摘要
针对低压电力线误码率高、可靠性不强的特点,提出了一种高效的扩频通信方法,即LDPC-OWDM通信方法。在LDPC-OWDM通信系统中,用小波变换代替FFT变换可以省去循环前缀,从而提高带宽利用率。传输的信号首先采用LDPC编码,然后通过基带调制,再经过小波逆变换,最后通过射频电路发射出去;接收端采用相反的过程。文章首先描述了系统理论,然后对其性能进行仿真分析。结果表明,LDPC-OWDM系统的性能明显优于LDPC-OFDM系统。
In view of the high error rate and low reliability of low-vohage power line, LDPC-OWDM, an efficient spread spectrum communication method, is proposed. In this method, the wavelet transform is used to replace FFT in order to eliminate the cyclic prefix and remarkably improve the bandwidth utilization. The transported signals are encoded by LDPC code, modulated by adopting base band, transformed by wavelet, and then transmitted by radio-frequency circuit. An opposite process is taken at receiver side. In the paper, the system theory is introduced, and simulation and analysis about its performance are discussed. The results show that the performance of LDPC-OWDM proposed in this paper is better than that in LDPC-OFDM system.
出处
《电力系统通信》
2009年第10期36-39,共4页
Telecommunications for Electric Power System
