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 ?
After decision polarization, QAM modulation is applied on the signal which is fed back to the transmitter.
For example, let us consider [X.sup.sl] is the frequency domain QAM symbols loaded on subcarriers at lth stratum where l [not equal to] 1 (the superscripts sl stand for stratum -l or lth stratum).
For ideal transmitted symbols having constellation projections [mathematical expression not reproducible] such as those shown in Figure 3(a), the kth received QAM symbol in burst [S.sub.Rx](t) of (3) is denoted as [S.sub.k] for [t.sub.k] < t < [t.sub.k] + [T.sub.Sym] where [t.sub.k is the symbol start time, [T.sub.Sym] is the symbol duration, and k = 1, 2, ..., [N.sub.Sym] where [N.sub.Sym] is the total number of symbols in a received burst.
En la Figura 4 se muestra la constelacion de una modulacion 32 QAM para valores [E.sub.b]/[N.sub.0] de 7, 15 y 25 dB respectivamente, donde claramente se aprecia la degradacion de la constelacion para valores bajos de [E.sub.b]/[N.sub.0].
QAM believes parental guidance and involvement is critical to a child's development, and has a significant impact on a student's academic and social achievement.
To reach an equivalent data rate with an OFDM/QAM system without CP, the FBMC symbols are overlapped with half of the QAM data period staggered time offset, which is called as offset QAM scheme.
Communication environment consists of QAM signals transmitted through a flat fading Rayleigh environment.
The number of cycles of one OFDM symbol was different from the others due to QAM modulation and demodulation implementation.
The APEX3000 is an ultra-dense, fully redundant, state-of-the-art chassis-based edge QAM platform.
Capturing up to 1.2 Gigahertz (GHz) of cable spectrum, the MxL278 DOCSIS 3.1 receiver enables cable operators to meet consumer demand through flexible deployment of downstream bandwidth between OFDM and legacy QAM services.
After interleaving, the binary values are converted into QAM values.
Previous studies mainly referred to HOM as QAM with square constellation (16-QAM or 64-QAM) and Gray allocation.