Abstract
Cross-layer design is an effective technique for future mobile communication systems.A cross-layer resource allocation algorithm with partial channel state information was explored to maximize the total system throughput for multi-user MIMO-OFDM(Multiple Input Multiple Output-Orthogonal Frequency Division Multiplexing) system.The objective function of the optimization problem was designed based on the power limitation constraint,transmission rate,average queue length and sub-carrier occupancy,Quality of Service(QoS) requirements of different services and queue state information of data link layer.Under the condition of finite-length user buffer in data link layer,the mean feedback model was utilized to describe the feedback process of channel state information,and then the corresponding cross-layer resource allocation criteria could be derived.The simulation results show that compared with the existing schemes,the proposed algorithms obtain reasonable throughput performance and reduce lost package rate while providing better QoS requirement for each user of different services.
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