摘要
针对电力线载波通信信道衰减比较严重,具有时变性,在突发通信模式下的正交频分复用(OFDM)系统中信号发送不连续的问题,提出一种适用于基于OFDM技术的电力线载波通信系统使用的自动增益控制(AGC)方案。本方案先进行同步检测,再进行AGC控制,利用前导序列一个符号的能量大小进行增益系数的控制。将本方案应用于G3电力线载波协议(G3-PLC)系统中,并在FPGA上进行实现。仿真和实现效果表明,本文提出的方案结构简单,收敛速度快,运行可靠。
An adaptive Automatic Gain Control (AGC) strategy is proposed because of the great channel attenuation of Low Power Line Communication and the transmition of signal being discrete in burst-mode OFDM system. In this strategy, after synchronous detection, the increasing coefficient is controlled by the energy of one symbol in preamble. At last, this strategy is applied to the G3-PLC system, implemented in FPGA. The simulation suggests that the proposed strategy has simple structure, high Convergence speed and stable operation.
出处
《世界科技研究与发展》
CSCD
2013年第6期720-722,共3页
World Sci-Tech R&D
关键词
正交频分复用
电力线载波通信
G3电力线载波通信协议
自动增益控制
现场可编程门阵列
orthogonal frequency division multiplexing ( OFDM )
power line communication ( PLC )
G3-PLC
automatic gain control (AGC)
field programmable gate array(FPGA)