Resource allocation with minimum transmit power in multicast OFDM systems  

作　　者：Bo Wu Jun Shen Haige Xiang 

机构地区：[1]School of Electronics Engineering and Computer Science, Peking University, Beijing 100871, R R. China

出　　处：《Journal of Systems Engineering and Electronics》2010年第3期355-360,共6页系统工程与电子技术（英文版）

基　　金：supported by the National High Technology Research and Development Program of China (863 Program) (2008AA01Z226)

摘　　要：To minimize the total transmit power for multicast service in an orthogonal frequency division multiplexing（OFDM） downlink system,resource allocation algorithms that adaptively allocate subcarriers and bits are proposed.The proposed algorithms select users with good channel conditions for each subcarrier to reduce the transmit power,while guaranteeing each user＇s instantaneous minimum rate requirement.The resource allocation problem is first formulated as an integer programming（IP） problem,and then,a full search algorithm that achieves an optimal solution is presented.To reduce the computation load,a suboptimal algorithm is proposed.This suboptimal algorithm decouples the joint resource allocation problem by separating subcarrier and bit allocation.Greedy-like algorithms are employed in both procedures.Simulation results illustrate that the proposed algorithms can significantly reduce the transmit power compared with the conventional multicast approach and the performance of the suboptimal algorithm is close to the optimum.To minimize the total transmit power for multicast service in an orthogonal frequency division multiplexing（OFDM） downlink system,resource allocation algorithms that adaptively allocate subcarriers and bits are proposed.The proposed algorithms select users with good channel conditions for each subcarrier to reduce the transmit power,while guaranteeing each user＇s instantaneous minimum rate requirement.The resource allocation problem is first formulated as an integer programming（IP） problem,and then,a full search algorithm that achieves an optimal solution is presented.To reduce the computation load,a suboptimal algorithm is proposed.This suboptimal algorithm decouples the joint resource allocation problem by separating subcarrier and bit allocation.Greedy-like algorithms are employed in both procedures.Simulation results illustrate that the proposed algorithms can significantly reduce the transmit power compared with the conventional multicast approach and the performance of the suboptimal algorithm is close to the optimum.

关 键 词：resource allocation multicast orthogonal frequency division multiplexing （OFDM） integer programming （IP） greedy algorithm. 

分 类 号：TP338.8[自动化与计算机技术—计算机系统结构] TN929.5[自动化与计算机技术—计算机科学与技术]