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以电力线作为通信介质,能够实现成本低、覆盖面广的语音和数据传输。目前广泛使用的电力线载波机主要有数字化载波机和全数字载波机两种。文中介绍了一种通用型数字式电力线载波机,该载波机基于软件无线电的理念,在通用的硬件平台上,通过加载不同的软件,可分别实现上述两种载波机功能,具有完全可编程、模块化、兼容性强的特点。阐述了该载波机的设计原理、硬件组成,引入了正交调制的概念,并详细介绍了单边带调制和网格编码调制的软件实现方法。
With the power line as the communication medium, voice and data transmission with low cost and wide coverage can be realized. Currently widely used power line carrier mainly digital carrier and full digital carrier two. In this paper, a universal digital power line carrier is introduced. Based on the concept of software radio, the carrier can realize the above two kinds of carrier functions by loading different softwares on a common hardware platform. The carrier can be fully programmable, Modular, compatible with the characteristics. The design principle and hardware constitution of this carrier computer are introduced. The concept of quadrature modulation is introduced. The software implementation of single sideband modulation and trellis code modulation is introduced in detail.