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lfsr over GF(4)

I want to create sequences generated by the polynomial x2+αx+1 where coefficients are from F4 s.t. α2+α+1=0. In which α2=α+1 and α3=1.

There are 16 initial states which are:

00,01,0α,0α2

10, 11, 1α, 1α2

α0, α1, αα2, αα2

α20, α21, α2α, α2α2

For example, by starting with initial state αα2, we get 1α + αα2= α+α3= α+1= α2.

Now the sequence is αα2α2. To find the 4. item we will use the new state α2α2 and we get 1α2 + αα2= α2+α3= α2+1= α.

Now the sequence is αα2α2α.

By the same way we get the sequence αα2α2α0αα2α2... of period 5. I could not write the sage code to create the sequence.

lfsr over GF(4)

I want to create sequences generated by the polynomial x2+αx+1 where coefficients are from F4 s.t. α2+α+1=0. In which α2=α+1 and α3=1.

There are 16 initial states which are:

00,01,0α,0α2

10, 11, 1α, 1α2

α0, α1, αα2, αα2

α20, α21, α2α, α2α2

For example, by starting with initial state αα2, we get 1α + αα2= α+α3= α+1= α2.

Now the sequence is αα2α2. To find the 4. item we will use the new state α2α2 and we get 1α2 + αα2= α2+α3= α2+1= α.

Now the sequence is αα2α2α.

By the same way we get the sequence αα2α2α0αα2α2... of period 5. I could not write the sage code to create the sequence.

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updated 2 years ago

FrédéricC gravatar image

lfsr over GF(4)

I want to create sequences generated by the polynomial x2+αx+1 where coefficients are from F4 s.t. α2+α+1=0. In which α2=α+1 and α3=1.

There are 16 initial states which are:

00,01,0α,0α2

10, 11, 1α, 1α2

α0, α1, αα2, αα2

α20, α21, α2α, α2α2

For example, by starting with initial state αα2, we get 1α + αα2= α+α3= α+1= α2.

Now the sequence is αα2α2. To find the 4. item we will use the new state α2α2 and we get 1α2 + αα2= α2+α3= α2+1= α.

Now the sequence is αα2α2α.

By the same way we get the sequence αα2α2α0αα2α2... of period 5. I could not write the sage code to create the sequence.

click to hide/show revision 4
retagged

updated 2 years ago

FrédéricC gravatar image

lfsr over GF(4)

I want to create sequences generated by the polynomial x2+αx+1 where coefficients are from F4 s.t. α2+α+1=0. In which α2=α+1 and α3=1.

There are 16 initial states which are:

00,01,0α,0α2

10, 11, 1α, 1α2

α0, α1, αα2, αα2

α20, α21, α2α, α2α2

For example, by starting with initial state αα2, we get 1α + αα2= α+α3= α+1= α2.

Now the sequence is αα2α2. To find the 4. item we will use the new state α2α2 and we get 1α2 + αα2= α2+α3= α2+1= α.

Now the sequence is αα2α2α.

By the same way we get the sequence αα2α2α0αα2α2... of period 5. I could not write the sage code to create the sequence.