Opportunistic Scheduling of Delay Sensitive Traffic in OFDMA-BasedWireless
WOWMOM '06 Proceedings of the 2006 International Symposium on on World of Wireless, Mobile and Multimedia Networks
Cross-layer QoS Analysis of Opportunistic OFDM-TDMA and OFDMA Networks
IEEE Journal on Selected Areas in Communications
Feasibility of SINR guarantees for downlink transmissions in relay-enabled OFDMA networks
Automatica (Journal of IFAC)
Efficient resource allocation algorithm for OFDMA systems with delay constraint
Computer Communications
Dynamic Subcarrier-based Resource Allocation Algorithm in Wireless Networks
Proceedings of International Conference on Advances in Mobile Computing & Multimedia
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Adaptive resource allocation including the allocation of subcarrier, bit and power in orthogonal frequency division multiple access (OFDMA) system, can significantly improve spectral efficiency, increase capacity, and reduce power consumption. The resource allocation in an OFDMA system is normally modeled as a combinatorial optimization problem involving a nonlinear objective with nonlinear constraints. This leads to high computation complexity that is only solvable online. In this paper we first develop a nonlinear optimization model of OFDMA resource allocation that incorporates not only the throughput constraint but also the delay constraint. We then find an equivalent linear formulation to this optimization problem to facilitate analysis. Moreover, we develop a heuristic approximation algorithm to provide a close solution to the equivalent linear programming problem. The heuristic algorithm is efficient enough for on-line adaptive resource allocation. Simulation results show that the heuristic solution can achieve almost same capacity but with less computation complexity.