摘要
正交频分复用技术(orthogonal frequency division multiplex,OFDM)能够有效的消除电力线信道中的频率选择性干扰、脉冲噪声干扰以及多径时延等不良影响,已成为现有电力线通信系统(power line communication,PLC)物理层调制编码的主要技术手段。但OFDM技术仍存在因添加循环前缀(cyclic prefix,CP)导致的频谱利用率受限、高峰值功率比、严格正交性约束下的同步解调等问题。研究了一种广义频分复用技术(GFDM,generalized frequency division multiplex)在电力线通信中的低复杂度模型及其应用方案,采用非矩形脉冲成型滤波器组,降低了带外频谱泄露,通过数据帧中使用更少的CP,提高了频谱利用率。仿真结果表明,在正交性与同步解调要求较低的情况下,基于GFDM的PLC系统错误率(symbol error rate,SER)性能与正交的OFDM系统性能十分接近,且其带外功率泄露明显降低。
Orthogonal frequency division multiplexing（OFDM） can effectively eliminate the frequency selective interference of power line channel,impulse noise interference and multipath time delay effects,it has been the existing main technique of physical layer modulation coding in power line communication.But the OFDM system still exists some problems,such as the limited spectrum efficiency which caused by adding cyclic prefix（CP）,high peak power ratio,synchronous demodulation,and orthogonality,etc.A scheme was proposed on the power line communication physical layer by using the technology of generalized frequency division multiplexing（GFDM）.It uses a non-rectangular pulse shaping filter bank,which can reduce leakage of the spectrum.The spectrum efficiency is improved by using fewer CP in data frames.The simulation results show that the performance of PLC system＇s bit error rate（BER） which based on GFDM could approach to that of the OFDM system,and the outband power leakage in GFDM system is decreased obviously.
出处
《科学技术与工程》
北大核心
2016年第27期188-193,共6页
Science Technology and Engineering
基金
国家自然科学基金项目(61571315
61440027)
广西壮族自治区无线宽带通信与信号处理重点实验室开放基金资助项目(GXKL0614203)资助
