modulation

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modulation

 [mod″u-la´shun]
the normal capacity of cell adaptability to its environment.
antigenic modulation the alteration of antigenic determinants in a living cell surface membrane following interaction with antibody.

mod·u·la·tion

(mod'yū-lā'shŭn),
1. The functional and morphologic fluctuation of cells in response to changing environmental conditions.
2. Systematic variation in a characteristic (for example, frequency, amplitude) of a sustained oscillation to code additional information.
3. A change in the kinetics of an enzyme or metabolic pathway.
4. The regulation of the rate of translation of mRNA by a modulating codon.
[L. modulor, to measure off properly]

modulation

The regulation of the rate at which a specific gene is transcribed.

mod·u·la·tion

(mod'yŭ-lā'shŭn)
1. The functional and morphologic fluctuation of cells in response to changing environmental conditions.
2. Systematic variation in a characteristic (e.g., frequency, amplitude) of a sustained oscillation to code additional information.
3. A change in the kinetics of an enzyme or metabolic pathway.
4. The regulation of the rate of translation of mRNA by a modulating codon.
5. Change in parameters of electrotherapy (e.g., frequency, amplitude).
[L. modulor, to measure off properly]
References in periodicals archive ?
Nandi, "Procedure for automatic recognition of analogue and digital modulation," IEE Proceedings Communications, vol.
Ren, "Recognition of digital modulation signals based on high order cumulants and support vector machines," ISECS International Colloquium on Computing, Communication, Control, and Management, 271-274, 2009.
Movahedi, "Automatic digital modulation identification using an intelligent method," ICS 2007.
For the digital modulation test (384 kbps [pi]/4-DQPSK signal with channel spacing 384 kHz), as listed in Table 6, the EVM and ACPR values are approximately 1.8 percent and -45 dBc (at 5 dBm output power) and -4 percent and -32 dBc (at 10 dBm output power), respectively.
"Digital modulation classification using constellation shape", Signal Process., 80(2): 251-277.
In a case of digital modulations, we must ensure encoding digital information into the analog form and back--discern digital data from the analog transmission.
The ZT8101 Test Set comes standard with a wide 150 MHz modulation bandwidth to meet current and future communication protocols including JTRS, WCDMA, LTE, and WiMax; vector signal analysis capability for complex digital modulation analysis including error vector magnitude (EVM) and adjacent channel power measurement; and compatibility features for third-party RF instruments for frequency range extension.
Written for practicing engineers and senior undergraduates in digital communications, this thorough text on the mathematical theory of modem design introduces the theory of digital modulation and coding that is the foundation for the design of digital communications systems.
Anritsu has designed Signature in an open Windows XP environment so it can facilitate the exchange of simulated and measured data necessary to accurately analyze today's complex digital modulation. Users can readily design new or proprietary digital modulations by adding the MATLAB Connectivity Option.
Moving to an example from the digital modulation world, the benefits of multi-domain analysis can be further explored.
"Performance analysis and Monitoring of various Advanced Digital Modulation and Multiplexing techniques of f.o.c within and beyond 400 gb/s", International Journal of Computer Networks & Communications (IJCNC), 6-2.

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