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OFDM技术是第四代移动通信的核心技术之一,是一种高效的数据传输方式,是一种特殊的多载波传输方案。本文介绍的改进后的自适应调制技术,自适应地根据星座图集所限定的比特数目来进行变步长调整,这样大大减少了计算量。并通过使用Matlab仿真出的结果与Campello算法仿真的结果进行比较,说明改进后的变步长的自适应OFDM算法的优越性。
OFDM is one of the core technologies of the fourth generation of mobile communications. It is an efficient data transmission method and is a special multi-carrier transmission scheme. In this paper, the improved adaptive modulation technique adaptively adjusts the number of bits according to the number of bits defined by the constellation set, thus greatly reducing the amount of computation. The results of simulation using Matlab are compared with the results of Campello simulation, and the superiority of the improved OFDM algorithm with variable step size is demonstrated.