科研之友
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摘要
Variable weight optical orthogonal code (OOC) was introduced by G C Yang for multimedia optical CDMA systems with multiple quality of service (QoS) requirement. In this paper a construction for optimal (v {3 4} 1{s/(s+1) 1/(s+1)}) OOCs is given. For s = 2 it is proved that for each prime v 1 (mod 24) there exists a (v) {3 4} 1 (2/3 1/3}) OOC. A recursive construction for cyclic difference family is also presented. By using these constructions a number of new infinite classes of optimal (v {3 4} 1 Q) OOCs for Q = {1/2 1/2} and {2/3 1/3} are constructed.
