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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

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Wiki User

13y ago
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Wiki User

11y ago

coherent 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.

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Madi Lewis

Lvl 3
2y ago

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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