The postgraduate entrance examination for communication engineering majors takes English, mathematics, politics and professional courses. Communication and information systems will be generally investigated, including communication principles, signals and systems. Signal and information processing will generally be examined in signal and system and digital signal processing. The direction of circuit and system generally refers to analog electronic technology and circuit of signal and system. The direction of electromagnetic field and electromagnetic wave generally refers to electromagnetic field and electromagnetic wave antenna microwave and the like. Communication engineering is also called telecommunication engineering, formerly known as long-distance communication engineering and weak current engineering. It is an important branch of electronic engineering, a sub-discipline of electronic information and one of the basic disciplines. This course focuses on the principle and application of information transmission and signal processing in communication. This major studies the knowledge of communication technology, communication system and communication network, and can engage in the research, design, manufacture and operation of communication field, and engage in the development and application of communication technology and equipment in various departments of national economy and national defense industry.