demodulation


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demodulation:

see modulationmodulation,
in communications, process in which some characteristic of a wave (the carrier wave) is made to vary in accordance with an information-bearing signal wave (the modulating wave); demodulation is the process by which the original signal is recovered from the wave
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demodulation

[dē‚mäj·ə′lā·shən]
(communications)
The recovery, from a modulated carrier, of a signal having substantially the same characteristics as the original signal.

demodulation

Electronics the act or process by which an output wave or signal is obtained having the characteristics of the original modulating wave or signal; the reverse of modulation

demodulation

(communications)
To recover the signal from the carrier. For example, in a radio broadcast using amplitude modulation the audio signal is transmitted as the mean amplitude of a radio-frequency carrier so demodulation requires a circuit which measures the amplitude and filters out the carrier. There are many other kinds of modulation and corresponding demodulation.
References in periodicals archive ?
'We are pleased to report another industry-first of 3GPP RF demodulation and RRM test cases,' said Muthu Kumaran, senior director at Keysight Technologies.
Since BPSK symbols are real value, the real part y = Re{[y.sub.D]} can be employed in demodulation. It is a real Gaussian random variable with zero mean and variance [mathematical expression not reproducible].
Figures (6,7) shows the RF spectrum of the OFDM signal at a CP of 1/32, the power of the RF is measured at -10 dBm after the OFDM modulation and at 39dBm after the OFDM demodulation. Figure (8) shows the BER as a function of the fiber launch power per channel after 1000 km transmission for Dual polarization system, which gives the lower BER at input power of 14 dBm means increasing input power leads to decrease the BER.
As the attenuation coefficient [[alpha].sub.j] increases with increasing the magnetic field, the demodulation depths of dips (A) and (D) and peak (C) are strengthened; however, the demodulation depth of dip (B) is weakened.
Hence, we can detect gear fault via frequency demodulation analysis.
Based on the entire sparse graph, the demodulation or decoding can use not only the knowledge of channels, but also parity-check information.
QUADRATURE DEMODULATION OF AM RADIO SIGNAL SUPERIMPOSED WITH HV NOISE
As mentioned before, the demodulation of a single interferogram often involves a combination of methods (GA + Zernike, PSO + Zernike, Neuronal networks + others, etc.).
- Many channel-filtering, demodulation & decoding, triggering, display, and upgrade features
Signal demodulation for AM and FM extends to a time-domain display in addition to audio demodulation.
2) why cannot we obtain the amplitude function a(t) rather than |a(t)| that nearly all the demodulation methods obtain?
To extract the weak information leakage from the amplitude modulation signal, the authors used an incoherent demodulation approach.