CHAOTIC SPECTRUM EXPANSION CODES AND THEIR CREATION

摘要

1. A method of creating a set of spreading codes, the set having a predetermined cardinality, and the method includes! determining the first and second chaotic pseudo-random noise codes, while the first and second pseudo-random noise codes have delta-like functions of the autocorrelation function and the low cross-correlation function,! determining the following pseudo-random noise codes by performing steps! (a) creating the next pseudo-random noise code by calculation! ! where k is the positive integral index, Dk is the next pseudo-random noise code, C1 is the first pseudo-random noise code, C2 is the second pseudo-random noise code, F is a binary function based on the basic binary operations, and Tk is the operator that cyclically shifts the code by k chip positions; ! (b) adding a pseudo-random noise code Dk to the set containing the first and second pseudo-random noise codes if the pseudo-random noise code Dk has similar delta functions as autocorrelation functions and low cross-correlation functions with already defined pseudorandom noise codes; ! (c) rejecting the pseudo-random noise code Dk if the conditions for adding to the set of already defined pseudo-random noise codes of step (b) are not satisfactory; ! (d) modifying (increasing or decreasing) the index k and repeating steps (a) to (d) until the cardinal number of the set of certain pseudo-random noise codes reaches the cardinality of the set of spreading codes to be created. ! 2. The method according to claim 1, in which the first chaotic pseudo-random noise