PN SEQUENCE (zero values)
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From: Avier on 4 Feb 2010 15:19 just for check IS there any way to produce a PN sequence from all zero intial state. that is all zeros in shift regiters
From: John on 4 Feb 2010 15:45 On Feb 4, 3:19 pm, "Avier" <shahanwark...(a)hotmail.com> wrote: > just for check > > IS there any way to produce a PN sequence from all zero intial state. > > that is all zeros in shift regiters I believe the all-zeros state is never legal because it would cause all subsequent outputs to be zero.
From: Avier on 4 Feb 2010 15:52 >On Feb 4, 3:19=A0pm, "Avier" <shahanwark...(a)hotmail.com> wrote: >> just for check >> >> IS there any way to produce a PN sequence from all zero =A0intial state. >> >> that is all zeros in shift regiters > >I believe the all-zeros state is never legal because it would cause >all subsequent outputs to be zero. > thats the question can we come out of all zeros state
From: Rob Gaddi on 4 Feb 2010 16:07 On Thu, 04 Feb 2010 14:52:27 -0600 "Avier" <shahanwarkhan(a)hotmail.com> wrote: > >On Feb 4, 3:19=A0pm, "Avier" <shahanwark...(a)hotmail.com> wrote: > >> just for check > >> > >> IS there any way to produce a PN sequence from all zero =A0intial > state. > >> > >> that is all zeros in shift regiters > > > >I believe the all-zeros state is never legal because it would cause > >all subsequent outputs to be zero. > > > > thats the question can we come out of all zeros state A LFSR based PN sequence can be implemented using XOR or XNOR feedback. One generates a system in which all-zeros is the hang state. For the other, all-ones is the hang state instead. -- Rob Gaddi, Highland Technology Email address is currently out of order
From: Vladimir Vassilevsky on 4 Feb 2010 16:08
John wrote: > On Feb 4, 3:19 pm, "Avier" <shahanwark...(a)hotmail.com> wrote: > >>just for check >> >>IS there any way to produce a PN sequence from all zero intial state. >> >>that is all zeros in shift regiters > > > I believe the all-zeros state is never legal because it would cause > all subsequent outputs to be zero. You can modify LSFR by sticking an additional invertor into it. This will take care of all zero state however the sequence will stil have 2^N - 1 "normal" states. VLV |