| Summary: | 碩士 === 國立中央大學 === 通訊工程研究所 === 97 === With the rapid growth of wireless network, to efficient utilization of radio resource in the limitation of spectrum is the key question of wireless communication system. The problem of wireless resource management in broadband cognitive OFDMA (Orthogonal Frequency-Division Multiple Access) is addressed. The objective of resource management is to satisfy the multiple cognitive users’ demands by jointly adjusting their rate, frequency and power resource, under the constraints of multiple primary users’ interference temperature. In addition, the communication system will support various traffic services. Each traffic service needs different levels of QoS. Therefore, channel condition, QoS guarantee are also the main considerations in our cognitive OFDMA system. The problem is formulated as a single objective nonlinear optimization problem using techniques from goal algorithm. The paper proposes the distributed resource algorithm and simulation results are obtained in order to verify the delay guarantee for different traffic types and the near optimal transmission rates.
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