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所在平台: Udemy |
课程主页: https://www.udemy.com/course/rf-circuits-and-systems-basics-of-communication-theory/
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**Coursera课程概要：RF电路与系统 - 通信理论基础** 本课程为RF电路与系统系列课程的第二门，重点讲解通信理论的基础知识，特别是调制与解调的概念。 课程将阐述通信设备传输和接收的信息（基带信号）通常占用从DC到几兆赫兹（数据传输时可达千兆赫兹）的频率范围。为了实现长距离有效通信，通常需要将基带信号通过另一种信号（载波）进行频率上变频。信息可以通过改变载波的幅值、相位或频率来传输。 * **幅度调制 (AM)**：信息改变载波的幅值。 * **相位调制 (PM)**：信息改变载波的相位。 * **频率调制 (FM)**：信息改变载波的频率。 课程还将深入探讨现代通信系统普遍采用的**数字调制**。数字调制能够利用数字信号处理技术，显著提高信号传输的频谱效率。为了更有效地利用频谱传输数据并提高信息速率，信息比特可以被组合成“符号”，每个符号包含多个比特。符号传输允许在特定时间实例发送更多信息比特。符号形成与频率上变频共同构成了数字调制。 具体而言，本课程将学习： * **数字调制技术**：包括幅度键控 (ASK)、相位键控 (PSK)、频率键控 (FSK) 和正交幅度调制 (QAM)。 * **先进技术**：还将讨论广泛使用的先进技术，如正交频分复用 (OFDM)。
The second course in this seven-course series focuses on the fundamentals of communication theory. OF particular importance is the concept of modulation and demodulation. We will learn that the information that is being transmitted and received by a communication device often occupies frequencies from DC to a few megahertz (gigahertz in the case of data). Effective communication over a long distance often requires frequency-upconversion of the information, which is called baseband signal, to high frequency using another signal called carrier. The information can be featuring different attributes of the carrier such as its amplitude, phase, or frequency. Placing the information on the amplitude of the carrier leads to the notion of amplitude modulation (AM). Likewise, in the case that the phase or frequency of the carrier varies by the baseband signal, we will achieve phase modulation (PM) and frequency modulation (FM). Modern communication systems all employ digital modulation. Digital modulation allows the use of digital signal processing techniques to vastly improve spectral efficiency during signal transmission. To more efficiently use the spectrum to transmit data, thus increasing the information rate, the information bits can be formed into "symbols." Each symbol is comprised of several bits. The symbol transmission allows for sending more information bit at specific instances of time. The symbol formation together with frequency upconversion constitutes the digital modulation. In this course, we will learn about different digital modulation techniques including amplitude, phase, and frequency shift keying, and quadrature amplitude modulation (QAM). Widely used advanced techniques such as orthogonal frequency division multiplexing (OFDM) will also be discussed in this course.
