Periodicity and Correlation Properties of d-FCSR Sequences

  • Authors:
  • Mark Goresky;Andrew Klapper

  • Affiliations:
  • School of Mathematics, Institute for Advanced Study, Princeton N.J. 08540 goresky@ias.edu;Department of Computer Science, 779A Anderson Hall, University of Kentucky, Lexington, KY 40506-0046 klapper@cs.uky.edu

  • Venue:
  • Designs, Codes and Cryptography
  • Year:
  • 2004

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Abstract

A d-feedback-with-carry shift register (d-FCSR) is a finite state machine, similar to a linear feedback shift register (LFSR), in which a small amount of memory and a delay (by d-clock cycles) is used in the feedback algorithm (see Goresky and Klapper [4,5]). The output sequences of these simple devices may be described using arithmetic in a ramified extension field of the rational numbers. In this paper we show how many of these sequences may also be described using simple integer arithmetic, and consequently how to find such sequences with large periods. We also analyze the “arithmetic cross-correlation” between pairs of these sequences and show that it often vanishes identically.