基于人工蜂群算法的多用户OFDM自适应资源分配方案
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摘要
针对多用户正交频分复用(OFDM)自适应资源分配中用户公平性和系统容量的问题,本文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,首先确定每个用户需要的子载波数量,然后根据用户的速率比例继续分配子载波,最后分配剩余子载波。在功率分配中,通过人工蜂群(ABC)算法的全局搜索实现在所有用户之间的功率寻优,并利用等功率的分配方式对每个用户的子载波进行单用户功率分配。从仿真结果中可以看出,本文算法不仅可以兼顾用户的公平性,同时也有效地提高了系统的吞吐量,从而证明了本文算法的有效性。
To solve the problems of user fairness and system capacity in adaptive resource allocation for multi-user Orthogonal Frequency Division Multiplexing(OFDM),a scheme of combining subcarrier allocation and power allocation is proposed.In the subcarrier allocation,the number of subcarriers required by each user is determined first,then the subcarriers are continuously allocated according to the users' rate proportionality,and finally the remaining subcarriers are allocated.In the power allocation,the power optimization among all users is achieved through global search using Artificial Bee Colony(ABC)algorithm,and the equal power allocation method is used to carry out single-user power allocation of subcarriers to each user.Simulation results show that the proposed scheme not only takes into account the user fairness,but also effectively improves the throughput of the system,thus proving the effectiveness of proposed scheme.
To solve the problems of user fairness and system capacity in adaptive resource allocation for multi-user Orthogonal Frequency Division Multiplexing(OFDM),a scheme of combining subcarrier allocation and power allocation is proposed.In the subcarrier allocation,the number of subcarriers required by each user is determined first,then the subcarriers are continuously allocated according to the users' rate proportionality,and finally the remaining subcarriers are allocated.In the power allocation,the power optimization among all users is achieved through global search using Artificial Bee Colony(ABC)algorithm,and the equal power allocation method is used to carry out single-user power allocation of subcarriers to each user.Simulation results show that the proposed scheme not only takes into account the user fairness,but also effectively improves the throughput of the system,thus proving the effectiveness of proposed scheme.
引文
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[2]Iqdour R,Jabrane Y.Wavelet networks for reducing the envelope fluctuations in wirelessman-OFDM systems[J].Digital Communications and Networks,2016,2(2):77-83.
[3]朱继华,王竟鑫,申茜,等.OFDM系统中一种改进的低复杂度自适应比特功率分配算法[J].重庆邮电大学学报:自然科学版,2017,29(2):202-207.Zhu Ji-hua,Wang Jing-xin,ShenQian,et al.An improved adaptive bit power allocation algorithm with the low complexity for OFDM system[J].Journal of Chongqing University of Posts and Telecommunications(Natural Science Edition),2017,29(2):202-207
[4]Wong I C,Evans B L.Optimal downlink OFDMA resource allocation with linear complexity to maximize ergodic rates[J].IEEE Transactions on Wireless Communications,2008,7(3):962-971.
[5]Var P,Shrestha R,Kim J M.Improved power allocation to enhance the capacity in OFDMA system for proportional resource allocation[J].The Journal of Korean Institute of Communications and Information Sciences,2013,38(7):580-591.
[6]Yin Z,Zhuang S,Wu Z,et al.Rateadaptive based resource allocation with proportional fairness constraints in OFDMA systems[J].Sensors,2015,15(10):24996-25014.
[7]Abd-Elnaby M,Sedhom G G,Messiha N W,et al.Fair subcarrier-power allocation scheme for multiuser multicarrier systems[J].Journal of Central South University,2015,22(8):3033-3041.
[8]Zhao W,Wang S.Joint subchannel and power allocation in multiuser OFDM systems with minimal rate constraints[J].International Journal of Communication Systems,2014,27(1):1-12.
[9]Ren Z,Chen S,Hu B,et al.Proportional resource allocation with subcarrier grouping in OFDM wireless systems[J].IEEE Communications Letters,2013,17(5):868-871.
[10]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.
[11]Jang J,Lee K B.Transmit power adaptation for multiuser OFDM systems[J].IEEE Journal on Selected Areas in Communications,2003,21(2):171-178.
[12]汪照,李有明,陈斌,等.基于鱼群算法的OFDMA自适应资源分配[J].物理学报,2013,62(12):509-515.Wang Zhao,Li You-ming,Chen Bin,et al.OFDMA adaptive resource allocation based on fish swarm algorithm[J].Acta Physica Sinica,2013,62(12):509-515.
[13]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.
[14]Sharma N,Madhukumar A S.Genetic algorithm aided proportional fair resource allocation in multicast OFDM systems[J].IEEE Transactions on Broadcasting,2015,61(1):16-29.
[15]Chen S,Ren Z,Hu B,et al.Resource allocation in downlink OFDM wireless systems with user rate allowed regions[J].Wireless Personal Communications,2015,80(1):429-445.