两跳OFDM译码转发中继系统的功率分配研究  

Power Allocation for Two Hop OFDM-DF Relaying Systems

作　　者：蔡木林[1] 蔡跃明 杨文东 蔡春晓[3] 

机构地区：[1]解放军理工大学通信工程学院研究生3队,江苏南京210007 [2]解放军理工大学通信工程学院无线通信系 [3]解放军理工大学通信工程学院研究生4队

出　　处：《军事通信技术》2010年第2期6-10,共5页Journal of Military Communications Technology

摘　　要：分析了系统总功率约束和各节点独立功率约束条件下的中继信道,提出了以最大化系统容量为准则的两跳中继系统联合子载波配对和功率优化分配算法。算法先进行子载波配对,然后选出一组信道增益最大的子载波进行平均功率分配,最后通过迭代得到功率分配结果。为了进一步降低系统复杂度,我们利用相邻子载波之间的相关性,用若干相邻子载波组成一个等效子信道。仿真结果表明,所提算法可以在大大降低反馈量的情况下达到和注水功率分配几乎相同的系统容量。Relay channel was analyzed under total power constraint and separate power constraint.A joint subcarrier matching and power allocation scheme was proposed to maximize the channel capacity.First,subcarriers were matched,and then the power was uniformly allocated to a group of subcarriers with better channel gains.The above procedure was iterated until convergence was achieved.Several subcarriers were bound to a subchannel according to the frequency domain correlation of neighboring subcarriers to reduce complexity.Simulation results show that the proposed scheme can achieve the same capacity as the waterfilling scheme with lower complexity.

关 键 词：正交频分复用 中继信道 译码转发 功率分配 

分 类 号：TN91[电子电信—通信与信息系统]