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Siemens Develops 1 gbit/sec Wireless Link

Posted by timothy on from the beam-forth-your-data dept.

jonknee writes "Siemens has developed mobile wireless technology with transfer rates as high as 1 gigbit per second. This blows the doors off of '3G' technology, or EV-DO (the high-speed data technology used by Verizon Wireless and soon by Sprint PCS). Not all the specs are out yet (more info is expected early next year), but it uses three transmitting and four receiving antennas. With any luck the phone in your pocket will have a gigabit link by the year 2015."

2 of 191 comments (clear)

  1. Re:Faster than 3G .. heck, its faster than 802.11G by Anonymous Coward · · Score: 3, Informative

    Multiple antennas.. sounds like a variant of BLAST:

    http://www1.bell-labs.com/project/blast/

    They claim >20bps/Hz by making lemonade out of multipath's lemon.

  2. Re:Thanks Zak, you made this thread Informative by ZakMcCracken · · Score: 3, Informative

    It's not oversimplified to say that, in fact it's a common practice. In QAM modulation systems (Quadrature and Amplitude Modulation), "complex amplitude" (i.e. amplitude + phase) modulates a waveform with not just two values (+1 and -1) but four values (1, i, -1, -i) or more...

    The set of amplitude values is represented in the complex plane as a "constellation". At the receiving end, you have to "recover" the amplitude and the phase of the emitted signal, which is the process of synchronisation.

    In cable (coaxial) networks, where attenuation is lower than in free-range transmissions, 64-QAM or even 256-QAM (a modulations with 256 complex values, an 16x16 square in the complex plane) is commonly used.

    Power and range do limit the effectiveness of modulations. In GPRS/EDGE packet radio, for example, QAM schemes are varied as a function of radio conditions to avoid using too ambitious of a modulation for what the channel can support.