a) Sketch the unique signals, one each for 000, 001, 010,
An abbreviation for Amplitude Shift Keying is called ASK. It's a digital modulation technique. In this technique, the amplitude of the RF carrier is varied according to the baseband digital input signal.
• ASK has a higher probability of error (Pe) and a lower SNR.
• Lowest noise immunity. • ASK is a bandwidth efficient system but less power efficient.
An abbreviation for frequency shift keying is called FSK. This is also a digital modulation technique. In this technique, the RF carrier frequency varies according to the digital baseband input.
• For FSK, Pe is small and SNR is high. • This technique is widely used in modern design and development.
• Better immunity to interference, but requires more bandwidth than other types of modulation.
The abbreviation for phase shift keying is called PSK. This is a digital modulation technique that changes the phase of an RF carrier based on a digital input.
• Using PSK reduces the probability of error. High SNR.
• Energy efficient system, but less bandwidth efficient.
• PSK modulation is commonly used in wireless transmissions.
• Basic PSK and ASK modulation variants are QAM, 16-QAM, 64-QAM, and so on.
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