Also known as Wi-Fi (Wi reless Fi delity). The IEEE standard for an 802.11 wireless local area network (WLAN) operating in the 2.4-GHz band. 802.11b transmission options include infrared (IR), which is rarely used, and radio frequency (RF). 802.11b uses direct sequence spread spectrum (DSSS) modulation. DSSS involves the transmission of a bit stream that is modulated with the Barker code chipping sequence. Each bit is encoded into a redundant 11-bit Barker code (e.g., 10110111000), with each resulting data object forming a chip. The chip is put on a carrier frequency in the 2.4 GHz range (2.4