Re: [Discuss-gnuradio] Channel Model

[monika bansal]

Yes ..

Thanks !

On Thu, Aug 6, 2015 at 3:07 PM, Johannes Demel <address@hidden> wrote:

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As a rule of thumb with expected error rate BERe:

num simulation bits: (1 / BERe) * 100
that's more like a minimum. It's probably better to go for * 1000.
Also if you use BER block, it has a parameter ' BER Min. Errors'. As
long as it didn't count at least this amount of errors it'll not
output anything.
Depending on your code and your SNR 8-12dB I'd expect you need at
least 1Gbit or in case of SNR=12dB more towards 100Gbit in order to
obtain meaningful results.
Hope that helps.

On 06.08.2015 11:31, monika bansal wrote:
> 160000 bits for all snr values.,...
>
> On Thu, Aug 6, 2015 at 2:45 PM, Marcus Müller
> <address@hidden> wrote:
>
>> Taking a blind guess here: How many samples do you simulate for
>> Eb/N0 = 8dB? And for 10dB? And for 12dB?
>>
>> Best regards, Marcus
>>
>>
>> On 06.08.2015 10:58, monika bansal wrote:
>>
>> 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
>> <address@hidden> 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 <

>>> <address@hidden>address@hidden> wrote:
>>>
>>>> On Wed, Aug 5, 2015 at 12:51 PM, Martin Braun <
>>>> <address@hidden> address@hidden> 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:digit
al/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>http://corganlabs.com
>>>>
>>>> _______________________________________________
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>>>>
>>>>
>>>
>>>
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