80211_mac/simple_mac.py doesn't implement 802.11PHY?

Hi all,
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I ran the 80211_mac/simple_mac.py. I have not succeeded to run the
simple_mac.py. Errors keep happening. I thought simple_mac.py used
802.11 PHY such as barker codes. I think simple_mac.py does not use the
802.11 PHY after I read the code again and got the error as following:
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./simple_mac.py

fusb_block_size = 1024
fusb_nblocks   = 16
Traceback (most recent call last):
 File “./simple_mac.py”, line 411, in
   main()
 File “./simple_mac.py”, line 359, in main
   fg = my_graph(blks.gmsk2_mod, blks.gmsk2_demod,
AttributeError: ‘module’ object has no attribute ‘gmsk2_mod’
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Could anyone please tell me if the simple_mac.py uses 802.11 PHY
already or users have to modifiy the PHY to 802.11 PHY by ourselves?Â
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I feel so confused because I think BBN should use 802.11PHY.
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Thank you,
Jane