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This paper investigates the joint optimization of multiuser packet scheduling and wireless resource allocation for video communications over downlink orthogonal frequency-division multiple-access (OFDMA) systems. The objective is to maximize the expected video quality of all mobile users under the wireless resource and delay-bound constraints. We formulate a quality-driven cross-layer problem to jointly optimize the packet scheduling and subcarrier assignment. Using a dual approach, an asymptotically optimal solution is derived to efficiently solve the problem. Furthermore, we propose a suboptimal algorithm to reduce the computational complexity such that the requirements of real-time video applications can be satisfied. Finally, the computational complexity of the algorithms is analyzed, and numerical simulations are carried out to evaluate the performance of the proposed algorithms.