Zhejiang University

Zhejiang Huahai Pharmaceutical Co., Ltd.

Zhejiang Huahai Zhicheng Pharmaceutical Co., Ltd

Min Li

Jing Wang

Jinsheng Lin

Wenquan Zhu

Minjian Zhao

Dan Li

Liyan Li

Wenbin Chen

Yue Li

Yongcheng Liu

Jiayu Zhang

Xiaofei Liu

Provided are a pregabalin lactam methylene dimer and a preparation method therefor. The method comprises the following steps: dissolving pregabalin in a reaction solvent, reacting same with an aldehyde in an acidic system and isolating the obtained target product pregabalin lactam methylene dimer. The preparation method for pregabalin lactam methylene dimer provided by the present application has a simple operation, a high product yield, a good purity and a low cost.

Pregabalin lactam methylene dimer and preparation method therefor

A multi-user uplink and downlink beam alignment method for asymmetric millimeter wave large-scale MIMO includes constructing an all-digital multi-directional beam for multiple-direction probing; performing multiple rounds of downlink beam training from the base station to the UE; controlling the UE to perform a beam decision according to the receiving signals, and determining a target downlink sending-receiving beam pair; performing data processing on the receiving signals to generate training data for predicting an uplink sending narrow beam, and performing training on a preset neural network; performing online real-time signal detection based on the trained network parameters and the receiving signals to predict a target uplink sending narrow beam; and controlling the UE to feedback an index of a target downlink sending narrow beam to the base station, and widening the target downlink sending narrow beam into a target uplink receiving beam according to the feedback index.

Multi-user uplink and downlink beam alignment method for asymmetric millimeter wave large-scale MIMO

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Zhejiang, China

Min Li