基于分簇的多用户OFDM自适应资源分配方案
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摘要
针对正交频分复用自适应资源分配中算法复杂度和系统容量的问题,提出了一种联合子载波分配和功率分配的方案。在子载波分配中,将频带内相邻的子载波合为子载波簇,对用户速率进行比例约束,根据预设的比例为用户分配子载波簇;在功率分配中,根据子载波分配完毕后的用户速率比例,为用户分配功率,再利用注水算法解决单用户下子载波的功率分配问题。仿真结果表明,所提出的方案不仅可以有效降低算法的复杂度,而且提高了系统容量,从而证明了方案的可行性。
Aiming at the complexity and system capacity of orthogonal frequency division multiplexing adaptive resource allocation,this paper proposes a joint subcarrier allocation and power allocation scheme. In the subcarrier allocation, the adjacent subcarriers in the frequency band are combined into subcarrier clusters. The user rate is proportionally restricted, and the subcarriers clusters is assigned to user according to a preset ratio. In the power allocation, the power is allocated to the user according to the ratio of the user rate after the subcarriers are allocated, and then the water injection algorithm is used to solve the problem of subcarrier alloca-tion for single user. The simulation results show that the proposed scheme can not only effectively reduce the complexity of the al-gorithm, but also increase the system capacity, which proves the feasibility of the scheme.
Aiming at the complexity and system capacity of orthogonal frequency division multiplexing adaptive resource allocation,this paper proposes a joint subcarrier allocation and power allocation scheme. In the subcarrier allocation, the adjacent subcarriers in the frequency band are combined into subcarrier clusters. The user rate is proportionally restricted, and the subcarriers clusters is assigned to user according to a preset ratio. In the power allocation, the power is allocated to the user according to the ratio of the user rate after the subcarriers are allocated, and then the water injection algorithm is used to solve the problem of subcarrier alloca-tion for single user. The simulation results show that the proposed scheme can not only effectively reduce the complexity of the al-gorithm, but also increase the system capacity, which proves the feasibility of the scheme.
引文
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[4]SHEN Z,ANDREWS J G,EVANS B L.Adaptive resource allocation in multiuser OFDM systems with proportional rate constraints[J].IEEE Transactions on Wireless Communications,2005,4(6):2726-2737.
[5]Dan Lilin,Zhang Chiheng,Yuan Jie,et al.Improved N-continuous OFDM using adaptive power allocation[C].2018IEEE 8th Aunual Computing and Communication Workshop and Conferences,2018.
[6]袁建国,王竟鑫,张芳.基于公平度和惩罚函数的OFDMA自适应资源分配[J].系统工程与电子技术,2017,40(2):427-434.
[7]袁建国,王竟鑫,张芳.基于人工蜂群算法的多用户OFDM自适应资源分配[J].吉林大学学报(工学版),2017,42(4):31-35.
[8]Liu Zhijun,Tao Xiaofeng,REHMAN W U.Resource allocation for two-way amplify and forward OFDM relay networks[J].China Communications,2017,14(8):76-82.
[9]LIU M,LI X,ZHANG M,et al.Research on artificial fish swarm algorithm with cultural evolution for subcarrier allocation[J].International Journal of Hybrid Information Technology,2015,8(6):279-288.
[10]YIN Z,ZHUANG S,WU Z,et al.Rate adaptive based resource allocation with proportional fairness constraints in OFDMA systems[J].Sensors,2015,15(10):24996-25014.
[11]程超,钱志鸿,李春兰,等.OFDM-UWB系统基于用户速率的多用户动态资源分配算法[J].通信学报,2012,33(9):160-167.
[12]Xu Wenjun,Li Xue,LEE C H,et al.Joint sensing duration adaptation,user matching,and power allocation for cognitive OFDM-NOMA system[J].IEEE Transactions on Wireless Communications,2018,17(2):1269-1282.
[2]LING X,WU B,HO P H,et al.Fast water-filling for agile power allocation in multi-channel wireless communications[J].IEEE Communications Letters,2012,16(8):1212-1215.
[3]王大鸣,陈松,崔维嘉,等.多用户MIMO-OFDM系统基于QoE效用函数的跨层资源分配[J]通信学报,2014,9(9):175-183.
[4]SHEN Z,ANDREWS J G,EVANS B L.Adaptive resource allocation in multiuser OFDM systems with proportional rate constraints[J].IEEE Transactions on Wireless Communications,2005,4(6):2726-2737.
[5]Dan Lilin,Zhang Chiheng,Yuan Jie,et al.Improved N-continuous OFDM using adaptive power allocation[C].2018IEEE 8th Aunual Computing and Communication Workshop and Conferences,2018.
[6]袁建国,王竟鑫,张芳.基于公平度和惩罚函数的OFDMA自适应资源分配[J].系统工程与电子技术,2017,40(2):427-434.
[7]袁建国,王竟鑫,张芳.基于人工蜂群算法的多用户OFDM自适应资源分配[J].吉林大学学报(工学版),2017,42(4):31-35.
[8]Liu Zhijun,Tao Xiaofeng,REHMAN W U.Resource allocation for two-way amplify and forward OFDM relay networks[J].China Communications,2017,14(8):76-82.
[9]LIU M,LI X,ZHANG M,et al.Research on artificial fish swarm algorithm with cultural evolution for subcarrier allocation[J].International Journal of Hybrid Information Technology,2015,8(6):279-288.
[10]YIN Z,ZHUANG S,WU Z,et al.Rate adaptive based resource allocation with proportional fairness constraints in OFDMA systems[J].Sensors,2015,15(10):24996-25014.
[11]程超,钱志鸿,李春兰,等.OFDM-UWB系统基于用户速率的多用户动态资源分配算法[J].通信学报,2012,33(9):160-167.
[12]Xu Wenjun,Li Xue,LEE C H,et al.Joint sensing duration adaptation,user matching,and power allocation for cognitive OFDM-NOMA system[J].IEEE Transactions on Wireless Communications,2018,17(2):1269-1282.