Specialty English for Communication Engineering 通信工程专业英语

Course Background

1. Target
   1.1 Communication Knowledge Popularizaiton
   1.2 Communication English Vocabulary
   1.3 Writing on Technological Papers
2. Standards of Grading
   2.1 40% Daily Course Performance
   2.2 60% Closed-style Final Quiz

Unit 1 Brief Introduction of Modern Communication

1. Modern communication means a technology using light wave and electromagnetic wave to transmit or exchange information from one place to another rapidly and accurately, so it’s also called telecommunication technique.
   
2. Along with the unceasing development and fusion of communication technique, computer technique and control technology, performance of communication systems have enormouly expanded, such as visible text, electronic mail-box, video telephone and conference, etc., accompanied with the communicating content extension from simplex voice (audio) and text signals to multimedia information including sound, text, data, picture, video and so on.
3. Not only efficient information transmission, but also information collecting, processing, storage and displaying are carried out by modern communication network.
   3.1 Collecting: ADC: analog to digital converter
   
4. Classification of modern communication systems is different along with the different classifying manners.
   4.1. According to the information direction transmitted in channel, modern communication systems can be divided into the simplex communication systems, half-duplex communication systems, and full-duplex communication systems;
   4.2. According to the number of information communicating approaches, modern communication systems and the parallel communication systems;
   
   4.3. According to the control methods of information transmitted in channels, modern communication systems can be divided into the synchronous communication systems and the asynchronous communication systems;
   
   4.4. According to the line connecting modes and signal interacting ways between signal source and destination, modern communication systems can be divided into point-to-point communication systems, point-to-multi-points communication systems (radio broadcast), multi-points-to-multi-points communication systems (MIMO technology).

Glossary
Morse code 莫斯电码
distortion 失真
Theorem Nyquist 奈奎斯特定理
manifold 多样的
panacea 万能药
cellular network 蜂窝网络, 如GSM/3G
base station 基站
latency 延迟
proliferation 激增
exhaustive 详尽的
killer application 杀手级应用
evolution 进化
heterogeneous 异构的
underlie 构成…的基础
encompass /ɪnˈkʌmpəs/ 包含，包括

Unit 2 Modulation

2.1.1 Digital communication and analog communication
Modern communication can be divided into analog communication and digital communication according to the type of transmitted signal. If signals transmitted in a communication system are analog signals, the communication system is an analog communication system. on the other hand, a digital communication system is a system which transmits and processes digital signals.

band-pass filter: 带通滤波器
passable: 过得去的
carrier: 载波
QAM: Quadrature Amplitude Modulation
ASK: Amplitude Shift Keying
Huffman Coding: 哈夫曼编码（数据压缩算法）
fidelity: 忠贞
reciprocal: 倒数

Unlike analog signal, digital signal is a kind of signal which is discrete in time and has limited number for its amplitude. The most widely encountered digital signal is the one which has only two amplitudes ---- the 0 and 1, and is usually called binary signal show in fig. 2-1(b). Generally, digital signals can be described as binary and M-ary (M>2) signals, clearly, the M-ary signal means a type of digital signal which has M amplitudes for selection. Figure 2-1 illustrates a 4-ary digital signal with 0,1,2,3 amplitudes to choose.

Shannon Theory 香农理论
C = B log₂（1+$\frac{S}{N}$）
C: channel capacity B: bandwidth S/N: Signal to Noise Ratio (generally denoted as SNR in dB)

A general rule of thumb is that an antenna size of ½ or ¼ wavelength will produce good results. Use the formula: Antenna Length = (Speed of Light / Frequency) / 4

from bilibili 絜矩brvc3