OFDMA用户容量最大化的子载波分配优化算法  

Subcarrier-Allocation Optimization in OFDMA Systems based on User-Capacity Maximization

作　　者：刘叶[1] 葛万成[1] 

机构地区：[1]同济大学中德学院,上海200092

出　　处：《通信技术》2017年第8期1638-1641,共4页Communications Technology

摘　　要：对OFDMA系统的资源进行优化,如子载波分配、功率分配等,可显著提高OFDMA系统的性能。现有的几种资源优化算法,由于假定了子载波为等增益条件,与现实中的资源分配条件并不相同,存在一定的缺陷。因此,提出了一种新的基于信道容量最好子载波优先分配(BCCF)算法,即在已知信道状态信息的前提下,通过注水算法计算每个用户对应子载波的信道容量,然后对具有最好信道容量的子载波优先分配。仿真结果表明,所设计的算法对现有算法存在的缺陷有一定补偿,且明显改善了系统总容量。Resources optimization of OFDMA system, involving many aspects such as subcarrier allocation and power allocation, can greatly improve the performance of OFDMA system. Several existing resource optimization algorithms, supposing that these subcarriers are equal-gain conditions and are of no same resource allocation conditions as in reality, usually have certain defects. On account of this, a novel subcarrier allocation algorithm based on optimal channel capacity is proposed, this algorithm, on the premise of known channel state information and with water-injection algorithm, calculates the channel capacity of each user＇s corresponding subcarrier, and then performs preferential allocation to the subcarriers with the best channel capacity. The simulation results indicate that the proposed algorithm could remedy the defects of the existing algorithms and remarkably improve the total capacity of the system.

关 键 词：OFDMA 子载波分配 功率分配 用户容量最大化 

分 类 号：TN91[电子电信—通信与信息系统]