Multi-carrier code-division multiple access: Difference between revisions

Revision as of 19:50, 23 June 2009

Revision as of 09:33, 10 July 2009

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As an example of how the 2D spreading on [[VSF-OFCDM]] works, if you take the first data symbol, ''d''₀, and a spreading factor in the time ___domain, ''SF''_time, of length 4, and a spreading factor in the frequency ___domain, ''SF''_frequency of 2, then the data symbol, ''d''₀, 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 15 Gbit/s transmissions to receivers travelling at 2010&nbsp;km/h and 2.5 Gbit/s to stationary receivers using its [[4G]] prototype system in a 100 MHz-wide channel. This [[4G]] prototype system also uses a 4x412x12 antenna [[MIMO]] configuration, and [[turbo coding]] for error correction coding.<ref>{{cite web|url = http://www.nttdocomo.com/pr/2007/001319.html|date=2007-02-09|publisher=[[NTT DoCoMo]] Press|title=DoCoMo Achieves 5&nbsp;Gbit/s Data Speed}}</ref>

==References==