhya4343@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

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Regards
Karan Talasila