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Demodulation is the process of extracting the original information-bearing signal from a carrier wave. A demodulator is an electronic circuit (or computer program in a software-defined radio) that is used to recover the information content from the modulated carrier wave. [1] There are many types of modulation, and there are many types of ...
Amplitude modulation (AM) is a modulation technique used in electronic communication, most commonly for transmitting messages with a radio wave.In amplitude modulation, the amplitude (signal strength) of the wave is varied in proportion to that of the message signal, such as an audio signal.
In the DSB-SC modulation, unlike in AM, the wave carrier is not transmitted; thus, much of the power is distributed between the side bands, which implies an increase of the cover in DSB-SC, compared to AM, for the same power use. DSB-SC transmission is a special case of double-sideband reduced carrier transmission. It is used for radio data systems
In the case of AM, φ(t) (the phase component of the signal) is constant and can be ignored. In AM, the carrier frequency is also constant. Thus, all the information in the AM signal is in R(t). R(t) is called the envelope of the signal. Hence an AM signal is given by the function
In other cases, it may be desirable to maintain some degree of compatibility with simple AM receivers, while still reducing the signal's bandwidth. This can be accomplished by transmitting single-sideband with a normal or slightly reduced carrier. This mode is called compatible (or full-carrier) SSB or amplitude modulation equivalent (AME). In ...
The FM modulation and demodulation process is identical in stereo and monaural processes. FM is commonly used at VHF radio frequencies for high-fidelity broadcasts of music and speech . In broadcast services, where audio fidelity is important, wideband FM is generally used.
commercial and free editions Yes No Partial Yes Yes Automatic or Manual FEM: General purpose for research, engineering and educational use, includes AC, DC and Transient Magnetics, Electrostatics, AC and DC Conduction, Transient Electrics, Heat Transfer and multiphysics COMSOL Multiphysics: commercial Yes Yes Yes Yes Yes Automatic
A tutorial on the significance of Cyclic Prefix (CP) in OFDM Systems Archived 2023-10-05 at the Wayback Machine. Siemens demos 360 Mbit/s wireless; An Introduction to Orthogonal Frequency-Division Multiplex Technology; Short Introduction to OFDM – Tutorial written by Prof. Debbah, head of the Alcatel-Lucent Chair on flexible radio.