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21.发明授权公开(公告)号：US11729716B2
公开(公告)日：2023-08-15
申请号：US15928514
申请日：2018-03-22
Applicant: MEDIATEK INC.
Inventor： Jianhan Liu , Po-Yuen Cheng , Thomas Edward Pare, Jr.
CPC classification number: H04W52/0229 , H04L27/04 , H04W52/0235 , H04W84/12 , Y02D30/70
Abstract: Systems and methods of transmitting and receiving a Wake-Up Radio (WUR) packet by using a simplified preamble structure that contains no training field. The preamble carries a signature sequence selected from a set of predefined sequences, each corresponding to a different data transmission rate. The preamble and the control information of the WUR packet are transmitted in the same rate as indicated by the selected sequence. Hence, a receiving WUR can determine the data transmission rate and locate the associated control information directly if a sequence that matches a predefined signature sequence is detected. The same sequence or in combination with an additional sequence in the preamble may also be used to indicate automatic gain control synchronization, packet type and other related information.
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公开(公告)号：US10484814B2
公开(公告)日：2019-11-19
申请号：US15121049
申请日：2015-02-24
Applicant: MEDIATEK INC.
Inventor： James June-Ming Wang , Jianhan Liu , Thomas Edward Pare, Jr. , Tianyu Wu , Gabor Bajko , Yung-Ping Hsu
IPC: H04W4/021 , H04W64/00 , G01S5/02 , G01S5/06 , H04W4/02 , H04W24/10 , H04L5/00 , G01S5/12 , G01S3/14 , G01S3/74 , G01S13/82 , H04W4/33 , G01S1/08 , H04W84/12 , H04W4/04
Abstract: A method of combined direction finding (DF) and fine timing measurement (FTM) positioning in a wireless location area network (WLAN) is proposed. A multiple antenna IEEE 802.11 transmitting device (AP) can transmit signal preamble containing multiple Long Training Field (LTF) symbols in a radio frame from multiple antennas, which allows a receiving device (STA) to resolve multiple DF sounding signals transmitted from the multiple antennas and thereby estimating angle of departure (AoD). On the other hand, the AP can estimate angle of arrival (AoA) from radio signals transmitted from the STA. When the radial resolution error of AoD or AoA positioning increases, DF positioning and fine-timing measurement (FTM) ranging can be jointly applied to reduce the radial resolution error and extends the AoD/AoA service area with positing accuracy.
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公开(公告)号：US10470125B2
公开(公告)日：2019-11-05
申请号：US15852548
申请日：2017-12-22
Applicant: MEDIATEK INC.
Inventor： Jianhan Liu , Thomas Edward Pare, Jr. , Keng Leong Fong
Abstract: Systems and methods of transmitting a multi-user (MU) wake-up packet in WLAN including wake-up signals to activate main radios on multiple communication devices via the wake-up radios (WURs). In the multi-user wake-up packet, a frequency channel can be divided into several sub-channels for transmitting multiple wake-up signals in FDMA. Each wake-up signal is modulated in ON/OFF Key modulation. Two adjacent wake-up signals are adequately spaced apart by a certain frequency spacing to reduce adjacent channel interferences. Once a WUR on a receive device receives the packet, it generates a wake-up indication to wake up the main radio for active data communication. The MU wake-up packet may also include a sequence of multiple wake-up signals transmitted using the same sub-channel and cascaded in a time-domain. A reconfiguration window may be inserted between consecutive wake-up signals on the same sub-channel, and between a legacy preamble and the following wakeup signals.
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公开(公告)号：US10405139B2
公开(公告)日：2019-09-03
申请号：US15470000
申请日：2017-03-27
Applicant: MediaTek Inc.
Inventor： Chuen-Shen Bernard Shung , Jianhan Liu , George Chien , YungPing Hsu , Yasantha Rajakarunanayake , Dingchung Jann , Tom Hsiou-Cheng Kao
IPC: H04W4/02 , H04W4/90 , H04W56/00 , H04W52/02 , H04W72/04 , H04L5/00 , G08B3/10 , G08B25/01 , H04W84/12 , G08B21/02
Abstract: An emergency mode is provided in a portable electronic device for locating a survivor in a disaster. The device includes a wireless antenna to transmit and receive wireless signals; a memory to store one or more identifiers; a user interface to receive a command that enables the emergency mode. The device also includes one or more processors, which, in response to the command, detect via the wireless receiver a predetermined identifier that matches a stored identifier identifying a sender of the predetermined identifier as a trusted node. When the predetermined identifier and a timing measurement frame are received from the trusted node, the device sends a response to the trusted node to indicate its presence.
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公开(公告)号：US10225122B2
公开(公告)日：2019-03-05
申请号：US15422755
申请日：2017-02-02
Applicant: MEDIATEK INC.
Inventor： Gary A. Anwyl , Jianhan Liu , Tianyu Wu , Thomas Edward Pare, Jr.
Abstract: Dual sub-carrier modulation (DCM) is introduced in high efficiency (HE) WLAN. DCM is a solution to deal with narrow band interferences and for range extension. DCM can introduce frequency diversity into OFDM systems by transmitting the same information on two subcarriers separated in frequency. If DCM is applied, then the transmitter modulates the same encoded bits onto two separated subcarriers with the same or different constellation mapping schemes. DCM suffers from a high peak-to-average power ratio (PAPR). In accordance with one novel aspect, a method of transmitting and encoding a HE PPDU frame with binary phase shift keying (BPSK) DCM and lower PAPR is proposed.
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Patent Agency Ranking
26.发明授权公开(公告)号：US10003488B2
公开(公告)日：2018-06-19
申请号：US15060624
申请日：2016-03-04
Applicant: MEDIATEK INC.
Inventor： Chien-Fang Hsu , Jianhan Liu
CPC classification number: H04L27/2666 , H04L27/0012 , H04L27/2613
Abstract: The present invention provides a method and an electronic apparatus for automatically detecting bandwidth and the packet type of a packet, so as to solve the problem mentioned above. The method comprises: detecting a plurality of symbols in the preamble of the packet; generating a sign pattern according to the symbols; and determining the bandwidth and the packet type of the packet according to the detected sign pattern. The electronic apparatus comprises: a symbol detecting circuit, a sign pattern generating circuit, and a determining circuit. The symbol detecting circuit is utilized for detecting a plurality of symbols in the preamble of the packet. The sign pattern generating circuit is utilized for generating a sign pattern according to the symbols. The determining circuit is utilized for determining the bandwidth and the packet type of the packet according to the detected sign pattern.
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公开(公告)号：US20170104553A1
公开(公告)日：2017-04-13
申请号：US15290135
申请日：2016-10-11
Applicant: MEDIATEK INC.
Inventor： Jianhan Liu , Shengquan Hu , Tianyu Wu , Thomas Edward PARE, JR.
CPC classification number: H04L1/0041 , H04L27/0008 , H04L27/2601 , H04L27/2613 , H04L27/2626 , H04W72/0453 , H04W84/12
Abstract: A new lower density parity check (LDPC) tone mapper is proposed when DCM is applied for a given resource unit (RU) when LDPC is used as the channel control coding. For HE PPDU transmission with DCM, LDPC encoded streams are first modulated by a DCM constellation mapper. The modulated symbols of the lower half of the frequency segment and the modulated symbols of the upper half of the frequency segment are modulated using the same LDPC encoded bits using DCM mapping. The modulated symbols of the lower half of the frequency segment are mapped to lower half of the data subcarriers using DCM LDPC tone mapper. The modulated symbols of the upper half of the frequency segment are mapped to upper half of the data subcarriers using the same DCM LDPC tone mapper. Maximum frequency diversity for DCM can be achieved.
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公开(公告)号：US20170070893A1
公开(公告)日：2017-03-09
申请号：US15121044
申请日：2015-02-24
Applicant: James June-Ming Wang , Jianhan Liu , Thomas Edward Pare, JR. , Tianyu Wu , Gabor Bajko , Yung-Ping Hsu , MEDIATEK INC.
Inventor： James June-Ming Wang , Jianhan Liu , Thomas Edward Pare Jr. , Tianyu Wu , Gabor Bajko , Yung-Ping Hsu
CPC classification number: H04W16/225 , G01S3/14 , G01S3/74 , G01S5/0252 , G01S5/06 , G01S5/12 , G01S13/825 , H04B7/0617 , H04B17/318 , H04L5/0048 , H04L5/005 , H04L69/22 , H04W4/02 , H04W4/023 , H04W4/043 , H04W24/10 , H04W64/00 , H04W84/12
Abstract: A method of direction finding (DF) positioning in a wireless location area network (WLAN) is proposed. A multiple antenna IEEE 802.11 transmitting device can transmit signal preamble containing multiple Long Training Field (LTF) symbols in a radio frame from multiple antennas simultaneously, which allows a receiving device to resolve multiple DF sounding signals transmitted from the multiple antennas. As a result, angle of departure (AoD) of the transmitting device can be estimated by using the multiple resolved DF sounding signals from each antenna for DF positioning purpose.
Abstract translation: 提出了一种在无线定位区域网络（WLAN）中的方向搜索（DF）定位的方法。 多天线IEEE 802.11发射设备可以同时在多个天线的无线帧中发送包含多个长训练场（LTF）符号的信号前导码，这允许接收设备解析从多个天线发送的多个DF探测信号。 结果，可以通过使用来自每个天线的多个分辨的DF探测信号来估计发射装置的出发角（AoD），用于DF定位目的。
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公开(公告)号：US20160353275A1
公开(公告)日：2016-12-01
申请号：US15117448
申请日：2015-02-10
Applicant: Jianhan Liu , Tianyu Wu , Thomas Edward Pare Jr. , MEDIATEK INC.
Inventor： Jianhan Liu , Tianyu Wu , Thomas Edward Pare Jr.
IPC: H04W8/26 , H04L12/823 , H04W48/16
Abstract: A method for identifying source BSS in WLAN is proposed. A high efficiency (HE) access point (AP) sends a packet containing a basic service set (BSS) color to a HE station. The HE AP also sends a packet containing an assigned association identification (AID) to a very high throughput (VHT) station. The assigned AID comprises at least part of the BSS color information. The VHT station therefore sends a packet containing the at least part of the BSS color information such that any AP or station that receives the packet can determine the BSS the VHT station is in.
Abstract translation: 提出了一种识别WLAN中源BSS的方法。 高效（HE）接入点（AP）向HE站发送包含基本服务集（BSS）颜色的分组。 HE AP还将包含分配的关联标识（AID）的分组发送到非常高的吞吐量（VHT）站。 分配的AID包括BSS颜色信息的至少一部分。 因此，VHT站发送包含BSS颜色信息的至少一部分的分组，使得接收分组的任何AP或站可以确定VHT站所在的BSS。
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30.发明申请公开(公告)号：US20160352552A1
公开(公告)日：2016-12-01
申请号：US15164690
申请日：2016-05-25
Applicant: MEDIATEK INC.
Inventor： Jianhan Liu , Tianyu Wu , Thomas Edward PARE, JR. , YungPing Hsu
IPC: H04L27/26 , H04L5/00 , H04B1/7176
Abstract: Modulation schemes that use dual sub-carrier to reliably transmit physical layer related signaling information and/or data in high efficiency wireless local area network (HE WLAN) are proposed. The proposed schemes can be implemented with low complexity and provide better performance than existing modulation schemes used in WLAN that are based on IEEE 802.11/a/b/g/n/ac standards. The proposed schemes enhance the reliability of transmissions, especially under narrow band interferences. In accordance with a novel aspect, dual subcarrier modulation (DCM) is introduced in HE WLAN. DCM can introduce frequency diversity into OFDM systems by transmitting the same information on two subcarriers separated in frequency. A DCM indication scheme is used such that both encoding and decoding of DCM is really simple.
Abstract translation: 提出了使用双子载波在高效率无线局域网（HE WLAN）中可靠传输物理层相关信令信息和/或数据的调制方案。 所提出的方案可以以低复杂度实现，并且比基于IEEE 802.11 / a / b / g / n / ac标准的WLAN中使用的现有调制方案提供更好的性能。 所提出的方案增强了传输的可靠性，特别是在窄带干扰下。 根据一个新颖的方面，在HE WLAN中引入了双副载波调制（DCM）。 DCM可以通过在频率上分离的两个子载波上发送相同的信息来将频率分集引入OFDM系统。 使用DCM指示方案，使得DCM的编码和解码都非常简单。
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