基于DF-OFDM多中继系统功率分配的梯度算法  

Gradient Algorithm for Power Allocation Based on DF-OFDM Multi-relay System

作　　者：冯冬雷[1] 颜彪[1] 刘松霖[1] 郭定平[1] 蔡赛燕[1] 

机构地区：[1]扬州大学信息工程学院,江苏扬州225127

出　　处：《无线电通信技术》2013年第2期50-51,82,共3页Radio Communications Technology

摘　　要：DF-OFDM技术必将成为现代移动通信的核心技术,但是合理地进行功率分配是必须要解决的问题之一。传统的二分法,大多在精确度和计算量之间很难取舍。在移动通信系统抗信道衰落和提高信道容量方面,协作通信是一种很好的解决方案。针对改进型的多中继DF-OFDM系统,对一种降低计算量的梯度算法进行了简单的介绍与分析,并与二分法进行了比较。仿真结果表明,在功率约束的条件下,梯度法要优于二分法。The DF-OFDM technology will become the core technology of mobile communication, but one of the problems is to realize reasonable power allocation. In traditional bisection algorithm, it is difficult to tradeoff between precision and calculation amount. Cooperative OFDM transmission is an efficient solution to resist wireless channel fading and to increase the channel capacity in the mobile communication systems. For the improved muhi-relay DF-OFDM system,this paper presents gradient algorithm which reduces the calculation amount, and compare it with bisection algorithm. The simulation results show that gradient algorithm is superior to bisection algorithm under the condition of power constraints.

关 键 词：DF—OFDM系统 功率分配 信道容量 二分法 梯度法 

分 类 号：TN929.53[电子电信—通信与信息系统]