Alocação de recursos de uma rede óptica passiva BS-OFDMA-PON usando otimização multiobjetivo

Abstract

With the growing demand for Internet traffic by users and the increased need for transmission rate by applications, it is necessary to use bandwidth efficiently and economically in optical networks, which plays an important role in improving service delivery. Scalability is an important requirement necessary to meet this demand. To serve it, multiple access can be provided through the OFDMA multiplexing technique (Orthogonal Frequency Division Multiple Access), which allows for flexible bandwidth allocation, in addition to being an efficient solution for ISI (Inter Symbol Interference). Through the variation of the signalto-noise ratio OSNR (Optical Signal to Noise Ratio), the level of modulation by subcarrier and the width of the sub-bands of the ONUs (Optical Network Units), this paper approach this important requirement in the architecture BS (Bandwidth Scalable)-OFDMA-PON (Passive Optical Network) in the communication downlink, by means of the optimization of parameters with Multi-Objective Grey Wolf Optimizer algorithm. The results obtained by the numerical simulation demonstrated in optical links that would vary from 20 to 40 km demonstrated the optimization of the resources allocated to the network in order to attend 16 ONUs and 32 ONUs with individual transmission rates equal to 1Gbps, by adopting 4, 8, 16, 32 and 64-QAM e OSNR mappings ranging between 1 e 50 dB. In the first case, 43.17% of the useful subcarriers were allocated to enable a transmission rate of 1 Gbps for all users, for the highest OSNR found, while in the second situation 68.55 % were allocated.