World's-first compact transceiver forterahertz wireless communication using300-GHz band10 June 2016

Transmitter (NTT)

Nippon Telegraph and Telephone Corporation,Fujitsu, and the National Institute of Informationand Communications Technology havecooperatively developed the world's-first compactterahertz wireless transceiver using the 300-GHzband and experimentally demonstrated that it cantransmit data at transmission rate of 40 gigabitsper second through multiplex transmission usingorthogonal polarization.

Since the transceiver can assure a broadfrequency band, it is expected to be applied forhigh-speed wireless communication. Moreover, inthe present development, under a supposed usagecase in which large-capacity contents aredownloaded from an information terminal (such asdownloading video and music), the transmitter ofthe developed transceiver was installed in such aninformation terminal.

Moreover, according to the results of a contents-downloading experiment using a compact (i.e.,smartphone-sized) terminal fitted with a matchingdeveloped receiver, data transmission of twogigabytes per second (namely, downloading at arate of one DVD's worth of data in about three

seconds) was achieved. Through this experiment, itwas shown that a compact transceiver usingterahertz waves in the 300-GHz band—as well asthe accompanying elemental circuittechnology—could achieve large-capacitytransmission. From now onwards, it is expectedthat technologies utilizing terahertz waves in the300-GHz band will make major advances.

Receiver (Fujitsu)

The developed technology was presented in detailat IMS2016 (2016 IEEE MTT-S InternationalMicrowave Symposium) held in San Francisco fromMay 22nd, 2016.

As broadband networks continue to spread,investigations on high-speed data transmission viawireless communication are progressing across theworld. To attain transmission rates at the level ofthe several-dozen gigabits per second (which willenable uncompressed realtime wirelesstransmission of ultra-high-definition images andinstantaneous transfer of large-capacity data), it isnecessary to utilize presently unused frequencybands. In particular, it is necessary to develop acompact wireless device that can handle high-speed data transfer. Terahertz wireless

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communication is a promising technology formeeting that need, and utilization of the 300-GHzband (which is presently unused by industry) isexpected to open up new frequency resources.

Experiment of radiowave propagation and measurementtechnology (NICT)

Results of experiment

(1) Experiment on high-speed data transmissionusing a compact transceiver for terahertz wirelesscommunication

In this experiment, an InP-based high-electron-mobility transistor (InP-HEMT) was used as anultrahigh-speed device and incorporated in a high-frequency transceiver circuit designed as anintegrated circuit (IC). In this manner, a compacttransceiver for terahertz wireless communicationusing the 300-GHz band was created. Thetransmitter enables 20-Gbps data transmission asan integrated architecture connecting (via awaveguide) a metal package housing the IC and anantenna . Moreover, under the assumption that thereceiver will be mounted in a smartphone-sizedterminal, mounting the IC in the antenna-integratedmetal package resulted in an overall size of 1 cc(previously reported). The receiver demodulates a20-Gbps wireless signal (received via the wirelesssection) and outputs it as a data signal. In addition,as for radiowave propagation and measurementtechnology concerning the 300-GHz band, high-speed data transfer was verified by an experiment

performed in an anechoic chamber.

Configuration of system

In this verification experiment, the transmitter and asignal processor for forward error correction (FEC)etc. (both developed by NTT), the receiver(developed by Fujitsu), and the radiowavepropagation and measurement technology(developed by NICT) were brought together in theconfiguration. With the developed transmitter andreceiver set facing each other, 20-Gbps datatransfer was achieved. As a result, as fortransmission distances exceeding 1 m, thepossibility of error-free transmission was confirmed.

Furthermore, an experiment on polarization-multiplexing transmission using two transceiversets and a polarized waves perpendicular to eachother was performed, and the results of theexperiment confirmed that 40-Gbps data transfer ispossible. These experiments confirmed sufficientperformance as a wireless device transceiver andthe utility of the developed technology.

(2) Verification experiment simulating a data-downloading service

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System for experimental verification

With the developed transmitter installed in aninformation terminal, and the matching developedreceiver installed in a smartphone-sized terminal, averification experiment simulating a service fordownloading data (by touching the smartphone-sized terminal on the information terminal) wasperformed. In this experiment, video files stored ina PC on the transmission side (i.e., a contentsserver) were used, and the transfer rate concerningthose files was evaluated. As a result, high-speeddownloading of data at 2 GB/s (gigabytes persecond)—equivalent to downloading at a rate of oneDVD's worth of data in about three seconds—wasconfirmed. Under the aim of providing a high-speeddownloading service, although investigations onusing millimeter waves are presently progressing,the effectiveness of using terahertz wirelesscommunication to further increase data-transferrate was confirmed in this experiment.

From now onwards, while further increasing data-transfer rate and improving efficiency of thecommunication sequence, in anticipation of studieson frequency utilization, we will continue ourvigorous investigations on usage cases in additionto contents downloading.

Smartphone-sized terminal housing the receiver

Provided by National Institute of Information andCommunications Technology (NICT)

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APA citation: World's-first compact transceiver for terahertz wireless communication using 300-GHzband (2016, June 10) retrieved 24 July 2022 from https://phys.org/news/2016-06-world-first-compact-transceiver-terahertz-wireless.html

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