重庆邮电大学学报（自然科学版）2017，Vol.29Issue(6)：732-738,7.DOI:10.3979/j.issn.1673-825X.2017.06.004
一种改进的电力线通信OFDM自适应比特分配算法
An improved bit allocation algorithm for PLC-OFDM system
摘要
Abstract
To adapt to frequency selective fading of low-voltage power line,a new low-complexity adaptive bit loading algorithm is proposed under the total power and peak power constraints.Firstly,the subcarriers are grouped to reduce the computational complexity,the subcarriers in the group will use the same modulation scheme.And then the water-filling algorithm is used to solve the related continuous-input rate maximization problem,the rounding bit vector is used as the initial bit allocation vector of the greedy algorithm,this paper theoretically proves the validity of the bit vector.Finally,according to the initial vector,greedy-based bit-adding operations or greedy-based bit-removing operations are exploited on each subcarrier.The simulation results show that the optimized throughput,starting from the initial bit vector,is achieved by adding or removing bits on each subcarrier at most once.Compared with many algorithms in the literature,the proposed algorithm can guarantee the achievable throughput with significant reduction of computation cost under the different numbers of subcarriers and different total power constraints.关键词
电力线通信(PLC)/峰值功率/比特分配/低复杂度算法Key words
power line communication(PLC)/peak power/bit loading/low-complexity algorithm分类
信息技术与安全科学引用本文复制引用
申敏,吴素园,李玲欣..一种改进的电力线通信OFDM自适应比特分配算法[J].重庆邮电大学学报（自然科学版）,2017,29(6):732-738,7.基金项目
国家科技重大专项基金资助项目(2016ZX03002010-003)The National Science and Technology Major Project of China(2016ZX03002010-003) （2016ZX03002010-003）
