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I mean to say is. suppose your transmitting power is same & suppose we increase distance of transmitter from receiver will effect performance of circuit?
like say transmitting power is 0dBm & we are getting good response at distance of 100 meter. but suppose we make that distance 500 or 1000 meter will you recommend ASK signal transmission? or you wil go for FSK in this case.
The question is not well put, in my opinion;
what I would say is: in a TX-RX link budget suppose you have TX power at 0 dBm and RX sensitivity at -100 dBm. This will cover a certain distance in LOS (line of sight) at a certain RF freq that does not depend on modulation.
FSK has advantages respect to ASK because it is less difficult to implement (or it may need less current consumption). But this is only a general statement, it depends on the cost of the solution, the numbers of channels the kind of application and so on.
Historically FSK (with its derivatives, GFSK, MSK..) comes after ASK and now is widely used for short range communications or low data rate systems, ASK is still proposed in RFIC moslty for legacy reasons.
I hope it can help.
Mazz
In addition to the other comments, in FSK (or any phase modulation) the information is in phase not amplitude, so you can have PA that operates in its saturation point (high efficiency) and have longer battery life. In ASK, PA has to be linear with a good Peak to Average ratio. That usually means class A or class AB amplifiers that their efficiency less.
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