In IEEE 802.11b wireless LANs (WLANs), a process that organizes data bits into a series of complementary sequences that form 64 unique six-bit code words. Differential quaternary phase-shift keying (DQPSK) then modulates the code bits to form complex bit pairs known as chips, eight of which form a symbol, which is the smallest CCK transmission unit. In 802.11b WLANs operating at 5.5 and 11 Mbps, the symbol rate is 1.375 MSps and the chip rate is 11 Mchips per second. At 5.5 Mbps, 4 data bits are mapped into the 8 chips of each symbol. At 11 Mbps, 8 data bits are mapped into the 8 chips of each symbol. See also 802.11b, chip, DQPSK, encode, IEEE, modulate, symbol, and WLAN.