重庆邮电大学学报（自然科学版）2017，Vol.29Issue(2)：202-207,6.DOI:10.3979/j.issn.1673-825X.2017.02.010
OFDM系统中一种改进的低复杂度自适应比特功率分配算法
An improved adaptive bit power allocation algorithm with the low complexity for OFDM system
摘要
Abstract
According to the high complexity defect of orthogonal frequency division multiplexing(OFDM) systems in the adaptive bit power allocation,an improved low complexity adaptive bit power allocation algorithm based on margin adaptive (MA) criterion was proposed.Compared with the Greedy algorithm,the proposed improved algorithm can reduce the calculation amount by means of the pre-allocation and the iterative allocation.The improved algorithm will firstly allocate partial bits according to the channel condition in the pre-allocation and then the times of calculating and comparing the power increment for each subchannel in the Greedy algorithm can be reduced by means of increasing the memory overhead in the iterative allocation,thus the complexity of the algorithm is reduced.Simulation results show that in the same simulation environment,the adaptive allocation results of the proposed algorithm and the Greedy algorithm are almost the same,and the proposed algorithm and the Greedy algorithm have almost the same bit-error performance.However,with the increase of the number of subchannels,compared with the Greedy algorithm,the running time of the proposed algorithm is shorter,and then it shows that the proposed algorithm has a low complexity.关键词
正交频分复用系统/比特功率分配/复杂度/算法Key words
OFDM systems/bit power allocation/complexity/algorithm分类
信息技术与安全科学引用本文复制引用
朱继华,王竟鑫,申茜,邱飘玉,王永,袁建国..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):202-207,6.基金项目
国家自然科学基金(61472464) （61472464）
重庆市基础与前沿研究计划项目(cstc2015jcyjA0554,cstc2013jcyjA40017) （cstc2015jcyjA0554,cstc2013jcyjA40017）
重庆邮电大学(重庆市)研究生科研创新项目(CYS14144) （重庆市）
The National Natural Science Foundation of China(61472464) （61472464）
The Natural Science Foundation of Chongqing Science and Technology Commission(cstc2015jcyjA0554,cstc2013jcyjA40017) （cstc2015jcyjA0554,cstc2013jcyjA40017）
The Program for Postgraduate Science Research and Innovation of Chongqing University of Posts and Telecommunications(Chongqing Municipal Education Commission)(CYS14144) （Chongqing Municipal Education Commission）
