Where To Find This Example
Select Help > Open Examples... from the menus and type either the example name listed above or one of the keywords below.
Or in Version 14 or higher you can open the project directly from this page using this button. Make sure to select the Enable Guided Help before clicking this button.
ON - OFF Keying
This example shows a complete ON - OFF Keying system in VSS.
OOK has equivalent BER performance with coherent binary FSK. For both:
BER = Pb(e) = Q(sqrt(Eb/No)).
So, we use AWGN set at "Bit energy, dBm", and we set it to
PWR = 10 - 3 - EbNo.
This is because the transmitted symbol has amplitude 1.0 (so 10dBm), but the average bit energy Eb is 1/2 of that, since on the average 50% of the transmitted symbols are zeros.
Therefore, the average transmitted Eb is 7dBm, and of course the noise density per bit needs to be set to:
7 - EbNo.
In fact, one can observe that BER aligns with the theoretical result for coherent binary FSK.
The "Integrate and Dump" is needed, as it is the Matched Filter receiver for this OOK transmission scheme.
The Waveforms at various places in the system are shown in "WAVEFORMS" Graph and the "BER" Graph shows the theoretical curves for Coherent FSK, BPSK and real time OOK BER.