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World's fastest CMOS wireless transceiver at 56Gbit/s

Posted: 02 Feb 2016 ?? ?Print Version ?Bookmark and Share

Keywords:Tokyo Institute of Technology? Fujitsu Laboratories? mm-waveband? CMOS? wireless transceiver?

Tokyo Institute of Technology and Fujitsu Laboratories Ltd joined forces to further enlarge the capacity of wireless equipment. They have developed a CMOS wireless transceiver chip that can process signals at high speeds with little loss across a range of frequencies, from 72GHz to 100GHz, achieving wireless transmission speeds of 56Gbit/s, the world's fastest, according to them. They also developed technology to modularise it.

In recent years, to cope with the large increase in data traffic resulting from the widespread use of smartphones and other devices, networks that link base stations use optical fibre. One issue with this approach, however, is that it is difficult to expand service in areas where it is difficult to install a network of optical fibre cables, such as in urban areas or areas surrounded by rivers or mountains. To deal with this issue, Tokyo Institute of Technology and Fujitsu Laboratories have developed high-speed wireless transceiver technologies that use the mm-waveband (30GHz to 300GHz), where there are few competing wireless applications, and which are capable of large-capacity communications.

Transceiver CMOS chip and module

Transceiver CMOS chip and module

This technology makes it possible to have high-capacity wireless communications equipment that can be installed outdoors in applications where fibre-optic networks would be difficult to lay.

The CMOS wireless transceiver chip and the wireless module that includes it are comprised of two key technologies.

1. Low-loss, high-bandwidth transceiver circuit

Tokyo Institute of Technology developed a technology for broadband, low-loss transceiver circuits in which data signals are split in two, with each converted to different frequency ranges, and then recombined. Each signal is modulated into a band 10GHz wide, with the low-band occupying the 72GHz to 82GHz range, and the high-band occupying the 89GHz 99GHz range. This technology enables modulation on an ultra-wideband signal of 20GHz, with low noise and a similar range in the ratio between input and output power as existing 10GHz band methods, which results in high-quality signal transmissions.

Tokyo Institute of Technology also developed an amplifier to send and receive as radio waves signals converted to the mm-waveband. The ultra-wideband amplifier for 72GHz to 100GHz was designed with circuit technologies that stabilize the amplification ratio by feeding the amplitude of the output signal back to the input side for signal components whose amplification ratio decreases based on frequency.

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