| 一种高效的OFDM比特功率分配算法 |
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| 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):1379-1382. |
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| 作者姓名： | 黄新林 王钢 马永奎 张成文 姜浩 |
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| 作者单位： | 哈尔滨工业大学,哈尔滨工业大学 通信技术研究所,哈尔滨工业大学通信技术研究所,哈尔滨工业大学通信技术研究所,哈尔滨工业大学 |
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| 基金项目： | 国家重点基础研究发展计划(973计划) |
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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.
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| 关 键 词： | OFDM 比特功率分配 Hughes-Hartogs算法 计算复杂度 |
| 收稿时间： | 7/9/2009 12:00:00 AM |
An efficient bit loading algorithm for OFDM system |
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| HUANG Xin-lin,WANG Gang,MA Yong-kui,ZHANG Cheng-wen and JIANG Hao.An efficient bit loading algorithm for OFDM system[J].Journal of Harbin Institute of Technology,2010,42(9):1379-1382. |
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| Authors: | HUANG Xin-lin WANG Gang MA Yong-kui ZHANG Cheng-wen and JIANG Hao |
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| Affiliation: | Communication Research Center,Harbin Institute of Technology,Harbin 150001,China;Communication Research Center,Harbin Institute of Technology,Harbin 150001,China;Communication Research Center,Harbin Institute of Technology,Harbin 150001,China;Communication Research Center,Harbin Institute of Technology,Harbin 150001,China;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), 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. |
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| Keywords: | OFDM bit loading Hughes-Hartogs algorithm computational complexity |
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