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June 19, 2006

DVD Gone in 10 Seconds (Wirelessly)

By Glenn Fleishman

Technology Review reports that NTT DoCoMo has a prototype wireless network operating at 2.5 gigabits per second (Gbps): It’s mobile, working at 20 kph, and could move a DVD across in about 10 seconds. They use MIMO with six antennas, but they mention neither spectrum band nor channel width. And it’s impossible to stick this receiver in a handheld device right now, either.

There’s an obscure note about tweaking QAM, part of the modulation used to carry multiple symbols over a single channel or subchannel, but increasing the number of symbols per modulation (the effective raw bit rate) typically requires a greater signal to noise ratio. That is, more power or more bandwidth than a channel that can only carry a smaller amount of symbols.

The article identifies this as part of the 4G direction, in which everything is Internet Protocol and speeds are orders of magnitude higher. But it cautions that this is several years away.

Posted by Glennf at June 19, 2006 10:43 AM

Categories: Future


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