receive frames with FCS errors

[Antonio Vilei]

Jean Tourrilhes wrote:

> error in unlicensed band are usually clustered (fading,
> interference), which means that packet that would "look" OK are
> usually not really usefull (which explain why FEC is useless, ask
> people using BlueTooth-SCO links about it).

Could you please explain what you mean by "look OK"? 

Why is FEC useless?

Thanks in advance,
Antonio