Development of innovative technology that doubles the throughput in full-duplex communication is ongoing

ByChristopher Chan

In bidirectional communication such as mobile communication, it is necessary to be able to transmit and receive data from both sides at the same time, and prepare lines for uplink and downlinkFull duplexCommunication is used. In high-speed mobile communication · LTE provided by mobile phone companies in Japan, Europe and the United States,FDDIt is adopting the communication system that divides the frequency band, and since it is possible to allocate more bandwidth to the downlink, upload speed is slower than downloading. However, the development of a technology that can secure the band full upstream and downstream with the FDD method is in progress.

Full duplex: A fundamental radio tech breakthrough that could double throughput, alleviate the spectrum crunch | ExtremeTech
http://www.extremetech.com/extreme/187190-full-duplex-a-fundamental-radio-tech-breakthrough-that-could-double-throughput-alleviate-the-spectrum-crunch

For high frequencies used for mobile communication, there is a restriction called "hearing" that the transmitted wave interferes with the receiver even if it tries to transmit and receive at the same frequency, so that it can not grasp the received wave well.

Currently, in the FDD method which carries out simultaneous transmission and reception by dividing the band, simultaneous transmission / reception is performed by switching the transmission / reception fast at the time axis by dividing the bandTDDAlthough it is avoiding the problem of hearing by dividing by time in the method, it is inevitable that it can not say that the network can not be utilized to the utmost in any communication method of FDD method and TDD method I will.


In order to avoid the constraints imposed by the physical properties of such high frequencies and make full use of the network, the start-up companies launched by Stanford University faculty members in 2012Kumu Networks(Kumu) succeeded.

Kumu prevents howling in order to prevent interference of transmitted wave and received waveEcho cancellerIt applied that technology. Kumu's vice president of Joel Brand said, "The receiver examines the radio wave environment of the high frequency, predicts how the received wave is interfered and changed depending on the radio environment, and then adjusts the high frequency to cancel the influence By sending out, simultaneous transmission / reception is realized in the form that it can receive the transmission wave without interference "and explains the mechanism.


By using interference wave canceling technology developed by Kumu, it is necessary to install multiple in FDD communicationDuplexerIt is possible to integrate LTE band 5/6/18/19/26/27 of 850 MHz and LTE band 8 of 900 MHz with one duplexer, for example.

Furthermore, Kumu's interference wave cancellation technology is used not only for wireless communication, but also for wired communication used in cable TV and the likeDOCSIS, It is also expected to improve the speed of wired lines by using lines more efficiently.

ByWłodi

Although Kumu did not clarify the company name, it has already been tested with major mobile telecommunications carriers in the US and Europe, decided on November 2014 about the basic design of the radio cancellation algorithm and communication method, We are planning to start demonstration experiments from the beginning of 2015.