While those of us in the US and elsewhere continue to wait for
third-generation mobile phone networks on the scale that exists in
Europe and East Asia, Japanese researchers are already playing around
with fourth-generation mobile phone networks....
4G Prototypes Reach Blistering Speeds
Cellphones capable of transmitting data at blistering speeds have been
demonstrated by NTT DoCoMo in Japan.
In experiments, prototype phones were used to view 32 high definition
video streams, while travelling in an automobile at 20 kilometres per
hour. Officials from NTT DoCoMo say the phones could receive data at 100
megabits per second on the move and at up to a gigabit per second while
static. At this rate, an entire DVD could be downloaded within a minute.
DoCoMo's current 3G (third generation) phone network offers download
speeds of 384 kilobits per second and upload speeds of 129 kilobits per
second.
The technology behind NTT DoCoMo's high-speed phone network remains
experimental, but the 4G tests used a method called
Variable-Spreading-Factor Spread Orthogonal Frequency Division
Multiplexing (VSF-Spread OFDM), which increases downlink speeds by using
multiple radio frequencies to send the same data stream.
http://www.newscientist.com/article.ns?id=dn7943
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Andy Carvin
Program Director
EDC Center for Media & Community
acarvin @ edc . org
http://www.digitaldivide.net
http://katrina05.blogspot.com
Blog: http://www.andycarvin.com
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