standard 802.11g issued in 2003 extends standard 802.11b with higher transmission rates. 802.11g contains the previous 802.11b modes and also integrates the ofdm method used in 802.11a for frequencies in the 2.4 ghz ims band. 802.11g-conforming ofdm modulation can also be generated by the r&s® winiqsim software. 802.11g also defines two optional modes for which r&s® winiqsim supports the extended pbcc methods with data rates of 22 mbps and 33 mbps. in contrast to the 5.5 mbps und 11 mbps pbcc modes, a rate 2/3 convolutional coder and 8psk modulation are used. with 33 mbps, also the clock rate in the data section of the packet is increased to 16.5 mcps.
common for all three types a, b and g is, that the 802.11 wireless lan standard is a packet-oriented method for data transfer. the data packets are transmitted and received on the same frequency in time division duplex (tdd), but without a fixed timeslot raster. an 802.11 component can only transmit or only receive packets at any particular time.