Qiaoyun Sun

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In this paper, the inter-cell interference coordination (ICIC) is investigated for the downlink transmission in OFDMA-based multi-cellular systems. The utility function is introduced to balance efficiency and fairness. Firstly, the system model is built based on the resource allocation rules of soft frequency reuse (SFR) and the utility-based optimization(More)
—For UTRAN Long Term Evolution (LTE) systems, inter-cell interference is the most important interference source. Inter-cell interference coordination (ICIC) is considered to improve coverage and increase data rate at cell edge. The current consensus of ICIC scheme is towards semi-static soft frequency reuse (SFR). Due to the limitation of resource(More)
This paper considers the scheduling and resource allocation problem for downlink OFDMA/SDMA systems with the objective to maximize the system capacity and guarantee each user's QoS requirements. A mathematical formulation of the optimization problem is established based on utility function, and then the detailed proof of the equivalent optimal policy is(More)
In this paper, we propose a novel cross layer packet scheduling algorithm for real time (RT) traffics in multiuser downlink MIMO-OFDMA wireless systems. The algorithm dynamically allocates the resources in space, time and frequency domain based on the channel state information (CSI), users' quality of service (QoS) requirements and queue state information(More)
In this paper, dynamic resource allocation problems for multi-user downlink MIMO-OFDMA are investigated. With the goal of minimizing the total transmit power under condition that QoS of different users can be guaranteed, a novel dynamic resource allocation algorithm is proposed. First of all, a new subcarrier allocation policy is given based on the perfect(More)