一种适用于QAM-OFDM自适应分配算法  

An adaptive bit allocation algorithm for QAM-OFDM

作　　者：刘策伦[1] 罗靖杰 王芳 LIU Ce-lun;LUO Jing-jie;WANG Fang(School of information and electronics,Beijing Institute of Technology,Beijing 100081,China)

机构地区：[1]北京理工大学信息与电子学院,北京100088

出　　处：《微电子学与计算机》2021年第3期61-65,71,共6页Microelectronics & Computer

摘　　要：为解决在正交幅度调制-正交频分复用调制(QAM-OFDM)系统中的自适应比特分配算法复杂度过高的问题,提出了一种子载波比特分配方案.基于边缘自适应准则,通过对信道增益的预处理,在迭代分配中利用与运算以及移位操作来减少贪婪(greedy)算法中的计算和搜寻操作.仿真结果显示:在相同的仿真环境下,改进算法与贪婪算法有着几乎相同的比特分配效果以及误比特率性能,并且较贪婪算法所用的时间更少,由此验证了改进算法具有很高的实用性.In order to solve the problem of excessive complexity of the adaptive bit allocation algorithm in the orthogonal amplitude modulation-orthogonal frequency division multiplexing modulation(QAM-OFDM)system,an adaptive bit allocation algorithm is proposed.Based on the edge adaptation criterion,with the preprocessing of the channel gain,the iterative allocation uses AND operations and shift operations to reduce the calculation and sorting operations in the greedy algorithm.In the same simulation environment,the simulation results show that the improved algorithm has almost the same bit allocation effect as the greedy algorithm,and it takes less time than the greedy algorithm,thus verifying that the improved algorithm has high practicability.

关 键 词：正交频分复用 自适应调制 比特分配 正交幅度调制 

分 类 号：TN802[电子电信—信息与通信工程]