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A coherent detector uses the knowledge of the phase of the carrier wave to demoduleate the signal.
it's simply a product device , which multiply the AM signal by a sinusoidal signal having the same carrier frequency , followed by a low pass filter ( LPF). The product will shift the AM signal to 0 Hz and double carrier frequency , and the LPF will eliminate the later component.
2ANSWER:
Coherent detection
inCoherent detection
requires carrier phase recovery at the receiver and hence, circuits to perform phase estimation.
Sources of carrier-phase mismatch at the receiver:
inPropagationtalking causes carrier-phase offset in the received signal.
inThe oscillators at the receiver which generate the carrier signal, are not usually phased locked to the transmitted carrier.
coherent detection: Huge need for a reference in phase with the received carrier
inLess complexity compared to incoherent detection at the price of higher error rate.
Coherent ( synchronous ) detection: in coherent detection , the local carrier generated at the receiver in phase locked with the carrier at transmitter .
Non coherent ( envelope ) detection : this type of detection does not need receiver carrier to be phase locked with transmitter carrier
Wiki User
∙ 13y ago
Wiki User
∙ 11y agocoherent detection:
when the receiver exploits knowledge of the carrier's phase to detect the signal. the process is called coherent detection.
non-coherent detection:
when the receiver does not utilize such phase reference information. the process is called non-coherent detection.
Madi Lewis
coherent detection the local carrier generated at the receiver is phase locked with. the carrier at the transmitter. Hence it is also called synchronous detection. In non coherent detection the local carrier generated at the receiver not be phase. Locked with the carrier at the transmitter.
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What is the difference between coherent and non coherent precipitaion hardening?
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What is non coherent detection?
Non-coherent detection uses a product detector with a beat frequency oscillator to detect Morse code, CW transmissions or single-side band. It does not need carrier phase information at the receiver.
What is difference between a coherent detector and envelop detector?
What the difference between envelop and coherent detection of AM signals
What is non coherent detector?
A non coherent detector is a type of device that does not need a receiver carrier to be phase locked to a transmitter carrier. A coherent detector demodulates signals.
What is the difference between coherent demodulation and non coherent demodulation?
In case of coherent demodulation carrier used for demodulation purpose is in phase and frequency synchronism with carrier used for modulation purpose. For non-coherent demodulation it is not in synchronism.
What has the author Jason Barry Brent written?
Jason Barry Brent has written: 'Coherent detection of QAM signals in land mobile radio'
where can I find information about class 2 transformer online?
linear receiver. The more difficult case of a nonlinear receiver is deferred to Section 2.12. Consider the case of DSB-SC modulation Figure 2.36 shows the model of a DSB-SC receiver using a coherent detector. The use of coherent detection requires multiplication
Why do you use envelope detection in an M-ary Frequency Shift Keying noncoherent Modulator?
Envelope detection is used in an M-ary Frequency Shift Keying noncoherent modular because LOs are not required. Moreover, an estimate of 1dB of more power compared to the Frequency Shift Keying coherent demodulation.
What has the author John Ralph Ragazzini written?
John Ralph Ragazzini has written: 'The effect of fluctuation voltages on linear detection' -- subject(s): Interference, Radio, Receivers and reception
Is coherent a verb?
No, coherent is an adjective.
Is frequency range of mobile communication is greater than FM?
There is no answer to this question, it needs to be reworded into a coherent form. Most mobile communications use F.M. (analog systems) or some form of digital transmission/reception.
