China Education Equipment Procurement Network News: According to a recent report from the American Physicists Organization Network, the latest "full-duplex" technology developed by American scientists enables wireless devices such as mobile phones to "talk" and "listen" to wireless base stations at the same frequency The transmitted signal changes the current situation where two frequencies are required to complete this task. The latest breakthrough will enable wireless network operators to double network throughput without building new base stations.
In the past, people always thought that full duplex could not be achieved. Leading the research, Rice University ’s professor of electrical and computer engineering, Azoto Shibuhavar and colleagues last year confirmed the feasibility of full-duplex for the first time. Since then, scientists around the world have begun competing to prove that this technology can be used in actual networks.
Full-duplex technology can make the network throughput higher and connection reliability better; equipment manufacturers can also add it as an additional mode to existing hardware devices, no need to add new hardware that only supports full duplex . Sabhawal said that this is like an empty field where two people are standing far away from each other. If they shout to each other at the same time, everyone cannot hear what the other is saying. A simple solution is to let only one person speak at a time within a given time. The mobile phone uses two different frequencies to receive and send information respectively, thereby achieving two-way communication.
Sabhawal said: "We send two signals, and at the receiving antenna, the two signals will cancel each other. However, this cancellation effect only occurs locally, so other nodes on the network can still receive what we send out. Signal. "The cancellation effect is theoretically simple and has been proposed for a long time, but so far no one has found a way to do this at a lower cost without using complicated new hardware.
Now, the Sabhawar team has achieved full-duplex wireless communication by using an additional antenna and some calculation techniques. Sabhawal said: "We have implemented a slight change to the multiple input and output antenna system (MIMO) to achieve full duplex. MIMO is very common in existing equipment, which uses several antennas to improve the performance of the entire system, and we Using multiple antennas as a full-duplex framework, the entire conversion process does not require new hardware equipment, so it is favored by wireless network operators. "
The Sabhawar team also achieved asynchronous full-duplex for the first time. This technology enables signals to be received during transmission, allowing wireless operators to maximize the use of network channels.
Sabhawar said that the latest method requires the least hardware and is favored by wireless companies. Rice University is planning to add full-duplex innovation to its "wireless open-frame network research platform" for other scientists to use.
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