commdigbbndam2 library is out-of-date library.
I think Mathworks does not support any more.
You can change each block in new communication library.
But you might not get the correct original parameter value.
Fortunately, this model is included in each Matlab Demo.
You can find it in Help menu.
08 Oct 2013
IEEE 802.11a WLAN model
IEEE 802.11a WLAN physical layer model, with demonstration of adaptive modulation and coding.
Does any one knows why do I get this error
"Failed to load library 'commdigbbndam2' referenced by 'IEEE80211a/Demodulator/Demodulator 1/Rectangular QAM Demodulator Baseband'
Unable to load block diagram 'commdigbbndam2'"