公开(公告)号：US11146395B2

公开(公告)日：2021-10-12

申请号：US16152286

申请日：2018-10-04

申请人： Amir Keyvan Khandani

发明人： Amir Keyvan Khandani

IPC分类号： H04L29/06 ,  H04L9/08 ,  G06F21/62

摘要： Embodiments include method for authentication including interacting with a user by a server in real time to collect verification data for authentication by requiring the user to take an action in real time; comparing a detected reaction by the user in response to the requirement to take the action to a predetermined metric; and determining based on the comparison to the predetermined metric, whether to authenticate the user.

公开(公告)号：US11012144B2

公开(公告)日：2021-05-18

申请号：US16248676

申请日：2019-01-15

申请人： Amir Keyvan Khandani

发明人： Amir Keyvan Khandani

IPC分类号： H04B7/155 ,  H04L5/14 ,  H04B1/44 ,  H04B7/00

摘要： A method and system is disclosed for operating an in-band relay to receive and amplify an incoming radio frequency signal and forward the amplified radio frequency signal. Methods to improve isolation between receive and transmit front-ends are disclosed, enabling an increase in the amplification gain without causing oscillation. Methods for learning the impulse response of the self-interference channel, and methods to perform adaptive echo cancellation in the analog domain. In addition, methods for transmit and receive beamforming are presented that achieve two objectives: (1) Improve the signal-to-noise ratio of the relayed signal, thereby compensating for noise amplification. (2) Improve the isolation, thereby enabling to increase the relay gain without causing oscillation.

公开(公告)号：US10700766B2

公开(公告)日：2020-06-30

申请号：US15955439

申请日：2018-04-17

申请人： Amir Keyvan Khandani

发明人： Amir Keyvan Khandani

IPC分类号： H04B7/155 ,  H04B7/08 ,  H04L5/14 ,  H03H7/12 ,  H04W72/04

摘要： The methods and systems for amplify-and-forward (in-band) relaying relate to beamforming techniques including receive and transmit beamforming for reducing self-interference, and improving Signal-to-Noise Ratio (SNR), or Signal to Interference plus Noise Ratio (SINR), of an incoming signal (to be relayed). The incoming signal is amplified and retransmitted simultaneously with the incoming signal, and over the same frequency band as that of an incoming signal.

公开(公告)号：US10601569B2

公开(公告)日：2020-03-24

申请号：US16225064

申请日：2018-12-19

申请人： Amir Keyvan Khandani

发明人： Amir Keyvan Khandani

IPC分类号： H04L5/14 ,  H04B17/336 ,  H04B17/345 ,  H04B17/14

摘要： A method and apparatus for (a) operating a first full-duplex transceiver to exchange radio-frequency signals with a second full-duplex transceiver, (b) determining at the first full-duplex transceiver that a residual self-interference signal exceeds a threshold, (c) in response to the determination that the residual self-interference signal exceeds the threshold, performing a self-training operation.

公开(公告)号：US20190222296A1

公开(公告)日：2019-07-18

申请号：US16248676

申请日：2019-01-15

申请人： Amir Keyvan Khandani

发明人： Amir Keyvan Khandani

IPC分类号： H04B7/155 ,  H04B1/44 ,  H04L5/14

CPC分类号： H04B7/15557 ,  H04B1/44 ,  H04B7/1555 ,  H04L5/1461

摘要： A method and system is disclosed for operating an in-band relay to receive and amplify an incoming radio frequency signal and forward the amplified radio frequency signal. Methods to improve isolation between receive and transmit front-ends are disclosed, enabling an increase in the amplification gain without causing oscillation. Methods for learning the impulse response of the self-interference channel, and methods to perform adaptive echo cancellation in the analog domain. In addition, methods for transmit and receive beamforming are presented that achieve two objectives: (1) Improve the signal-to-noise ratio of the relayed signal, thereby compensating for noise amplification. (2) Improve the isolation, thereby enabling to increase the relay gain without causing oscillation.

公开(公告)号：US10333593B2

公开(公告)日：2019-06-25

申请号：US15585130

申请日：2017-05-02

申请人： Amir Keyvan Khandani

发明人： Amir Keyvan Khandani

IPC分类号： H01Q19/10 ,  H04B7/0426 ,  H01Q9/28 ,  H01Q21/06 ,  H04L5/14 ,  H01Q9/16 ,  H01Q9/30 ,  H01Q9/44 ,  H01Q11/08 ,  H01Q19/13 ,  H01Q19/19 ,  H01Q21/24 ,  H01Q1/36 ,  H01Q19/17 ,  H01Q19/28 ,  H01Q25/00 ,  H01F5/00 ,  H01F17/00 ,  H03M1/74

摘要： Methods and apparatuses are described for communicating primary signals over a high-speed primary channel, the primary signals having a beam pattern having a full lobe at a center of an axis of propagation and communicating auxiliary signals over a low-speed auxiliary channel, the auxiliary signals having a decoupled beam pattern having a null at the center of axis of propagation, the high-speed primary channel and low-speed auxiliary channel operating in full duplex.

公开(公告)号：US20190104121A1

公开(公告)日：2019-04-04

申请号：US16152286

申请日：2018-10-04

申请人： Amir Keyvan Khandani

发明人： Amir Keyvan Khandani

IPC分类号： H04L29/06

摘要： Embodiments include method for authentication including interacting with a user by a server in real time to collect verification data for authentication by requiring the user to take an action in real time; comparing a detected reaction by the user in response to the requirement to take the action to a predetermined metric; and determining based on the comparison to the predetermined metric, whether to authenticate the user.

公开(公告)号：US20180309502A1

公开(公告)日：2018-10-25

申请号：US15955439

申请日：2018-04-17

申请人： Amir Keyvan Khandani

发明人： Amir Keyvan Khandani

IPC分类号： H04B7/155 ,  H04B7/08

CPC分类号： H04B7/15535 ,  H03H7/12 ,  H04B7/0857 ,  H04B7/086 ,  H04B7/15557 ,  H04B7/15578 ,  H04L5/14 ,  H04L5/1461 ,  H04W72/042

摘要： The methods and systems for amplify-and-forward (in-band) relaying relate to beamforming techniques including receive and transmit beamforming for reducing self-interference, and improving Signal-to-Noise Ratio (SNR), or Signal to Interference plus Noise Ratio (SINR), of an incoming signal (to be relayed). The incoming signal is amplified and retransmitted simultaneously with the incoming signal, and over the same frequency band as that of an incoming signal.

公开(公告)号：US10063364B2

公开(公告)日：2018-08-28

申请号：US15334013

申请日：2016-10-25

申请人： Amir Keyvan Khandani

发明人： Amir Keyvan Khandani

IPC分类号： H04L5/14 ,  H04L1/00 ,  H04B1/50 ,  H04B1/525 ,  H04B17/00 ,  H04B1/56 ,  H04B7/0413

CPC分类号： H04L5/1423 ,  H04B1/50 ,  H04B1/525 ,  H04B1/56 ,  H04B7/0413 ,  H04B17/0085 ,  H04L1/0031 ,  H04L5/0048 ,  H04L5/14 ,  H04L5/1461

摘要： A full-duplex transceiver is provided with componentry and methods for cancellation of nonlinear self-interference signals. The transceiver is capable of receiving an incoming radio-frequency signal that includes both a desired radio-frequency signal component and a self-interference component caused by the transceiver's own radio-frequency transmission. The transceiver demodulates the incoming radio-frequency signal to generate a first demodulated signal. The transceiver combines an analog corrective signal with the first demodulated signal to generate a second demodulated signal with reduced self-interference. The transceiver processes the first and second demodulated signals to determine a desired incoming baseband signal and to determine nonlinear components of the self-interference signal, such as nonlinearities introduced by the transceiver's power amplifier.

公开(公告)号：US09997830B2

公开(公告)日：2018-06-12

申请号：US14459257

申请日：2014-08-13

申请人： Amir Keyvan Khandani

发明人： Amir Keyvan Khandani

IPC分类号： H01Q3/46 ,  H01Q19/10 ,  H01Q19/185 ,  H01Q3/00 ,  H01Q19/00

CPC分类号： H01Q3/46 ,  H01Q15/006 ,  H01Q19/108 ,  H01Q19/185

摘要： An antenna assembly includes a first active antenna element and a second active antenna element, each of which may be a dipole. A first set of independently-switchable radio-frequency reflectors are positioned around at least the first active antenna element. These first switchable radio-frequency reflectors may also be positioned around the second active antenna element. Alternatively, a second set of independently-switchable radio-frequency reflectors may be positioned around the second active antenna element. The switchable reflectors enable controlled perturbation of the communication channel between the antenna assembly and a remote communications node, enabling securely encrypted communications.