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liletian
Joined: 06 Mar 2008
Posts: 159
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 22 Sep 2008 22:20 advantages of fsk |
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Hi Guys
Why FSK is actually more popular than ASK? What's the advantages of FSK over ASK?
Thanks
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flatulent
Joined: 19 Jul 2002
Posts: 4875
Helped: 324
Location: Middle Earth
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23 Sep 2008 0:20 advantages of fsk over ask |
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| FSK is 3 dB better for a given peak transmitter power. It is easier to decode.
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liletian
Joined: 06 Mar 2008
Posts: 159
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23 Sep 2008 0:48 fsk advantages |
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I did not get you, can you explain more?
Thanks
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Abhishekabs
Joined: 12 Jan 2007
Posts: 727
Helped: 84
Location: India
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23 Sep 2008 5:47 advantage of fsk |
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FSK is more popular than ASK because of following
1) good noise performance than ASK
2) Can get good sensitivity than ASK
3dB better than transmitted power means
FSK has 3dB more sensitivity than ASK.
Am I right flatulent?
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vfone
Joined: 10 Oct 2001
Posts: 2327
Helped: 326
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23 Sep 2008 10:29 advantages and disadvantages of fsk |
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| If is properly implemented ASK could have better sensitivity than FSK. Also co-channel performance of ASK receiver is superior to the FSK receiver.
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Abhishekabs
Joined: 12 Jan 2007
Posts: 727
Helped: 84
Location: India
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23 Sep 2008 10:47 why fsk |
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what about long distance communication?
say 500 meter.
will ASK show good sensitivity than FSK?
I dont think so.
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vfone
Joined: 10 Oct 2001
Posts: 2327
Helped: 326
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23 Sep 2008 13:21 advantages of fsk modulation |
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| Receiver sensitivity doesn’t have anything with distance.
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Abhishekabs
Joined: 12 Jan 2007
Posts: 727
Helped: 84
Location: India
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23 Sep 2008 14:06 advantages of frequency shift keying over ask |
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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.
this is my doubt.
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23 Sep 2008 14:06 Ads |
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Mazz
Joined: 03 Nov 2001
Posts: 592
Helped: 80
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23 Sep 2008 14:24 advantages using fsk over ask |
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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
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anguo
Joined: 21 Sep 2008
Posts: 1
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25 Sep 2008 3:49 advantages of frequency shift keying |
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| o, right
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kiavash
Joined: 05 Nov 2007
Posts: 19
Helped: 3
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26 Sep 2008 18:16 ask fsk advantage |
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| liletian wrote: |
Hi Guys
Why FSK is actually more popular than ASK? What's the advantages of FSK over ASK?
Thanks |
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.
Hope this helped
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