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Re: [Discuss-gnuradio] Miller/Delay decoding

From: Achilleas Anastasopoulos
Subject: Re: [Discuss-gnuradio] Miller/Delay decoding
Date: Sun, 27 Jun 2010 17:16:51 -0400


I can help.
Can you describe VERY PRECISELY and concisely the encoding you are
trying to implement.
Once you do that I will help you construct the right FSM to describe it.


On Thu, Jun 24, 2010 at 5:16 PM, Dora Pa <address@hidden> wrote:
> Hi Achilleas.
> I've tried to describe an FSM and understand trellis but it seems that
> I'm not smart enough (have no experience with FSMs/trellis). Maybe you
> can help me.
> I got so far:
> 4 outputs: There are 4 kinds of outputs  = {1,00,01, previousBit}
> 2 inputs = state of the signal = {High, Low}
> 2 states = I assume this is the last bit so = {0,1}
> But I'm not sure about this. Because Miller does depend as far is I
> understand, on the delay between the edges.
> Is there an easier way to do this? I've tried to write a code block
> based on the bit-slicer code (count till an edge -> reset counter ->
> count till the next edge ... and then to decode the signal based on
> the length of the gap) but the results are weren't repeatable.
> Dora
> 2010/6/22 Achilleas Anastasopoulos <address@hidden>:
>> Dora,
>> you can describe Miller encoding with an FSM with 2 states 2 inputs and 4
>> outputs. Once you do that both encoding and decoding can be done easily
>> using the gr-trellis framework.
>> Achilleas

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