摘要
随着高速电力线载波通信(High-speed Power Line carrier Communication,HPLC)技术在电力物联网中的推广和应用,其面临的组网孤岛/孤点、停电事件上报成功率低、单跳通信距离短等问题逐步显现。无线(Radio Frequency,RF)通信能够有效地解决这些问题,从而成为了HPLC的有力补充。对于HPLC&RF双模系统中的无线通信,现有的导频设计没有充分考虑其典型应用信道的时频相关性,为此提出了一种新的导频设计方案。该方案增加了导频的频域密度,以更好地适应频率选择性高的信道;同时基于所有典型信道随时间变化缓慢的特性,降低了导频的时域密度;另外,重新设计了导频的时频位置,以进一步降低信道估计的复杂度。新方案的导频开销为原方案的1/2。仿真结果表明,所提方案的性能均优于原方案,且适用的信道估计方法简单,计算复杂度低,易于实现,能够更好地满足双模系统的推广应用需求。
With the application of high-speed power line carrier communication(HPLC)in the power Internet of Things,some problems are gradually emerging such as network outliers,low success rate of power outage reporting and short single hop communication distance.Radio frequency(RF)communication can solve these problems,thus becoming an effective supplementation to HPLC.For the wireless communication in HPLC&RF dual mode systems,the existing pilot design does not fully consider the time-frequency correlation of the typical channels,so a new pilot design is proposed.The new scheme increases the frequency domain density of pilot to better fit high frequency selectivity channels.At the same time,it reduces the time domain density of pilot based on the fact that all typical channels are changing slowly with time.Additionally,the location of pilot is redesigned to further reduce the complexity of channel estimation.Overhead of the new scheme is reduced by 1/2 compared with that of the original scheme.Simulation results show that performance of the proposed scheme is better than that of the original scheme under 9 typical channels.Moreover,its applicable channel estimation method is simple,computational complexity is low,and it is easy to be implemented.The proposed scheme can better meet the application requirements of dual-mode systems.
作者
张春玲
王丹
赵训威
ZHANG Chunling;WANG Dan;ZHAO Xunwei(Research Institute of State Grid Information&Telecommunication Group Co.,Ltd.,Beijing 100052,China)
出处
《电讯技术》
北大核心
2021年第8期1020-1025,共6页
Telecommunication Engineering
关键词
电力物联网
高速电力线载波通信
双模系统
导频设计
信道估计
power Internet of Things
high-speed power line carrier communication
dual mode system
pilot design
channel estimation
