一种裕量最大的高速载波比特功率分配算法

A Bit and Power Allocation Algorithm Based on Max Margin for High Speed Carrier

摘要:

在国家电网公司Q/GDW 1379.4-2013技术规范对智能电能表载波通信单元功率消耗的限定要求下,为保障低压远程电力集抄台区本地通信链路的传输速率稳定可靠,给智能用电实时交互平台提供带宽支持,提出了一种裕量最大的高速载波比特功率分配算法。该算法以兼并窄带载波和宽带载波优势的G3-PLC技术为应用对象,使用约束注水法限定各子载波的传输比特数,根据时变的电力信道增益自适应调整比特功率分配方案,并响应通信服务质量QoS对系统误码率和目标传输速率的要求,结合信噪比门限算法对约束注水法进行界定和优化,得到了功率裕量最大化的表达式。仿真结果表明：提出的算法优于低反馈开销算法,能够适应低压电力线信道。在系统目标传输速率为200kbps时,达到了最大裕量值20,极大程度地降低了通信单元调制解调芯片实际的功率消耗。

Abstract:

In order to guarantee the transmission rate of local area communication link is stable and reliable in low voltage remote power meters-reading region under the demand of limitation for smart meter communication unit power consumption in Q/GDW 1379.4-2013 technical specification, a bit and power allocation algorithm based on max margin for high speed carrier is proposed. This algorithm takes the G3-PLC that combines the advantages of narrow-band carrier and broadband carrier as the application object. Bound water injection algorithm is utilized to restrict the transmission bit number on every sub-carrier and adjustment bit and power allocation scheme adaptive according to the time-varying power-line channel gain. Meanwhile, to response the demand of system BER and target transmission rate, the SNR threshold algorithm is used to define and optimize the bound water injection algorithm. Thus , the expression of the max power margin is obtained. Simulation results show that the algorithm proposed can adapt itself to the low-voltage power line channel is better in performance than that of the low feedback overhead algorithm. The max margin will reach 20 when system target transmission rate comes to be 200kbps and this will reduce the actual power consumption of the modulation and demodulation chip on the communication unit to a great extent.