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Analog signal in to Bi-Phase Digital data reconstruction

Started by ravin.rahulin ●September 28, 2013
Hi,

I am trying to reconstruct bi-phase digital data from bi-phase analog
signal. I am sampling analog signal at 4 times of actual data rate. I am
getting ADC output for each sampling instant. 

But, I have no idea about the bi-phase reconstruction logic from sampled
ADC output. Any document document or suggestion would help me.

Thanks in advance

Rahul

	 

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Reply by Vladimir Vassilevsky ●September 28, 20132013-09-28
On 9/28/2013 7:50 AM, ravin.rahulin wrote:

> Hi,
>
> I am trying to reconstruct bi-phase digital data from bi-phase analog
> signal. I am sampling analog signal at 4 times of actual data rate. I am
> getting ADC output for each sampling instant.
>
> But, I have no idea about the bi-phase reconstruction logic from sampled
> ADC output. Any document document or suggestion would help me.
>
> Thanks in advance
>
> Rahul
>
> 	
>
> _____________________________		
> Posted through www.DSPRelated.com
>
Reply by Tim Wescott ●September 28, 20132013-09-28
On Sat, 28 Sep 2013 07:50:29 -0500, ravin.rahulin wrote:


> Hi,
> 
> I am trying to reconstruct bi-phase digital data from bi-phase analog
> signal. I am sampling analog signal at 4 times of actual data rate. I am
> getting ADC output for each sampling instant.
> 
> But, I have no idea about the bi-phase reconstruction logic from sampled
> ADC output. Any document document or suggestion would help me.


Do you mean binary phase-shift keying (BPSK)?  If so, then you need to 
let us know what the carrier frequency is.

-- 
Tim Wescott
Control system and signal processing consulting
www.wescottdesign.com
Reply by Tim Wescott ●September 28, 20132013-09-28
On Sat, 28 Sep 2013 09:55:57 -0500, Vladimir Vassilevsky wrote:


> On 9/28/2013 7:50 AM, ravin.rahulin wrote:
>> Hi,
>>
>> I am trying to reconstruct bi-phase digital data from bi-phase analog
>> signal. I am sampling analog signal at 4 times of actual data rate. I
>> am getting ADC output for each sampling instant.
>>
>> But, I have no idea about the bi-phase reconstruction logic from
>> sampled ADC output. Any document document or suggestion would help me.
>>
>> Thanks in advance
>>
>> Rahul
>>
>>
>> 	
>> _____________________________
>> Posted through www.DSPRelated.com
>>


Oh for crying out loud.  If you're so unhappy with newbies asking typical 
newbie questions, why don't you start your own damned group?  
comp.dsp.experts.only.this.means.vlad.only.ever perhaps?

You must be profoundly lame to get your jollies with such unhelpful 
insults.

-- 
Tim Wescott
Control system and signal processing consulting
www.wescottdesign.com
Reply by Richard Owlett ●September 28, 20132013-09-28
Tim Wescott wrote:

> On Sat, 28 Sep 2013 09:55:57 -0500, Vladimir Vassilevsky wrote:
>
>> On 9/28/2013 7:50 AM, ravin.rahulin wrote:
>>> Hi,
>>>
>>> I am trying to reconstruct bi-phase digital data from bi-phase analog
>>> signal. I am sampling analog signal at 4 times of actual data rate. I
>>> am getting ADC output for each sampling instant.
>>>
>>> But, I have no idea about the bi-phase reconstruction logic from
>>> sampled ADC output. Any document document or suggestion would help me.
>>>
>>> Thanks in advance
>>>
>>> Rahul
>>>
>>>
>>> 	
>>> _____________________________
>>> Posted through www.DSPRelated.com
>>>
>
> Oh for crying out loud.  If you're so unhappy with newbies asking typical
> newbie questions, why don't you start your own damned group?
> comp.dsp.experts.only.this.means.vlad.only.ever perhaps?
>
> You must be profoundly lame to get your jollies with such unhelpful
> insults.
>


I figure he wishes to contribute hot air to global warming ;/

He hasn't quite qualified for my bit-bucket as he has been 
occasionally known to have something to say.
Reply by ravin.rahulin ●September 29, 20132013-09-29
>On Sat, 28 Sep 2013 07:50:29 -0500, ravin.rahulin wrote:
>
>> Hi,
>> 
>> I am trying to reconstruct bi-phase digital data from bi-phase analog
>> signal. I am sampling analog signal at 4 times of actual data rate. I

am

>> getting ADC output for each sampling instant.
>> 
>> But, I have no idea about the bi-phase reconstruction logic from

sampled

>> ADC output. Any document document or suggestion would help me.
>
>Do you mean binary phase-shift keying (BPSK)?  If so, then you need to 
>let us know what the carrier frequency is.
>
>-- 
>Tim Wescott
>Control system and signal processing consulting
>www.wescottdesign.com
>

Hello Tim Wescott,

Actually, the signal I am sampling is demodulated FM signal. Actual carrier
freq is 960MHz and it been down converted to 70MHz IF then demodulated.

Demodulated analog signal data rate is 512Kbps.

Thanks	 

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Reply by Tim Wescott ●September 29, 20132013-09-29
On Sun, 29 Sep 2013 00:27:28 -0500, ravin.rahulin wrote:


>>On Sat, 28 Sep 2013 07:50:29 -0500, ravin.rahulin wrote:
>>
>>> Hi,
>>> 
>>> I am trying to reconstruct bi-phase digital data from bi-phase analog
>>> signal. I am sampling analog signal at 4 times of actual data rate. I
> am
>>> getting ADC output for each sampling instant.
>>> 
>>> But, I have no idea about the bi-phase reconstruction logic from
> sampled
>>> ADC output. Any document document or suggestion would help me.
>>
>>Do you mean binary phase-shift keying (BPSK)?  If so, then you need to
>>let us know what the carrier frequency is.
>>
>>--
>>Tim Wescott Control system and signal processing consulting
>>www.wescottdesign.com
>>
> Hello Tim Wescott,
> 
> Actually, the signal I am sampling is demodulated FM signal. Actual
> carrier freq is 960MHz and it been down converted to 70MHz IF then
> demodulated.
> 
> Demodulated analog signal data rate is 512Kbps.


So what's the signal you're trying to reconstruct?  "Bi-phase" does not 
ring any bells here, and I've been around the block a few times.

-- 
Tim Wescott
Control system and signal processing consulting
www.wescottdesign.com
Reply by ravin.rahulin ●September 29, 20132013-09-29
>On Sun, 29 Sep 2013 00:27:28 -0500, ravin.rahulin wrote:
>
>>>On Sat, 28 Sep 2013 07:50:29 -0500, ravin.rahulin wrote:
>>>
>>>> Hi,
>>>> 
>>>> I am trying to reconstruct bi-phase digital data from bi-phase analog
>>>> signal. I am sampling analog signal at 4 times of actual data rate. I
>> am
>>>> getting ADC output for each sampling instant.
>>>> 
>>>> But, I have no idea about the bi-phase reconstruction logic from
>> sampled
>>>> ADC output. Any document document or suggestion would help me.
>>>
>>>Do you mean binary phase-shift keying (BPSK)?  If so, then you need to
>>>let us know what the carrier frequency is.
>>>
>>>--
>>>Tim Wescott Control system and signal processing consulting
>>>www.wescottdesign.com
>>>
>> Hello Tim Wescott,
>> 
>> Actually, the signal I am sampling is demodulated FM signal. Actual
>> carrier freq is 960MHz and it been down converted to 70MHz IF then
>> demodulated.
>> 
>> Demodulated analog signal data rate is 512Kbps.
>
>So what's the signal you're trying to reconstruct?  "Bi-phase" does not 
>ring any bells here, and I've been around the block a few times.
>
>-- 
>Tim Wescott
>Control system and signal processing consulting
>www.wescottdesign.com



There are few messages transmitted over FM channel. The message data signal
format is bi-phase and its been FM modulated and transmitted.

In receiver, FM carrier down converted and and demodulated. The demodulated
analog signal format is bi-phase and from this analog signal  I have to
recover the bi-phase digital data sent by Transmitted. Just all I need to
find bit 1 or bit 0 from demodulated analog signal 1Vpp. The hard coding
method I mean, Max threshold, min threshold not helping here!!! 

Thanks

>	 


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Reply by Tauno Voipio ●September 29, 20132013-09-29
On 29.9.13 9:06 , ravin.rahulin wrote:

>> On Sun, 29 Sep 2013 00:27:28 -0500, ravin.rahulin wrote:
>>
>>>> On Sat, 28 Sep 2013 07:50:29 -0500, ravin.rahulin wrote:
>>>>
>>>>> Hi,
>>>>>
>>>>> I am trying to reconstruct bi-phase digital data from bi-phase analog
>>>>> signal. I am sampling analog signal at 4 times of actual data rate. I
>>> am
>>>>> getting ADC output for each sampling instant.
>>>>>
>>>>> But, I have no idea about the bi-phase reconstruction logic from
>>> sampled
>>>>> ADC output. Any document document or suggestion would help me.
>>>>
>>>> Do you mean binary phase-shift keying (BPSK)?  If so, then you need to
>>>> let us know what the carrier frequency is.
>>>>
>>>> --
>>>> Tim Wescott Control system and signal processing consulting
>>>> www.wescottdesign.com
>>>>
>>> Hello Tim Wescott,
>>>
>>> Actually, the signal I am sampling is demodulated FM signal. Actual
>>> carrier freq is 960MHz and it been down converted to 70MHz IF then
>>> demodulated.
>>>
>>> Demodulated analog signal data rate is 512Kbps.
>>
>> So what's the signal you're trying to reconstruct?  "Bi-phase" does not
>> ring any bells here, and I've been around the block a few times.
>>
>> --
>> Tim Wescott
>> Control system and signal processing consulting
>> www.wescottdesign.com
>
>
> There are few messages transmitted over FM channel. The message data signal
> format is bi-phase and its been FM modulated and transmitted.
>
> In receiver, FM carrier down converted and and demodulated. The demodulated
> analog signal format is bi-phase and from this analog signal  I have to
> recover the bi-phase digital data sent by Transmitted. Just all I need to
> find bit 1 or bit 0 from demodulated analog signal 1Vpp. The hard coding
> method I mean, Max threshold, min threshold not helping here!!!



There are several things called 'bi-phase'. Are you asking about:

  a) binary phase shift keying (BPSK) or
  b) bi-phase encoding (differential Manchester)?

a) is a method to combine digital data and carrier signal, and
b) is a method to combine data and its clock signal.

-- 

Tauno Voipio
Reply by ravin.rahulin ●September 29, 20132013-09-29
>On 29.9.13 9:06 , ravin.rahulin wrote:
>>> On Sun, 29 Sep 2013 00:27:28 -0500, ravin.rahulin wrote:
>>>
>>>>> On Sat, 28 Sep 2013 07:50:29 -0500, ravin.rahulin wrote:
>>>>>
>>>>>> Hi,
>>>>>>
>>>>>> I am trying to reconstruct bi-phase digital data from bi-phase

analog

>>>>>> signal. I am sampling analog signal at 4 times of actual data rate.

I

>>>> am
>>>>>> getting ADC output for each sampling instant.
>>>>>>
>>>>>> But, I have no idea about the bi-phase reconstruction logic from
>>>> sampled
>>>>>> ADC output. Any document document or suggestion would help me.
>>>>>
>>>>> Do you mean binary phase-shift keying (BPSK)?  If so, then you need

to

>>>>> let us know what the carrier frequency is.
>>>>>
>>>>> --
>>>>> Tim Wescott Control system and signal processing consulting
>>>>> www.wescottdesign.com
>>>>>
>>>> Hello Tim Wescott,
>>>>
>>>> Actually, the signal I am sampling is demodulated FM signal. Actual
>>>> carrier freq is 960MHz and it been down converted to 70MHz IF then
>>>> demodulated.
>>>>
>>>> Demodulated analog signal data rate is 512Kbps.
>>>
>>> So what's the signal you're trying to reconstruct?  "Bi-phase" does

not

>>> ring any bells here, and I've been around the block a few times.
>>>
>>> --
>>> Tim Wescott
>>> Control system and signal processing consulting
>>> www.wescottdesign.com
>>
>>
>> There are few messages transmitted over FM channel. The message data

signal

>> format is bi-phase and its been FM modulated and transmitted.
>>
>> In receiver, FM carrier down converted and and demodulated. The

demodulated

>> analog signal format is bi-phase and from this analog signal  I have to
>> recover the bi-phase digital data sent by Transmitted. Just all I need

to

>> find bit 1 or bit 0 from demodulated analog signal 1Vpp. The hard

coding

>> method I mean, Max threshold, min threshold not helping here!!!
>
>
>There are several things called 'bi-phase'. Are you asking about:
>
>  a) binary phase shift keying (BPSK) or
>  b) bi-phase encoding (differential Manchester)?
>
>a) is a method to combine digital data and carrier signal, and
>b) is a method to combine data and its clock signal.
>
>-- 
>
>Tauno Voipio
>
>


Yes, Its bi-phase data encoding (differential) and its combined with data
and clock. My point is how to determine binary bits ADC sampled output
(sampled after hardware demodulation). 

I am also would like to know about BPSK demodulator. But present post is
created for bi-phase encoding...

Thanks you.

Rahul	 

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