Fujitsu Ltd and Fujitsu Laboratories Ltd have developed the world's first impulse radio-based high-capacity wireless transmission equipment using millimeter-band transmissions in the 70GHz to 100GHz range band, resulting in throughput exceeding 10Gbps. This technology, based on the company’s indium-phosphide high electron mobility transistor (InP HEMT), dispenses with the oscillators and other components that have been required in conventional wireless transmission technologies, enabling compact and inexpensive millimeter-band transmission equipment.
Fujitsu Laboratories used a new circuit for the InP HEMT short-pulse generator, which generates a short pulse based on a 10GHz clock signal, which has minimal jitter compared to the 10Gbps data signal, while referencing the 10Gbps data signal.
The new technology is suitable as an alternative to fiber-optic trunk lines in regions where those lines would be difficult to lay, as a way to bridge the digital divide, and can also be used for ultra-fast wireless LANs. The impulse-radio millimeter-band transmission equipment includes a baseband unit with a fiber-optic interface. The receiver had a sensitivity of 0.25µW, and along with the sensitivity needed for kilometer-class wireless transmissions, was demonstrated to achieve good received waveforms. The transmitter held jitter on a 10Gbps millimeter-band pulse signal to 0.3ps, an improvement of more than fivefold over the level of stability achieved in 2008. Indoor transmission testing with a paired transmitter and receiver resulted in the world's first wireless transmissions to exceed 10Gbps using impulse radio in the millimeter band.
This research was conducted as part of the Research and Development Project for Expansion of Radio Spectrum Resources sponsored by Japan's Ministry of Internal Affairs and Communications. Details of this technology were presented at the 2009 IEEE MTT-S International Microwave Symposium (IMS 2009) being held in Boston from June 7 to June 12.
Fujitsu
Fujitsu Laboratories
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