一种高效的OFDM比特功率分配算法  

An efficient bit loading algorithm for OFDM system

作　　者：黄新林[1] 王钢[1] 马永奎[1] 张成文[1] 姜浩[2] 

机构地区：[1]哈尔滨工业大学通信技术研究所,哈尔滨150001 [2]哈尔滨工业大学电子与信息工程学院,哈尔滨150001

出　　处：《哈尔滨工业大学学报》2010年第9期1379-1382,共4页Journal of Harbin Institute of Technology

基　　金：装备预研资助项目(51306020201);国家重点基础研究发展计划资助项目(2007CB310601);中国博士后科学基金资助项目(20080440897)

摘　　要：针对802.11a中的数字调制方式:BPSK,QPSK,16QAM,64QAM(星座图采用格雷码编码,每个子载波最多承载6比特),每次对?RT/6」个功率增量较小的子载波分配2bit.仿真结果表明:改进的比特功率分配算法与Hughes-Hartogs算法的比特功率分配结果一致,但是计算复杂度小于Hughes-Hartogs算法的50%,并随着传输速率或子载波数的增加而进一步降低.We propose an efficient bit-loading algorithm to minimize the total power to transmit a target rate of a single user in OFDM communication systems. Considering the digital modulations exploited by 802. 11 a, which are BPSK, QPSK, 16QAM and 64QAM （constellation using Gray code and each sub-carrier carrying a maximum of 6 bits）,[RT/6 ]subcarriers which have litter power addition are allocated with 2 bits each time. The proposed bit loading algorithm is optimal and has the same performance as Hughes-Hartogs algorithm, greatly reduces the computational complexity. Simulation results show that the proposed bit loading algorithm has the same bit allocation results as Hughes-Hartogs algorithm, but the computational complexity is less than 50% compared with that of Hughes-Hartogs algorithm. The computational complexity will be further reduced when the transmission rate or subcarriers number increases.

关 键 词：OFDM 比特功率分配 Hughes—Hartogs算法 计算复杂度 

分 类 号：TN929.5[电子电信—通信与信息系统]