基于COFDM的高速电力载波通信及其SystemView仿真

COFDM-based high-speed carrier communication on power line and its simulation with SystemView

传统电力线载波机已经越来越不能满足实际的需要,而基于编码正交频分复用(COFDM)调制技术的载波机可实现高速数据通信。介绍了COFDM技术的核心调制正交频分复用技术(OFDM),其基本原理是将编码后的串行数据转换为并行数据,采用频率上等间隔的N个载波分别调制,调制后的N个子载波信号相加后同时发送。信号编码采用外码RS(Reed-Solomon),内码为TCM(TrellisCodedModulation)的级联纠错编码。采用SystemView仿真软件对电力线信道模型的误码率性能作了仿真,结果表明电力线载波系统COFDM调制技术是可行的,能实现良好的通信。

The traditional carrier wave transmitter does not meet practical demands,while the COFDM（Coded Orthogonal Frequency Division Multiplexing） modulation technique helps to realize high-speed data communication. OFDM,as its core,transforms serial coding data into parallel data and modulates them respectively by N carrier waves with same frequency intervals. The modulated N child carrier waves are then superposed together and transmitted simultaneously. The cascade correcting code of outer RS（Reed- Solomon） code concatenated with inner TCM （Trellis Coded Modulation） code is adopted for signal coding. The performance of error rate over power line channel is simulated with SystemView,and results testify that the power line carrier system based on the technique of COFDM is feasible to achieve excellent communication.