典型通信频率的低压电力线通信噪声特性研究
Research on the noise characteristics of typical communication frequency in low-voltage power line communication
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摘要: 针对传统选择映射算法需要额外传输边带信息的不足,提出一种预留子载波-选择映射联合算法:通过对正交频分复用OFDM信号的子载波进行分组,将0幅度预留子载波嵌入到各分组的特定位置后对分组进行位移,由此把边带信息嵌入到预留子载波的位置上,最后选择峰均功率比PAPR最优的一路传输.仿真结果表明,该算法不仅不需要额外传输边带信息,同时有效地降低了OFDM系统的PAPR和复杂度,提高了系统频带利用率.Abstract: The low-voltage power line noise acquisition equipment was used to collect noise data in three power environments including the student dormitory,teaching experimentation area and residential area,processing to get 10~500 kHz noise power spectrum was gotten variation tendency of the power line noise amplitude with typical communication frequency and different periods were analyzed.The results showed that:noise amplitude will decrease with the increase of the frequency;Low-frequency noise has a greater impact on the power line;During power peak periods,noise amplitude will fluctuate 10~35 dBμV.Therefore,as far as noise level,the America standard carrier frequency band of 100~450 kHz was more suitable for power line carrier communication than the European standard carrier frequency band of 3~148.5 kHz.
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