Title :
Variable-weight optical orthogonal codes for CDMA networks with multiple performance requirements
Author_Institution :
Dept. of Electr. Eng., Nat. Chung-Hsing Univ., Taichung, Taiwan
fDate :
1/1/1996 12:00:00 AM
Abstract :
An optical orthogonal code (OOC) is a family of (0,1) sequences with good auto- and cross-correlation properties; they are used as a means to obtain code division multiple access (CDMA) on fiber optic networks. Previous work on OOC has assumed that the weight of each codeword is the same. We consider codes when this assumption is removed. We develop bounds on the size of such “variable-weight” OOC´s and demonstrate techniques to build them. Furthermore, we provide an analysis of the performance of variable-weight OOC in a CDMA network. Varying the weight of a user´s signature sequence affects that user´s performance; therefore this approach is useful for CDMA fiber optic networks with multiple performance requirements
Keywords :
binary sequences; block codes; code division multiple access; correlation theory; optical fibre networks; (0,1) sequences; CDMA networks; auto-correlation properties; code division multiple access; cross-correlation properties; fiber optic networks; multiple performance requirements; optical orthogonal code; user signature sequence; variable-weight codes; Autocorrelation; Binary phase shift keying; Error correction; Hamming weight; Multiaccess communication; Optical devices; Optical fiber networks; Performance analysis; Pulse modulation; Spread spectrum communication;
Journal_Title :
Communications, IEEE Transactions on
