In IEEE 802.11b standard, four types of modulations are supported.They are 1Mbps DBPSK, 2Mbps DQPSK, 5.5Mbps CCK and 11Mbps CCK.

• IEEE802.；11b标准规定了四种调制方式，分别是1Mbps DBPSK、2Mbps DQPSK、5