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As an example of how the 2D spreading on [[VSF-OFCDM]] works, if you take the first data symbol, ''d''<sub>0</sub>, and a spreading factor in the time ___domain, ''SF''<sub>time</sub>, of length 4, and a spreading factor in the frequency ___domain, ''SF''<sub>frequency</sub> of 2, then the data symbol, ''d''<sub>0</sub>, will be multiplied by the length-2 frequency-___domain PN codes and placed on subcarriers 0 and 1, and these values on subcarriers 0 and 1 will then be multiplied by the length-4 time-___domain PN code and transmitted on [[OFDM]] symbols 0, 1, 2 and 3.<ref>http://citeseer.ist.psu.edu/atarashi02broadband.html Broadband Packet Wireless Access Based On VSF-OFCDM And MC/DS-CDMA (2002) Atarashi et al.</ref>
[[NTT DoCoMo]] has already achieved 5{{nbsp}}Gbit/s transmissions to receivers travelling at 10 km/h using its [[4G]] prototype system in a 100 MHz-wide channel. This [[4G]] prototype system also uses a 12×12 antenna [[MIMO]] configuration, and [[turbo coding]] for error correction coding.<ref>{{cite web|url
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