[werk_ag]

A COMPARISON BETWEEN OOK/ASK AND FSK MODULATION TECHNIQUES FOR RADIO LINKS
DARRELL L. ASH
RF MONOLITHICS, INC., DALLAS, TEXAS

This paper will show that, when properly implemented, OOK can actually outperform FSK in both the areas of sensitivity and co-channel interference tolerance.


http://www.digikey.com.au/Web%20Export/S...arison.pdf

[Palmyweather]

A really interesting paper. It is amazing how much science is behind it.

[AllyCat]

Hi,

I've not read it in detail yet and it does look interesting, but does anybody know the DATE of issue of that report?  The most recent "Reference" is 1999.  There have been considerarable advances in the design and (over-)use of the 434 MHz band recently, culminating in technologies like "Lo-Ra".

An area where I would/might "change" (I will not use the word "improve") my own verion of the WeatherDuino Transmitter is to use a 3 volt (or no more than 5v) supply rail system (at much lower powers).

Cheers,  Alan.

[werk_ag]

OOK, ASK and FSK Modulation in the Presence of an Interfering signal
John Anthes, RF Monolithics, Dallas, Texas

"This paper discusses three popular modulation schemes in the presence of an interfering signal. For the purpose of our
discussion OOK modulation (On/Off Key) is the special case of ASK (Amplitude Shift Key) modulation where no carrier is present during the transmission of a zero. FSK modulation (Frequency Shift Key) is commonly believed to perform better in the presence of interfering signals. However, it is usually more difficult and expensive to implement. This paper will review the three modulation types and develop a mathematical model for the prediction of error due to interference. This is then followed by laboratory test results."

http://wireless.murata.com/media/product...es/ook.pdf