Title : 
New Upper Bound for 
 
 -IRSs With 
 
  
         
        
            Author : 
Chang, Yanxun ; Wang, Xiao
         
        
            Author_Institution : 
Inst. of Math., Beijing Jiaotong Univ., Beijing, China
         
        
        
        
        
        
        
            Abstract : 
Impulse radio sequences were first introduced by Chu and Colbourn in 2004. A better upper bound for (m, k, 1)-IRS was given by Gao and Chang in 2006. In this paper, we present an upper bound for (m, k, lambda)-IRS with lambda ges 2, which improves the known Johnson bound.
         
        
            Keywords : 
boundary-elements methods; ultra wideband communication; IRS; Johnson bound; impulse radio sequences; upper bound; Autocorrelation; Binary sequences; Error correction codes; Mathematics; Multiaccess communication; Multimedia systems; Optical fiber LAN; Optical fibers; Upper bound; Impulse radio sequence; optical orthogonal code (OOC); optimal; strictly cyclic packing;
         
        
        
            Journal_Title : 
Information Theory, IEEE Transactions on
         
        
        
        
        
            DOI : 
10.1109/TIT.2009.2025579