OFDM系统频率选择性信道功率分配方案  

Power Allocation over Frequency Selective Channel in OFDM System

作　　者：翟绍思 

机构地区：[1]邢台市高速公路管理处,河北邢台054001

出　　处：《通信技术》2011年第5期19-20,23,共3页Communications Technology

摘　　要：自适应分配技术根据子信道的瞬时估计值动态地分配传输比特数和发送功率,可以优化正交频分复用(OFDM,Orthogonal Frequency Division Multiplex)系统的整体性能。这里讨论了基于容量优化的自适应比特分配算法,基于误比特率优化的最佳功率分配算法和次佳功率分配算法。仿真结果表明,对不同信道环境下三种算法的特点和性能进行了分析和比较。仿真结果表明,自适应分配技术可以优化系统的容量和误比特率。Based on the instantaneous estimation of sub-channel,adaptive allocation technology dynamically allocates the bits transmitted bits and the transmit power,optimizes the overall performance of OFDM system.This paper describes the two basic principles of adaptive power allocation in the OFDM,and on the basis,the three algorithms are discussed in detail,including adaptive bit allocation algorithm based on the capacity optimization,optimal power allocation algorithm based on the best bit error rate and the suboptimal power distribution algorithm.Through system simulation with Matlab software,the characteristics and performance of the three algorithms in different channels and environments are analyzed and compared.Simulation results show that the adaptive allocation technology could optimize the capacity and bit error rate of the system.

关 键 词：正交频分复用 自适应比特分配 最佳功率分配 次佳功率分配 

分 类 号：TN914.3[电子电信—通信与信息系统]