qam modulation

The origin of all radio modulation techniques stem back to the AM and FM basic modulation. AM modulation changes the carrier frequency according to the data signal while the FM changes the carrier frequency accord ing to the data signal. The information signal varies with time such as it could increase, decrease, or vanish to zero. The following signal represents

With the rapid development of the Internet, communication technology is experiencing a huge revolution, because the number of users accessing the network rapidly increases. As a network connected to the end users in the communication network, the access network has become a hot topic in network technology. Currently, the main access technologies include hybrid fiber/coaxial (HFCs) access technology, optical fiber access technology, copper wire access technology and wireless access technology. Co

Reprinted: What is PWM (Pulse Width Modulation): http://www.shenmeshi.com/Science/Science_20070315160722.html PWM (Pulse Width Modulation)-pulse width modulation (PWM) is an on/off type regulated power supply application. It is a very effective technology that uses the digital output of a microprocessor to control analog circuits. With the development of electro

How to disable Dynamic Frequency Modulation of CPU 1. how can I check whether the dynamic frequency modulation function www.2cto.com is enabled on the current OS and whether the clock speed of all cores is the maximum CPU speed: grep-E '^ model name | ^ cpu MHz'/proc/cpuinfo can also be used through: lsmod | grep cpufreq_ondemand to check whether the cpufreq_ondemand module is loaded or through: service --

First, FM modulation 1, the code is as follows:CLC,CLEAR;FM= -; %modulation signal frequency (Hz) Am=0.5; %modulation signal Amplitude FC= 5e3; %Carrier Frequency (Hz) Ac=1; %Carrier amplitude MF=5; %FM Index%%%FIRSTLYKF= MF *2* PI * FM/AMDIATF= KF *AmB=2* (MF +1) *FM%%%SECONDLYFS= 64e3; %Sample Rate N= the; %number of sample points T= (0: N-1)'/fs;% time T%plott

Tags: style blog http io color ar os for SPI. QPSKorthogonal Phase shift keying (quadrature Phase Shift keying) is referred to as "QPSK" and is a digital modulation method. It is divided into two kinds: absolute phase shift and relative phase shift. Because of the phase ambiguity problem in the absolute phase shift, the relative shift phase is used to dqpsk the method. It has been widely used in wireless communication and has become a very important

I. GMSK modulation signal generation, software radio DSP implementation processTwo. Gmsk demodulation, one-bit differential demodulation, DSP implementation processThree. Based on the software radio architecture idea, has been implemented and optimized DSP, in line with the projectFour. ReferencesThe DSP realization of GSM communication system Gmsk"Gmsk modulation and demodulation and its TMS320C6XXXDSP rea

How to disable dynamic frequency modulation of CPU 1. how to check whether the current OS enables the dynamic frequency modulation function www.2cto.com to execute in shell, check whether the clock speed of all cores is the maximum CPU clock speed: grep-E amp; #39; ^ modelname | ^ cpuMHz amp; #39;/proc/c... how to disable dynamic frequency modulation of CPU 1.

The baseband signal is the original electrical signal, which generally refers to the basic signal waveform. In digital communication modulation technology, it refers to the corresponding electrical pulse. In Wireless telemetry and remote control systems and radio technology, modulation is to use baseband signals to control parameters (amplitude, frequency, and phase) of high-frequency carriers so that these