Optical code division multiple access (OCDMA) passive optical network (PON) can find wide applications in the next optical access network. One of its key techniques of is construction of address code. Aiming at the facts that(F,K,1) optical orthogonal code (OOC) possesses good performance but capacity is small, and number of users in OCDMA PON is not very big thereafter OOC auto-correlation or cross-correlation may not be very strict,(F,K,2) OOC can be used as address codes for OCDMA PON. In this paper, the method of constructingOOC based on block design is discussed. The algorithm of construction (F,K,2) of OOC from block design is presented and simulated; several groups of(F,K,2) OOC are gained. The results show that the algorithm has good astringency and simplicity. It can construct(F,K,2) OOC effectively. It is feasible.
To ensure different priorities of different services, for instance the voice, video and data, EPON dynamic bandwidth allocation algorithm must be able to accurately predict frames between the two authorizations. In respect to this problem,this paper presents a multi-queue scheduling EPON dynamic bandwidth allocation algorithm on the basis of the least mean square prediction and illustrates the specific algorithm as well as the algorithm simulation. Simulation results show that this scheme can predict the frames of high-priority services and reasonably allocates bandwidth based on the predictions. Thus the scheme fundamentally avoids light load penalty and reduces the delay of high priority services.
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