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1.
公开(公告)号:US11265814B2
公开(公告)日:2022-03-01
申请号:US15577523
申请日:2015-07-08
IPC分类号: H04W52/02 , H04L29/08 , H04W88/18 , H04W84/12 , H04L65/40 , H04L67/5651 , H04L67/125
摘要: A method for implementing a low power consumption IoT network based on a Wi-Fi proxy device. The network is used for low power consumption data exchange between a Wi-Fi IoT device having a long data period in a Wi-Fi IoT network and an internet server, via a Wi-Fi proxy IoT device and a Wi-Fi access point. A low power consumption Wi-Fi MAC layer link is provided between the proxy device and at least one Wi-Fi IoT device. The Wi-Fi IoT device only establishes a low power consumption Wi-Fi MAC layer link with the proxy device. The proxy device connects to the internet server via a Wi-Fi access point, and acts as a data receiving end to buffer data, from the internet server, that is sent to the Wi-Fi IoT device via the Wi-Fi MAC layer link.
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2.
公开(公告)号:US11202202B2
公开(公告)日:2021-12-14
申请号:US16469409
申请日:2018-03-09
发明人: Rui Zhan , Liwei Jiang , Shi Chen
IPC分类号: H04L29/06 , H04W12/06 , G06K9/00 , H04L5/00 , H04L29/12 , H04L29/08 , H04W12/08 , H04W12/03 , G16Y30/10 , H04W84/12
摘要: The present invention relates to an IoT control switch and method based on fingerprint identification permission control, comprising performing user identity and permission verification through fingerprint identification, implementing a MAC layer connectionless communication mechanism between a wire-free fingerprint Wi-Fi IoT switch and a standard Wi-Fi IoT device, and carrying control information for controlling the Wi-Fi IoT device by a privately defined control information element in a unicast packet or broadcast packet without requiring a MAC layer connection; the invention requires little modification, is cost effective to implement, and the data type, manner of acknowledgement, manner of encryption, and different fingerprint security control modes may be freely combined with each other, thereby providing wide applicability. The wire-free fingerprint Wi-Fi IoT switch may complete the translation of control information to the standard Wi-Fi IoT device by sending least number of packets, so as to realize low power consumption control. The wire-free fingerprint Wi-Fi IoT switch may also connect to an internet server via a Wi-Fi access point to perform update and upgrade of firmware, fingerprint feature information list, etc.
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公开(公告)号:US11791880B2
公开(公告)日:2023-10-17
申请号:US17434888
申请日:2019-12-03
IPC分类号: H04B7/06 , H04B7/0417 , H04L27/26 , H04L27/34 , H04L5/00
CPC分类号: H04B7/063 , H04B7/0417 , H04L27/2691 , H04L27/2695 , H04L27/3483 , H04L5/001
摘要: A signal detection method for a MIMO-OFDM wireless communication system includes obtaining a channel matrix of each subcarrier through channel estimation for each MIMO-OFDM data packet in a plurality of MIMO-OFDM data packets; receiving a reception vector of each subcarrier; performing channel matrix preprocessing for the channel matrix of each subcarrier to generate a global dynamic K-value table, in which the global dynamic K-value table includes a global dynamic K-value corresponding to each search layer of each subcarrier; performing MIMO detection for each OFDM symbol in the MIMO-OFDM data packet, in which the MIMO detection includes performing the following steps for each subcarrier of a current OFDM symbol: reading channel matrix preprocessing results and reception vector of the current subcarrier; transforming the reception vector of the current subcarrier into an LR search domain; and performing K-best search for the current subcarrier to obtain an LR domain candidate transmission vector of the current subcarrier, in which a K-value applied to each search layer of the current subcarrier during the K-best search is a global dynamic K-value in the global dynamic K-value table corresponding to the search layer.
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公开(公告)号:US20210282112A1
公开(公告)日:2021-09-09
申请号:US16489877
申请日:2018-04-24
发明人: Rui Zhan
摘要: The present invention relates to a positioning method and system based on a Wi-Fi IoT device network, wherein positioning monitoring nodes in a subnet respectively receives, within an information receiving and transmitting range thereof, a data packet sent by a same positioning target device, records corresponding data packet receipt clock information, and provides the data packet receipt clock information and identification information of the positioning target device to the subnet master node; the subnet master node utilizes signal arrival time differences between a plurality of positioning monitoring nodes receiving the data packet from the same positioning target device, and mutual physical distances between the positioning monitoring nodes, to compute the distance differences of the positioning target device with respect to the plurality of positioning monitoring nodes, and determine a position of the positioning target device in a physical coverage range of the subnet. The present invention may achieve the real-time positioning and monitoring of a large number of targets in a large physical range.
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5.
公开(公告)号:US11646925B2
公开(公告)日:2023-05-09
申请号:US16318561
申请日:2016-08-18
IPC分类号: H04L1/00 , H04W28/06 , H04W28/04 , H04L27/26 , H04W72/044 , H04J3/06 , H04W80/08 , H04B1/7115 , H04B17/29 , H04B1/707 , H04B1/69
CPC分类号: H04L27/2613 , H04B1/69 , H04B1/707 , H04B1/7115 , H04B17/29 , H04J3/0605 , H04L1/00 , H04L1/0061 , H04W28/04 , H04W28/06 , H04W72/0466 , H04W80/08
摘要: The present invention discloses a method for processing a preamble sequence and header for a data packet, comprising the following steps of: using a bit sequence of a fixed pattern to replace a scrambled pseudo-random bit sequence in a SYNC field in the preamble sequence, and spreading the SYNC field by a Barker code; extending a length of a spreading code and spreading an SFD field in the preamble sequence by the extended spreading code; and extending a length of a spreading code and spreading a header field by the extended spreading code. The present invention may significantly improve the performance of reception and detection for the preamble sequence (the SYNC field and the SFD field) and the PLCP header field, better overcome long-distance channel conditions, enhance the signal stability of transmission; and meanwhile the present invention is easy to implement and only requires little modifications to the circuit of a conventional Wi-Fi device.
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公开(公告)号:US11310761B2
公开(公告)日:2022-04-19
申请号:US16489877
申请日:2018-04-24
发明人: Rui Zhan
摘要: The present invention relates to a positioning method and system based on a Wi-Fi IoT device network, wherein positioning monitoring nodes in a subnet respectively receives, within an information receiving and transmitting range thereof, a data packet sent by a same positioning target device, records corresponding data packet receipt clock information, and provides the data packet receipt clock information and identification information of the positioning target device to the subnet master node; the subnet master node utilizes signal arrival time differences between a plurality of positioning monitoring nodes receiving the data packet from the same positioning target device, and mutual physical distances between the positioning monitoring nodes, to compute the distance differences of the positioning target device with respect to the plurality of positioning monitoring nodes, and determine a position of the positioning target device in a physical coverage range of the subnet. The present invention may achieve the real-time positioning and monitoring of a large number of targets in a large physical range.
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公开(公告)号:US10817368B2
公开(公告)日:2020-10-27
申请号:US16311419
申请日:2016-08-18
摘要: The present invention discloses a unidirectional bit error correction method for a OTP ROM, comprising: applying error correction encoding to bit information and writing the bit information to the OTP ROM; during power-up initialization, converting hard bit information read out from the OTP ROM to soft bit information; during the power-up initialization, performing error correction decoding through a soft bit decoder. The advantages of the present invention include: utilizing otherwise temporarily idle decoding modules in the chip, without requiring additional hardware resource, while providing stronger error correction capability to the OTP ROM, improving the stability of chip applications, prolonging chip service life, and significantly reducing rejection rate in chip production.
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8.
公开(公告)号:US20190246403A1
公开(公告)日:2019-08-08
申请号:US16318561
申请日:2016-08-18
CPC分类号: H04W72/0466 , H04B1/69 , H04B1/7115 , H04B17/29 , H04J3/0605 , H04L1/00 , H04L1/0061 , H04W28/04 , H04W28/06 , H04W80/08
摘要: The present invention discloses a method for processing a preamble sequence and header for a data packet, comprising the following steps of: using a bit sequence of a fixed pattern to replace a scrambled pseudo-random bit sequence in a SYNC field in the preamble sequence, and spreading the SYNC field by a Barker code; extending a length of a spreading code and spreading an SFD field in the preamble sequence by the extended spreading code; and extending a length of a spreading code and spreading a header field by the extended spreading code. The present invention may significantly improve the performance of reception and detection for the preamble sequence (the SYNC field and the SFD field) and the PLCP header field, better overcome long-distance channel conditions, enhance the signal stability of transmission; and meanwhile the present invention is easy to implement and only requires little modifications to the circuit of a conventional Wi-Fi device.
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公开(公告)号:US11711155B2
公开(公告)日:2023-07-25
申请号:US17612812
申请日:2020-02-26
发明人: Rui Zhan
IPC分类号: H04B17/30 , H04B17/336 , H04B7/0417 , H04B7/0456 , H04L27/34
CPC分类号: H04B17/336 , H04B7/0417 , H04B7/0456 , H04L27/3405
摘要: The present disclosure discloses an adaptive MIMO detection method and system. The method includes the following steps: a) determining whether a Signal to Noise Ratio of a data packet is greater than a set threshold for Signal to Noise Ratio, and if yes, performing ZF preprocessing on the channel matrix, and if not, performing MMSE preprocessing on the channel matrix; b) performing sorted QR decomposition on the channel matrix processed in step a) to obtain a plurality of decomposition matrices; c) determining whether a condition number of the channel matrix of the data packet is greater than a set threshold for condition number of the channel, and if yes, Lattice Reduction is performed on the decomposition matrices obtained in step b); d) determining whether an estimated value of an interference term of the channel matrix is greater than a threshold for the estimated value of the interference term of the channel matrix, and if yes, SIC detection mode is selected for MIMO detection on the data packets, and if not, K-best detection mode is selected for MIMO detection on the data packets; and e) according to processing results from steps a) to d), performing MIMO detection on the data packet.
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公开(公告)号:US11509516B2
公开(公告)日:2022-11-22
申请号:US17434899
申请日:2019-12-03
IPC分类号: H04L27/26 , H04L27/34 , H04B7/0413 , H04L5/00
摘要: A signal detection method for a MIMO-OFDM wireless communication system includes obtaining a channel matrix of each subcarrier for each MIMO-OFDM data packet; receiving a reception vector of each subcarrier; performing MIMO detection for a first OFDM symbol and channel matrix preprocessing to generate a global dynamic K-value table; performing MIMO detection for each subsequent OFDM symbol, the MIMO detection includes: performing the following steps for each subcarrier of a current OFDM symbol: transforming the reception vector of the current subcarrier into a LR search domain; and obtaining a LR domain candidate transmission vector of the current subcarrier, a K-value applied to each search layer of the current subcarrier during the K-best search is a global dynamic K-value in the global dynamic K-value table corresponding to the search layer.
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