Pass band implementation of Amplitude shift keying, Frequency Shift Keying, Binary Phase Shift Keying: Generation and Detection

In coherent passband FSK systems, what is the most significant technical challenge that must be addressed in high-mobility wireless environments?
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Why does passband ASK perform poorly in environments with multipath fading and Doppler effects?
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Among passband ASK, FSK, and PSK, which is the most bandwidth-efficient under ideal channel conditions and why?
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What is the practical limitation of increasing the number of phase states in a passband PSK system?
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Why is non-coherent FSK preferred in low-complexity wireless sensor nodes despite slightly worse BER than coherent FSK?
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Why is PSK considered more power-efficient than FSK or ASK under the same bandwidth constraints in a passband system?
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In which scenario would passband FSK be preferred over PSK for digital communication?
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Why does the BER increase in higher-order passband PSK systems such as 8-PSK or 16-PSK?
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Why is ASK rarely used in modern passband wireless systems, even though it’s simple to implement?
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Which of the following will **most effectively** improve the performance of a passband PSK system in a fading channel?
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