| 引用本文: | 黄新林,王钢,马永奎,张成文,姜浩.一种高效的OFDM比特功率分配算法[J].哈尔滨工业大学学报,2010,42(9):1379.DOI:10.11918/j.issn.0367-6234.2010.09.007 |
| HUANG Xin-lin,WANG Gang,MA Yong-kui,ZHANG Cheng-wen,JIANG Hao.An efficient bit loading algorithm for OFDM system[J].Journal of Harbin Institute of Technology,2010,42(9):1379.DOI:10.11918/j.issn.0367-6234.2010.09.007 |
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| 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. |
| 关键词: OFDM 比特功率分配 Hughes-Hartogs算法 计算复杂度 |
| DOI：10.11918/j.issn.0367-6234.2010.09.007 |
| 分类号:TN919.3 |
| 基金项目: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) |
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| An efficient bit loading algorithm for OFDM system |
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HUANG Xin-lin1, WANG Gang1, MA Yong-kui1, ZHANG Cheng-wen1, JIANG Hao2
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1.Communication Research Center,Harbin Institute of Technology,Harbin 150001,China;2.School of Electronics Information Engineering,Harbin Institute of Technology,Harbin 150001,China
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| Abstract: |
| 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 802.11a,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,but 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. |
| Key words: OFDM bit loading Hughes-Hartogs algorithm computational complexity |
