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.
出处
《哈尔滨工业大学学报》
EI
CAS
CSCD
北大核心
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)
