(1) electronic circuits, this direction can be said to be the most difficult, and our department has the least graduate students in this direction. The most popular in this direction is IC design. As China has not been able to independently develop integrated circuits, the hope of the motherland is pinned on them. I started with circuit design, but its complicated calculations and experiments frightened me. Circuit design is a technology that emphasizes "experience". If you are experienced, you can quickly know the parameter selection of a current limiting resistor, a current loop and a capacitor, otherwise it will take at least three or four times more time if it is slow. At that time, I made a high-frequency filter with only five capacitors and five inductors, so I designed it for three months! Either the insertion loss is wrong or the q value is wrong. When drawing a circuit board, even if the position of a component is not well designed, parallel is not parallel, vertical is not vertical, the result is a mess, even if you are perfect in software simulation. So for some impatient students, electronic circuits are not a good direction.
(2) Communication, which can be said to be a hot major. From the previous broadcast to the current mobile communication, its fans have been increasing. However, communication is also a complex subject, which has an indissoluble bond with mathematics since its birth. Lengthy differential equations, formulas of a bunch of variables, complicated calculations, and great differences between the laboratory environment and the real environment. Obviously, a communication circuit can send and receive correctly in the laboratory, but once it leaves the main road, it can't receive anything, or the car drives too fast, and the demodulation will be chaotic. Moreover, it has always been a mystery whether high-frequency radiation has an impact on the human body. Some tutors engaged in microwave communication and smart antennas often let his graduate students eat more laver and seaweed to absorb radiation. I was also working on a CDMA 1x wireless Internet project. Later, due to the monopoly of the communication market, my idea in this direction was extinguished.
(3) Signal processing, that is, the direction I am engaged in as a graduate student and now. Signal processing is a big family, which is biased towards software and closely related to computers. Learning the direction of signal processing requires dealing with various protocols, standards, suggestions, white papers and organizations (telecom students such as IEEE and CCITT should be familiar with them). Once you design something that doesn't meet the standard, it's tantamount to garbage. Signal processing is very extensive, such as circuit control, bus control (I2C bus, CANBUS bus), embedded system (PLD, DSP, single chip microcomputer and even embedded Pentium 166MMX), multimedia technology (image processing, image recognition, voice signal processing, video compression, streaming media, codec) and so on. Many times, it is boring to write programs on the computer, but you don't have to run around. Collect data, etc. And without any experience, it's easy to get started. Although sometimes you have to touch the circuit, most of them just give the interface or understand the format of the input and output signals. More suitable for some "lazy" people. It is enough to write embedded assembly and C language, and there is no need to study data structure and software engineering in depth (of course, knowing something will speed up development). Those who engage in multimedia technology must understand more advanced languages, but the most important thing is algorithms. International standards and protocols are the most optimized and safest algorithms at present, so don't start a new stove by yourself.
Therefore, telecommunication technology is a promising subject. Don't despise any courses at will, and don't engage in any unorthodox activities. Do one thing and love another. Since I chose her, I have to finish what I started, hehe.
Source: bbs.gznet.edu.cn South China Kapok Forum. Forward the letter. ※