#### Bram Jester

##### Newbie level 4

Just wondering if someone could help me out:

I have the following:

Eb/N0 uplink = 18.4dB

Eb/N0 downlink = 11.8dB

The formula that I am using is: (Eb/N0 uplink x Eb/N0 downlink) / (Eb/N0 uplink + Eb/N0 downlink)

I get 7.19dB

The answer is 10.9dB

I think my problem is that I have to convert dB to something, but I don't know how do I convert the dB so that I can use it in my equation?

Cheers,