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公开(公告)号：US11323177B2
公开(公告)日：2022-05-03
申请号：US17021289
申请日：2020-09-15
发明人： Lun Li , Yi Li , Sixiao Wei , Dan Shen , Genshe Chen
IPC分类号： H04B10/077 , H04B10/11 , G06N3/04 , G06K9/62 , G06N3/08
摘要： Various embodiments provide a method for free space optical communication performance prediction method. The method includes: in a training stage, collecting a large number of data representing FSOC performance from external data sources and through simulation in five feature categories; dividing the collected data into training datasets and testing datasets to train a prediction model based on a deep neural network (DNN); evaluating a prediction error by a loss function and adjusting weights and biases of hidden layers of the DNN to minimize the prediction error; repeating training the prediction model until the prediction error is smaller than or equal to a pre-set threshold; in an application stage, receiving parameters entered by a user for an application scenario; retrieving and preparing real-time data from the external data sources for the application scenario; and generating near real-time FSOC performance prediction results based on the trained prediction model.
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公开(公告)号：US11316583B2
公开(公告)日：2022-04-26
申请号：US16707927
申请日：2019-12-09
发明人： Lun Li , Jingyang Lu , John Nguyen , Dan Shen , Khanh Pham , Genshe Chen
摘要： The present disclosure provides a high power amplifier (HPA) linearization method, applied to a ground hub which includes a predistorter and a PD controller. The ground hub is arranged in a satellite communication system together with a transmitter and a satellite transponder, and the satellite transponder includes an HPA. The HPA linearization method includes determining an initial correction signal based on a physical model with a plurality of PD parameters to compensate AM-AM and AM-PM characteristics of the HPA; receiving a signal from the satellite transponder; determining a reward function for an action taken by the PD controller; examining an action-value function for actions taken in a preset past period; taking an action to adjust the plurality of PD parameters for the PD to generate an updated correction signal; sending the update correction signal to the transmitter to compensate the AM-AM and AM-PM characteristics of the HPA.
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公开(公告)号：US10778291B1
公开(公告)日：2020-09-15
申请号：US16358114
申请日：2019-03-19
发明人： Zhonghai Wang , Lun Li , Jingyang Lu , Genshe Chen , Weifeng Su , Xingping Lin , Xingyu Xiang , Wenhao Xiong
IPC分类号： H04B7/0413 , H04B17/391 , H04B17/336
摘要： A multiple-input and multiple-output (MIMO) bolt-on device for a single-input and single-output (SISO) radio, a MIMO channel emulator for testing the MIMO bolt-on device, and a MIMO channel emulation method are provided. The MIMO bolt-on device includes: a plurality of antennas, a multi-channel receiver, a plurality of couplers, a micro-controller, and a switch device. The multi-channel receiver includes a plurality of channels for signal transmission. Each coupler is configured to couple the multi-channel receiver with one of the plurality of antennas. The micro-controller is coupled to the multi-channel receiver to compare signals from the plurality of channels, thereby identifying a channel with a highest signal-to-noise (SNR) among the plurality of channels. The switch device is coupled to the micro-controller and configured to select an antenna corresponding to the channel with the highest SNR among the plurality of antennas for a connection between a selected antenna and the SISO radio.
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