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Calculation of cyclic shift in case of restricted set in RAC
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Soumendra
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PostPosted: Mon Nov 17, 2008 10:03 pm    Post subject: Calculation of cyclic shift in case of restricted set in RAC Reply with quote
Hi,

I am having some problem in calculating cyclic shift from uth root of
Zadoff chu sequence for RACH preamble for restricted sets.

one of the equations is like du= 1/u mod Nzc for 0<= 1/u mod Nzc< Nzc/2

How can one do modulo operation on a fraction since physical root u is an
integer and modulo is defined only for integers.

I might be missing a very vital point here in my analogy. Please help me.


For more details please refer 3GPP TS 36.211 v 8.3.0 section 5.7.2
Preamble Sequence Generation from the following site:
www.3gpp.org/ftp/specs/html-info/36211.htm

Any help in this regard will be highly appreciated.
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$B>U0BM'(B
Guest
PostPosted: Tue Dec 09, 2008 3:04 am    Post subject: Re: Calculation of cyclic shift in case of restricted set in Reply with quote
On Nov 18, 12:03 am, "Soumendra" <soumendra_pa...@rediffmail.com>
wrote:
Quote:
Hi,

I am having some problem in calculating cyclic shift from uth root of
Zadoff chu sequence for RACH preamble for restricted sets.

one of the equations is like du= 1/u mod Nzc for 0<= 1/u mod Nzc< Nzc/2

How can one do modulo operation on a fraction since physical root u is an
integer and modulo is defined only for integers.

I might be missing a very vital point here in my analogy. Please help me.

For more details please refer  3GPP TS 36.211 v 8.3.0 section 5.7.2
Preamble Sequence Generation from the following site:www.3gpp.org/ftp/specs/html-info/36211.htm

Any help in this regard will be highly appreciated.

'1/u mod Nzc' means that, we have to find a number 'X' (between 0 and
Nzc-1), which satisfies the following equation:
X * u = 1 mod Nzc

As Nzc is a prime, only one solution X surely exsits, and this X will
be denoted as '1/u'
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