Quadrature amplitude modulation (QAM) is the name of a family of digital modulation methods and a related family of analog modulation methods widely used in modern telecommunications to transmit information.

2023年9月12日 · Quadrature amplitude modulation (QAM) has played a pivotal role in the industry's ability to scale data speed and capacity with user demand over the last 30 years. In this article we describe QAM using basic mathematics and illustrate how a QAM modulator operates.

2025年1月21日 · QAM调制解调系统的公式推导 对于QAM系统，其实整体流程都是一致的，无非就是 4QAM 是每 2 个bit映射到一个复数， 8QAM 是 3 个bit， 16QAM 是 4 个比特， 以此类推。

QAM (quadrature amplitude modulation) is a method of combining two amplitude modulation (AM) signals into a single channel. This modulation scheme helps double the channel's effective bandwidth. QAM is also used with pulse AM in digital systems, such as wireless communications. How does QAM work? QAM is used to achieve greater spectrum efficiency.

2024年5月16日 · QAM是Quadrature Amplitude Modulation的缩写，中文译名为“正交振幅调制”，其幅度和相位同时变化，属于非恒包络二维调制。 本次设计使用环境为Quartus II与Modelsim Altera，项目设计原理图如下：以上就是今天要讲的内容，本文仅仅简单介绍了如何使用FPGA实现数字QAM调制 ...

QAM is a generalization of PAM to bandpass channels. It uses bandwidth efficiently and linear channel distortions can be corrected by adaptive equalization at the receiver. QAM fits in nicely with a combined coding and modulation scheme called trellis coded modulation (TCM) and a method for selecting transmitted symbols known as shell mapping.

2021年1月5日 · 本文以16QAM与64QAM为例，介绍QAM调制方式及其软解调。 QAM调制一般采用格雷码，其调制过程如下： 以16QAM为例，可将其分为两部分，高两位沿虚轴自下而上对二进制0到3依次进行格雷码转换。

Quadrature amplitude modulation (QAM) is a technique that mixes both amplitude and phase variations in a carrier at the same time. What this technique does is to allow higher data rates within the same bandwidth. See the sidebar on spectral efficiency.

2022年8月17日 · Quadrature Amplitude Modulation (QAM) can be defined as a modulation technique that can be used to combine two amplitude modulated waves into a single channel to increase the channel bandwidth.

Quadrature amplitude modulation (QAM) is modulation techniques that we can utilize in analog modulation concept and digital modulation concept. Depending upon the input signal form we can use it in either analog or digital modulation schemes. In QAM, we can modulate two individual signals and transmitted to the receiver level.