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Optimal biphase sequences with large linear complexity derived from sequences over Z4

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2 Author(s)
Udaya, P. ; Central Res. Lab., Bangalore, India ; Siddiqi, M.

New families of biphase sequences of size 2r-1+1, r being a positive integer, are derived from families of interleaved maximal-length sequences over Z4 of period 2(2r-1). These sequences have applications in code-division spread-spectrum multiuser communication systems. The families satisfy the Sidelnikov bound with equality on θmax, which denotes the maximum magnitude of the periodic cross-correlation and out-of-phase autocorrelation values. One of the families satisfies the Welch bound on θmax with equality. The linear complexity and the period of all sequences are equal to r(r+3)/2 and 2(2 r-1), respectively, with an exception of the single m-sequence which has linear complexity r and period 2r-1. Sequence imbalance and correlation distributions are also computed

Published in:

Information Theory, IEEE Transactions on  (Volume:42 ,  Issue: 1 )

Date of Publication:

Jan 1996

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