Multi-antenna transmission technology: Multi-antenna transmission technology: It has become the most important and indispensable technology in our 5g research. It can increase spectrum utilization by more than 10 times, enabling conversion from 2D to 3D, from passive to active, and a range of high-order multi-input multi-output arrays. At the same time, the same frequency full duplex technology can transmit signals in both directions on the same physical channel. Therefore, the same frequency full duplex technology is considered to be an effective technology to improve spectrum utilization. The technology can achieve bidirectional signal transmission on the same physical channel. Transmission, that is, the duplex node's receiver to eliminate the transmitter signal interference, and at the transmitter signal from another node to receive the same frequency of the signal. This can effectively improve the spectrum utilization rate, so that mobile communication network is flexible and stable.
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