一种新的低压电力线通信比特和功率分配算法  

A Novel Bit and Power Allocation Algorithm for Low Voltage Power-Line Communication

作　　者：周克[1] 邓颖[1] 何威[1] 张霞[1] 张超[1] 

机构地区：[1]贵州大学电气工程学院,贵阳550025

出　　处：《电测与仪表》2014年第10期58-63,共6页Electrical Measurement & Instrumentation

基　　金：贵州省科学技术基金项目(黔科合J字[2013]2125号);贵州省教育厅自然科技基金(2009)0028;贵州大学研究生创新基金(研理工2013002)

摘　　要：为了提高低压电力线通信的传输速率和信道容量,提出了一种新的比特和功率分配算法。利用正交频分复用(OFDM)自适应比特分配方法动态调整了信号的调制方式,在此基础之上分析了电力信道传输信号的误码率。选取电力线多径传输模型作为信道模型,结合注水法和通信服务质量(QoS)提出了基于特定QoS的约束注水法,得出了最大化信道容量的闭式解,分析了影响信道容量的主要因素。仿真结果表明:4QAM调制方式对应的误码率最小。与已有注水法相比,所提功率分配算法的性能最优,当信噪比为40dB时,信道容量可达960Mbps,从而实现了电力信道传输速率的大幅升级。A novel bit and power allocation algorithm has been proposed in this paper to improve the transmission rate and channel capacity for low voltage power - line communication. OFDM adaptive bite allocation method is utilized to adjust the signal modulation mode dynamically. On this basis, the bit error rate （BER） of the transmitting signals in the power channel is analyzed. Power - line muhipath transmission model is selected as the channel model. A specific QoS based constraint water filling method is proposed combining the classical water filling method with the communica- tion QoS, so as to obtain the closed form solution for the maximum channel capacity. Furthermore, the main factors to affect the channel capacity is analyzed deeply. Simulation results show that the BER of 4QAM is the smallest. Compa- ring to the existed water filling methods, the proposed power allocation algorithm will achieve a better performance. When SNR = 40dB, the channel capacity can reach 960Mbps, which has achieved a substantial upgrade for the trans- mission rate of the power channel.

关 键 词：OFDM 误码率 QOS 注水法 信道容量 

分 类 号：TM73[电气工程—电力系统及自动化] TN913.6[电子电信—通信与信息系统]