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针对多用户正交频分复用(Orthogonal Frequency Division Multiplexing,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(Artificial Bee Colony,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,本文提出的算法不仅兼顾了用户的公平性,同时也有效地提高了系统的吞吐量,从而证明本文算法的有效性。
Aiming at the problem of user fairness and system capacity in adaptive resource allocation of multi-user Orthogonal Frequency Division Multiplexing (Orthogonal Frequency Division Multiplexing), a scheme of combining subcarrier allocation and power allocation is proposed in this paper. In subcarrier allocation, the number of subcarriers required by each user is determined first, and then the subcarriers are allocated according to the user’s rate ratio, and finally the remaining subcarriers are allocated. In power allocation, the global search through Artificial Bee Colony (ABC) algorithm realizes the power optimization among all the users and uses the equal power allocation manner to perform single user power allocation for each user’s subcarriers . From the simulation results, we can see that the proposed algorithm not only takes into account the user’s fairness, but also effectively improve the system throughput, which proves the effectiveness of the proposed algorithm.