Title :
Costas arrays and the Lovász Local Lemma
Author :
Correll, Bill ; Swanson, Christopher N. ; Ho, Randy W.
Author_Institution :
MDA Inf. Syst. LLC, Ypsilanti, MI, USA
Abstract :
We propose a fundamentally new approach to studying the existence of Costas arrays. We explore the consequences of applying new formulations of the Lovász Local Lemma in an effort to apply the probabilistic method to show that Costas arrays of a given order n must exist. Our applications of the Lovász Local Lemma make use of a characterization of all O(n6) configurations of ones within a permutation matrix whose existence violates the definition of a Costas array. We show that this approach can at least be used to establish the existence of arrays of orders 3 - 5 and also can be applied to prove the existence of frequency-hopping waveforms of all orders satisfying many subsets of at least n(n - 1)(n - 2)2 - 2 of the violating constraints.
Keywords :
matrix algebra; spread spectrum radar; Costas array; Loveasz Local Lemma; frequency hopping waveform; permutation matrix; probabilistic method; Doppler shift; Linear matrix inequalities; MATLAB; Object detection; Optimization; Probabilistic logic; Time-frequency analysis;
Conference_Titel :
Radar Conference (RadarCon), 2015 IEEE
Conference_Location :
Arlington, VA
Print_ISBN :
978-1-4799-8231-8
DOI :
10.1109/RADAR.2015.7130993