一种新型低复杂度的OFDM自适应调制算法  

A Novel and Low-Complexity OFDM Adaptive Modulation Algorithm

作　　者：方四祥 

机构地区：[1]解放军理工大学通信工程学院,江苏南京210007

出　　处：《通信技术》2016年第1期34-38,共5页Communications Technology

摘　　要：OFDM自适应调制最经典的三大算法Hughes-Hartogs算法、chow算法、Ficher算法虽然在信道利用率方面具有无与伦比的优势,但其需要非常大的计算复杂度,对现如今高速通信的要求显然是不符合的;随着对该技术深入的研究有相关学者提出了子带的划分,比如这些算法有SBLA算法、NUDS算法、IDS算法这些技术虽然降低了系统的迭代复杂度,但牺牲了更多的信道容量资源为代价的,利用Ficher算法原理,提出了一种新的子带划分算法,其兼顾了算法的复杂度也能尽可能的逼近不进行子带划分时的信道利用率,通过仿真结果说明了这一点。The three most classic OFDM adaptive modulation algorithms, including Hughes - Hartogs algo- rithm, chow algorithm and Ficher algorithm, although having the incomparable advantages in the channel utilization, requires a very large computational complexity, and this is clearly unconformable to the re- quirement of modern high-speed communications. With the deep research on this technology, some ex- perts propose some division algorithms of the sub bands, such as SBLA algorithm, NUDS algorithm, IDS algorithm, these techniques although could reduce iteration complexity of the system, spend much more channel capacity resources. By using the principle of Ficher algorithm, a new sub-band division algorithm is proposed, which gives attention to both algorithm complexity and possible approximation to the channel utilization without sub-band division. Simulation results clearly verify this point.

关 键 词：OFDM系统 子带划分 信道容量 自适应调制技术 误比特率 

分 类 号：TP393.03[自动化与计算机技术—计算机应用技术]