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Compare ASK , PSK & FSK systems.
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Parameters ASK FSK PSK
Variable characteristics Amplitude Frequency Phase
Bandwidth Is proportional to signal rate (B =(1+d)S),d is due to modulation & filtering ,lies between 0 & 1. B=(1+d)×S+2Δf B=(1+d)×S
Noise immunity low High High
Complexity Simple Moderately complex Very complex
Error probability High Low Low
Performance in presence of noise Poor Better than ASK Better than FSK
Bit rate Suitable upto 100 bits/sec Suitable upto about 1200 bits/sec Suitable for high bit rates
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