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11.发明授权High density deployment using transmit or transmit-receive interference suppression with selective channel dimension reduction/attenuation and other parameters 有权使用发射或发射接收干扰抑制的高密度部署，具有选择性的信道尺寸减小/衰减和其他参数公开(公告)号：US08976761B2
公开(公告)日：2015-03-10
申请号：US13645565
申请日：2012-10-05
Applicant: Cisco Technology, Inc.
Inventor： Paul J. Stager , Matthew A. Silverman , Zhigang Gao , John Blosco , Raghuram Rangarajan
IPC: H04W4/00
CPC classification number: H04W72/082 , H04L5/0073 , H04W24/02 , H04W72/0426 , H04W72/046 , H04W84/12 , H04W88/08
Abstract: In a wireless local are network, each of multiple access points, in a high density deployment, are configured to suppress co-channel interference. A first access point having a plurality of antennas beamforms a transmission to a wireless client device within a null-space or with the weakest singular eigenmodes of a wireless channel between the first access point and at least one co-channel second access point. Techniques are presented herein for situations in which any given access point has two or more co-channel access points. In addition, an access point may perform receive side suppression with respect to a transmission (made by a co-channel access point to one of its associated wireless client devices) that is received from that co-channel access point.
Abstract translation: 在无线本地是网络中，以高密度部署的多个接入点中的每一个被配置为抑制同信道干扰。 具有多个天线的第一接入点波束在零空间内或在第一接入点与至少一个同频道第二接入点之间的无线信道的最弱奇异本征模式中形成向无线客户端设备的传输。 本文给出了任何给定接入点具有两个或更多个同频道接入点的情况的技术。 此外，接入点可以针对从该同频道接入点接收到的传输（由与其相关联的无线客户端设备之一的同频道接入点进行的）进行接收侧抑制。
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12.发明授权公开(公告)号：US11621798B2
公开(公告)日：2023-04-04
申请号：US17389824
申请日：2021-07-30
Applicant: Cisco Technology, Inc.
Inventor： Brian Hart , Zhigang Gao
IPC: H04L1/00
Abstract: Preamble puncturing configuration information is encoded in a pad field, and alternatively or additionally, in a Service Field, depending on a transmission bandwidth of a Physical Layer Convergence Protocol (PLCP) Protocol Data Unit (PPDU). Some implementations also encode one or more parity bits in the pad field or Service field. The PPDU including the preamble puncturing configuration information encodes, in various embodiments, a request to send frame, a clear to send frame, a power save poll frame, or a contention free end frame.
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公开(公告)号：US11460534B2
公开(公告)日：2022-10-04
申请号：US16748704
申请日：2020-01-21
Applicant: Cisco Technology, Inc.
Inventor： Zhigang Gao , Matthew A. Silverman , Paul J. Stager , Huaiyi Wang
Abstract: Embodiments herein describe performing AoA resolving to identify a plurality of AoAs corresponding to a multipath signal and then using AP voting to identify a location of the client device. AoA resolving enables an AP to identify the different angles at which a multipath signal reaches the AP. That is, due to reflections, a wireless signal transmitted by a single client device may reach the AP using multiple paths that each has their own AoA. The AP can perform AoA resolving to identify the AoAs for the different paths in a multipath signal. In one embodiment, the AoAs for two APs (or a subset of the APs) can be used to identify cross points or intersection points that represent candidate locations of the client device. A voting module can determine whether those cross points corresponds to AoAs identified by the remaining APs.
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公开(公告)号：US11374704B2
公开(公告)日：2022-06-28
申请号：US16869311
申请日：2020-05-07
Applicant: Cisco Technology, Inc.
Inventor： Huaiyi Wang , Brian D. Hart , Matthew A. Silverman , Zhigang Gao
Abstract: Aspects described herein include a method comprising predicting, based on one or more transmission characteristics, error values for a sequence of bit positions used for modulating data within a packet. The method further comprises generating a bitmap that maps one or more payload bits and one or more padding bits of the packet to respective bit positions of the sequence. The one or more padding bits are preferentially mapped to respective bit positions having relatively greater error values. The method further comprises modulating the sequence according to the bitmap.
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公开(公告)号：US10524272B2
公开(公告)日：2019-12-31
申请号：US15865877
申请日：2018-01-09
Applicant: Cisco Technology, Inc.
Inventor： Matt Silverman , Zhigang Gao , Oscar Bejarano Chavez , John Matthew Swartz , Santosh Ghanshyam Pandey
Abstract: In one embodiment, a control device associated with a wireless network of a given location determines a reference quality of location readings between access points and client devices based on using substantially all of an available wireless communication bandwidth. The control device may then determine channel state information (CSI) between the client devices and access points for each orthogonal frequency-division multiple access (OFDMA) resource unit (RU), and selects a subset of RUs for allocation to each respective client device, based on the subset of RUs allocated to each respective client device i) surpassing a determined threshold of certain parameters of the CSI, while also ii) providing a minimum quality of a location reading based on using only the subset of RUs as compared to the reference quality of location readings. The control device may then allocate the selected subset of RUs to each respective client device for location-preserving OFDMA-signaling-based communication.
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Patent Agency Ranking
公开(公告)号：US09143370B2
公开(公告)日：2015-09-22
申请号：US14037807
申请日：2013-09-26
Applicant: Cisco Technology, Inc.
Inventor： Zhigang Gao , Raghuram Rangarajan , David Kloper
CPC classification number: H04L25/063
Abstract: Techniques are presented herein for distinguishing between the DC component of a real signal and DC energy of a received signal due to the radio receiver circuitry. Samples are obtained of a received signal derived from output of a receiver of a communication device. A mean of the samples is computed over a sample window comprising a predetermined number of samples. First and second thresholds are provided, the first threshold being greater than the second threshold. An absolute value of the mean is compared with respect to the first threshold and the second threshold as samples are obtained in the sample window. A selection is made between the first threshold and the second threshold for purposes of comparison with the absolute value of the mean to determine whether energy at DC is a true/real DC component of the received signal or is due to circuitry of the receiver.
Abstract translation: 这里给出了用于区分由无线电接收器电路引起的实际信号的DC分量和接收信号的DC能量之间的技术。 获得从通信设备的接收机的输出得到的接收信号的样本。 在包含预定数量的样本的样本窗口上计算样本的平均值。 提供第一和第二阈值，第一阈值大于第二阈值。 将平均值的绝对值相对于第一阈值和第二阈值进行比较，因为样本窗口中获取样本。 在第一阈值和第二阈值之间进行选择，以便与平均值的绝对值进行比较，以确定DC处的能量是否是接收信号的真实/真实DC分量，或者是由于接收机的电路。
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17.发明授权公开(公告)号：US11916670B2
公开(公告)日：2024-02-27
申请号：US18171760
申请日：2023-02-21
Applicant: Cisco Technology, Inc.
Inventor： Brian Hart , Zhigang Gao
IPC: H04L1/00
CPC classification number: H04L1/0068
Abstract: Preamble puncturing configuration information is encoded in a pad field, and alternatively or additionally, in a Service Field, depending on a transmission bandwidth of a Physical Layer Convergence Protocol (PLCP) Protocol Data Unit (PPDU). Some implementations also encode one or more parity bits in the pad field or Service field. The PPDU including the preamble puncturing configuration information encodes, in various embodiments, a request to send frame, a clear to send frame, a power save poll frame, or a contention free end frame.
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公开(公告)号：US11714154B2
公开(公告)日：2023-08-01
申请号：US16867410
申请日：2020-05-05
Applicant: Cisco Technology, Inc.
Inventor： Zhigang Gao , Matthew A. Silverman , Fred J. Anderson , Huaiyi Wang
CPC classification number: G01S3/143 , G01S3/74 , G01S5/0284
Abstract: Techniques for determining a location of a client device using recursive phase vector subspace estimation are described. One technique includes receiving a plurality of angle-of-arrival (AoA) measurements from a plurality of access points (APs). Each AoA measurement includes a plurality of entries for phase values measured from a signal received from a client device at the plurality of APs. At least one AoA measurement of the plurality of AoA measurements that includes at least one of: (i) one or more entries with missing phase values and (ii) one or more entries with erroneous phase values is identified, based on a recursive phase estimation. The plurality of AoA measurements are updated based on the identified at least one AoA measurement. The location of the client device is determined, based on the updated plurality of AoA measurements.
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19.发明申请公开(公告)号：US20220247515A1
公开(公告)日：2022-08-04
申请号：US17389824
申请日：2021-07-30
Applicant: Cisco Technology, Inc.
Inventor： Brian Hart , Zhigang Gao
IPC: H04L1/00
Abstract: Preamble puncturing configuration information is encoded in a pad field, and alternatively or additionally, in a Service Field, depending on a transmission bandwidth of a Physical Layer Convergence Protocol (PLCP) Protocol Data Unit (PPDU). Some implementations also encode one or more parity bits in the pad field or Service field. The PPDU including the preamble puncturing configuration information encodes, in various embodiments, a request to send frame, a clear to send frame, a power save poll frame, or a contention free end frame.
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公开(公告)号：US20210075534A1
公开(公告)日：2021-03-11
申请号：US16562598
申请日：2019-09-06
Applicant: Cisco Technology Inc.
Inventor： Huaiyi Wang , Matthew Aaron Silverman , Zhigang Gao , Evgeny Yankevich
Abstract: A wireless node in a wireless communication network. The wireless node includes one or more interfaces configured to receive wireless transmissions, a memory comprising instructions, and a hardware processor. The wireless node samples a received wireless transmission into a plurality of time-based subdivisions. for each subdivision of the wireless transmission the wireless node determines a cross-correlation between the subdivision and a local syncword. The local syncword is constructed to correlate to any primary synchronization signal, PSS, of a plurality of PSSs defined for synchronization in the wireless network. The wireless node, based on the cross-correlation, determines whether one PSS of the plurality of PSSs is present in the subdivision of the wireless transmission.
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