全数字电力线载波机中基带调制的实现  

Implementation of baseband modulation in DPLC

作　　者：惠毅[1] 周志杰[1] 胡祥光[2] 张文强[1] 

机构地区：[1]解放军理工大学通信工程学院,江苏南京210007 [2]南京军区通信网络技术管理中心,江苏南京210016

出　　处：《电力自动化设备》2007年第7期98-101,共4页Electric Power Automation Equipment

摘　　要：全数字电力线载波通信是采用高压电力线进行通信的一种手段,而基带调制对全数字电力线载波机的整机性能有着非常重要的影响。提出了一种全数字电力线载波机中基带调制解调的实现方案。该方案采用基于正交幅度调制(QAM)方式的多维网格编码调制技术实现了联合的编码和调制,提高了系统容量;采用自适应信道均衡技术和非线性预编码技术,降低了系统误码率;采用数字信号处理(DSP)芯片对传统的电力线载波机进行数字化改造,增强了电力线载波通信的性能,减小了电力线载波机的体积。对方案的各个部分进行了详细的阐述,并提出了一种采用Hilbert变换法实现QAM解调的方法,给出了同步算法的软件实现思想。实际应用表明,该方案实现的载波机通信容量大,传输质量高。DPLC（Digital Power Line Carrier） is a communication mean via high voltage power line, and the baseband modulation has important influence on its performance,for which an implementation scheme is presented. The trellis-coded modulation technology with multidimensional constellations based on QAM（Quadrature Amplitude Modulation） is used to increase system capacity,the non-linear precoding technology and the adaptive channel equalization technology are adopted to reduce bit error rate,and the DSP（Digital Signal Processor） is used to enhance the performance and reduce the size of DPLC equipment. All parts of the scheme are presented in detail,and the demodulation scheme for QAM using Hilbert transformation is provided. The synchronization is realized by software. Tests show that the equipment based on this DPLC scheme has high capacity and good performance.

关 键 词：全数字电力线载波通信 非线性预编码 多维网格编码调制 正交幅度调制 VITERBI译码器 自适应信道均衡 

分 类 号：TN913.6[电子电信—通信与信息系统]