CAJ | 학술논문

电力线载波通信（ PLC）系统中，由于信道的复杂性，信道频谱利用率一般很低。为了提高频谱利用率，目前常见的方法是通过正交频分复用（ OFDM）的多载波技术与高阶调制码型，如南奎斯特系统、超南奎斯特（ Fas-ter-than-Nyquist，FTN）系统[1-2]。由于频谱被压缩，时钟信息在频谱上的分量减少或是消失，导致传统的时钟恢复技术失败。由此提出了时钟恢复新技术，可以解决该问题。即使发射端的脉冲形成滤波器滚降系数趋近或逼近零时，也可以稳定地恢复接收码元中的时钟。通过仿真得出，改进的Gardner算法不仅可以用到传统的单载波系统，也可以用到这种频谱压缩后的系统。
전력선재파통신（ PLC）계통중，유우신도적복잡성，신도빈보이용솔일반흔저。위료제고빈보이용솔，목전상견적방법시통과정교빈분복용（ OFDM）적다재파기술여고계조제마형，여남규사특계통、초남규사특（ Fas-ter-than-Nyquist，FTN）계통[1-2]。유우빈보피압축，시종신식재빈보상적분량감소혹시소실，도치전통적시종회복기술실패。유차제출료시종회복신기술，가이해결해문제。즉사발사단적맥충형성려파기곤강계수추근혹핍근령시，야가이은정지회복접수마원중적시종。통과방진득출，개진적Gardner산법불부가이용도전통적단재파계통，야가이용도저충빈보압축후적계통。
Due to the complexity of the information channel ,its spectrum utilization ratio is usually low in the power-line carrier communication system .In order to increase the ratio ,the OFDM multi-carrier technology and high-order modulated code-pattern systems such as the Nyquist system and the FTN system are commonly applied .The spec-trum components of the clock information will reduce or vanish because of the spectrum compression , which will make the traditional clock recovery technology lose its efficacy .The new technology presented in this essay will solve the problem .Even if the roll-off factor of the pulse-shaping filter of the transmitting terminal approaches zero or al-most reaches zero ,the new technology can still stably recover the reception the clock in the code element .Relevant simulations show that the improved Gardner algorithm can be applied in both the traditional single -carrier system and the spectrum-compressed system .