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NTT successfully demonstrated OAM multiplexing technology to achieve a peak rate of 100Gbps, a 100x improvement over LTE and WiFi, and a 5x improvement over 5G NR.
From 4G to 5G, the spectrum efficiency of 5G NR is limited. For this reason, 5G needs to introduce more spectrum resources and antennas.
For various 5G applications such as VR/AR, car networking, smart factories, etc., the demand for spectrum resources will become larger and larger.
The problem is obvious. The shortage of spectrum resources has become the bottleneck of the development of mobile communication technology. To meet the needs of mobile services in the future, we must explore revolutionary innovations to achieve a huge leap in wireless transmission capacity.
Breakthrough technology is here!
This technology, like the auger of the bottle opener, unscrews the Tb-class (Terabit, terabit) wireless transmission era.
A few days ago, NTT successfully demonstrated OAM multiplexing technology, achieving a peak rate of 100Gbps, a 100-fold improvement over LTE and WiFi, and a 5x improvement over 5G NR.
NTT claims that this is the world's first successful implementation of 100Gbps wireless transmission using OAM technology.
What is God technology for OAM reuse?
OAM, Orbital Angular Momentum, Orbital Angular Momentum
Electromagnetic fields not only transmit energy but also carry momentum. Orbital angular momentum is another important physical quantity of the electric field intensity of the electromagnetic wave. It provides another dimension besides frequency, phase and space for electromagnetic waves, which brings people a new perspective to understand and utilize electromagnetic waves.
Under the influence of the spiral phase factor, the electromagnetic wave with OAM is called "vortex electromagnetic wave" and spirals along the propagation direction. The number of phase rotations of electromagnetic waves having OAM is referred to as an OAM mode. Different OAM modes are orthogonal to each other, and multiple orthogonal signals can be transmitted at the same frequency point, thereby improving spectral efficiency and channel capacity. This is the OAM multiplexing technology.
â–²OAM reuse principle
The OAM multiplexing technology utilizes the orthogonality of the OAM mode to modulate multiple signals in different OAM modes, and distinguishes different channels according to different modes. In theory, OAM multiplexing can be used to obtain infinite transmissions on the same carrier frequency. ability.
How is this demonstration concretely implemented?
NTT designed an OAM-MIMO multiplexing technology that combines OAM multiplexing and MIMO technology.
This antenna system is like this. . .
It consists of four concentric uniform circular arrays (UCA #1-4) and a centrally located single antenna element (UCA#0). UCA #0-4 generates orthogonal multiplexing of five different OAM modes of -2, -1, 0, 1, 2, and separates the multiplexed signals in the same mode by MIMO technology, and finally realizes up to 21 channels of multiplexing. The data signals are transmitted simultaneously, which greatly increases the transmission rate.
â–²OAM-MIMO multiplexing technology implementation principle
Since 1992, the Orbital Angular Momentum (OAM) of light has been widely concerned by Allen et al. OAM's research was first concentrated in the field of optics, and then gradually transitioned to the radio wave band.
NTT said that the OAM-MIMO multiplexing technology will be tested in the 28 GHz millimeter wave band to replace the hard-to-lay fiber as a network relay transmission.
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Dongguan Yuantong Technology Co., Ltd. , https://www.ytbagmachine.com