Abstract
In this paper, a medium access control (MAC) framework tailored for
orthogonal frequency-division multiple access passive optical networks (OFDMA-PONs)
is defined which allows exploiting both the subcarrier and time domains in
a dynamic and flexible way. A dynamic subcarrier assignment algorithm that
respects quality of service by offering decreased average delay is proposed.
Moreover, effective methods to improve its performance and reduce its complexity
are provided. Additionally, the proposed PON MAC framework for the first time
leverages on a cross-layer optimization via adaptive quadrature amplitude
modulation (QAM) per optical network unit (ONU). The performance of all schemes
is evaluated using computer simulations.
© 2012 IEEE
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