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← TechnologyWhich mechanism limits the usable bandwidth during quadrature amplitude modulation (QAM) demodulation processing?
A)Symbol interference from channel dispersion✓
B)Thermal noise within receive amplifiers
C)Phase noise in the local oscillator
D)Quantization error from ADC resolution
💡 Explanation
Symbol interference arises because channel dispersion causes signal spreading, leading to overlap between symbols during demodulation, therefore limiting bandwidth; rather than noise or oscillator instability which also degrade demodulation, symbol interference is amplified in the processing stage.
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