Re: [Discuss-gnuradio] difference b/w sample rate and symbols per second

[Vanush Vaswani]

You may refer to this example to see how to transmit 9.6kbps GFSK
signal through an AWGN channel.

https://www.youtube.com/watch?v=N1hR6VgWeow&feature=youtu.be



On Sun, Jul 6, 2014 at 12:00 AM, Marcus Müller <address@hidden> wrote:
> We might be talking about different blocks.
> I'm referring to gr::analog::frequency_modulator_fc, where the
> documentation only says[1]
>
> radians/sample = amplitude * sensitivity
>
> From what you paste as formulas this does not look like the general
> frequency modulation, but like a digital modulation scheme, e.g. GMSK.
>
> Anyway, we will not be able to tell you what you'll need to use as
> parameters for your transmitter -- that is something that you, based on
> your communication engineering skills, will need to decide yourself.
>
> Sincerely,
> Marcus Müller
>
> [1]http://gnuradio.org/doc/doxygen/classgr_1_1analog_1_1frequency__modulator__fc.html#a9c252eeb8c9daf6ccd50427d3bc55bd3
>
> On 05.07.2014 09:59, jason sam wrote:
>> Sorry for prolonging the discussion but I am a bit confused here.The
>> sensitivity parameter for Freq Mod block is defined as:
>>
>> sensitivity = (pi * modulation_index) / samples_per_symbol
>> where,
>>
>> modulation_index = deviation / (baud_rate / 2)
>>
>> So what values should i plug in for samples_per_symbol and baud_rate
>> in the formulas?
>>
>>
>> On Fri, Jul 4, 2014 at 9:14 PM, Marcus Müller <address@hidden> wrote:
>>> Not at all, because for these blocks, symbols have no meaning.
>>>
>>> On 04.07.2014 17:38, jason sam wrote:
>>>> Yes Marcus,u are r right and i am also asking about such blocks like
>>>> the FM Mod block..In this block u have an option to set sample rate
>>>> but how can u set samples per symbol??
>>>>
>>>> On Fri, Jul 4, 2014 at 6:08 PM, Marcus Müller <address@hidden> wrote:
>>>>> Hi Ali,
>>>>> as said several times: Sampling rate, samples per symbol etc are
>>>>> concepts that are meaningful only for certain blocks, and thus there is
>>>>> no sense in setting those globally.
>>>>>
>>>>> Greetings,
>>>>> Marcus
>>>>> On 04.07.2014 08:33, jason sam wrote:
>>>>>> Thanx Martin,but where in GRC we can set samples per symbol??I am new
>>>>>> to this so i don't know yet...
>>>>>>
>>>>>> Ali
>>>>>>
>>>>>> On Tue, Jul 1, 2014 at 2:18 PM, Martin Braun <address@hidden> wrote:
>>>>>>> On 06/26/2014 11:06 AM, jason sam wrote:
>>>>>>>> I am bit confused b/w the two terms.I have read some material and i
>>>>>>>> got the following relationship b/w the two:
>>>>>>>> samples/second =samples/symbol * symbols/second
>>>>>>>> And i think in GRC samples per symbol is 1(plz correct if i am
>>>>>>>> wrong).So sample rate becomes equal to baud rate(symbols/second)??
>>>>>>> samples per symbol is whatever you set it to; common values are 2 and 4
>>>>>>> (this also depends on the modulation used). Higher values are often used
>>>>>>> for demo purposes.
>>>>>>>
>>>>>>> M
>>>>>>>
>>>>>>>
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