Solution:

The Modulation type of ADAM-4550 is QPSK. QPSK (quadrature phased shift keying) and BPSK (binary phase shift keying) are the two most prevalent types used today in wireless LANs. For the detail spec of these two type, you can refer to the following website : http://www.chipcenter.com/eexpert/msciarra/msciarra001.html