公开(公告)号：US10708086B2

公开(公告)日：2020-07-07

申请号：US15409261

申请日：2017-01-18

Applicant: NATIONAL INSTRUMENTS CORPORATION

Inventor： Malik Muhammad Usman Gul ,  Ahsan Aziz ,  James Wesley McCoy

IPC: H04L25/02 ,  H04W56/00 ,  H04J13/00 ,  H04L25/03

Abstract: Techniques are disclosed relating to channel sounding. In some embodiments a transmitter transmits a periodic CAZAC sequence beginning at a point in time that corresponds to a timing signal (e.g., a pulse-per-second signal). In some embodiments, a receiver waits to begin processing received sequences for a time interval corresponding to the length of the CAZAC sequence, where the time interval begins at the same time as the timing signal. This may avoid a need for timing synchronization prior to processing, reduce processing and latency in receiver implementations, and may allow determination of a TOA as well as a channel impulse response estimate by correlating a received cyclically-shifted CAZAC sequence with a local version of the transmitted CAZAC sequence.

公开(公告)号：US20180159637A1

公开(公告)日：2018-06-07

申请号：US15821473

申请日：2017-11-22

Applicant: NATIONAL INSTRUMENTS CORPORATION

Inventor： Tanim Mohammed Abu Taher ,  Ahsan Aziz ,  James W. McCoy

IPC: H04B17/12 ,  H04L25/03 ,  H04B7/0413

CPC classification number: H04B17/12 ,  H04B7/0413 ,  H04B17/14 ,  H04B17/21 ,  H04L25/0202 ,  H04L25/03012 ,  H04L25/03159 ,  H04L25/03891

Abstract: Techniques are disclosed related to calibrating and operating a multiple input multiple output (MIMO) radio system. In some embodiments, a dual mode calibration may be employed to calibrate a remote transmitter (RT). During a first, Sparse Full System Calibration (SFSC) mode, the RT may be physically connected to the MIMO radio system. In some embodiments, first and second equalizers may be derived for each of the RT and a local transmitter (LT), respectively. During a subsequent, Real-time Calibration (RTC) mode, the RT may be located remotely from the MIMO radio system, and the RT may be configured to communicate with the MIMO radio system over the air via an antenna. In the RTC mode, third equalizers may be derived for the LT. The RT may then be calibrated based on an equalizer that is derived from each of the first, second, and third equalizers. As one non-limiting example, the techniques described herein may enable real-time calibration for the RT even while the RT is located remotely from the MIMO radio system. In different embodiments, the calibration may be achieved by deriving either fractionally spaced frequency domain equalizers, or time domain equalizers.

公开(公告)号：US09477386B2

公开(公告)日：2016-10-25

申请号：US14257944

申请日：2014-04-21

Applicant: NATIONAL INSTRUMENTS CORPORATION

Inventor： Yong Rao ,  Ahsan Aziz ,  James W. McCoy

IPC: H03M1/00 ,  G06F3/0484 ,  H03K19/177 ,  H03K19/173 ,  G06F3/0481 ,  H03M1/12

CPC classification number: G06F3/04842 ,  G06F3/04817 ,  H03K19/1733 ,  H03K19/17748 ,  H03M1/1215

Abstract: Various embodiments of methods and associated devices for increasing throughput in a programmable hardware element using interleaved data converters are disclosed. A device comprising a programmable hardware element may be configured to comprise a plurality N of processing portions. The device may receive an input signal, and sample the signal in an interleaved fashion, on a per sample basis, at an effective rate K, to produce N parallel data streams. The N parallel data streams may be processed in parallel by the plurality N of processing portions. Outputs of the plurality N of processing portions may be combined to produce output data. The effective rate K and/or the number N of parallel data streams may be specified by user input. Alternatively, these values may be determined automatically. For example, the effective rate K may be determined automatically based on a bandwidth of the input signal.

Abstract translation: 公开了用于增加使用交错数据转换器的可编程硬件元件中的吞吐量的方法和相关装置的各种实施例。 包括可编程硬件元件的装置可以被配置为包括多个N个处理部分。 设备可以接收输入信号，并且以有效速率K以每个采样的方式以交织的方式对信号进行采样，以产生N个并行数据流。 N个并行数据流可以由多个处理部分并行处理。 可以组合多个N个处理部分的输出以产生输出数据。 并行数据流的有效速率K和/或数量N可以由用户输入来指定。 或者，可以自动确定这些值。 例如，可以基于输入信号的带宽自动确定有效速率K.

公开(公告)号：US20210111779A1

公开(公告)日：2021-04-15

申请号：US16600495

申请日：2019-10-12

Applicant: National Instruments Corporation

Inventor： Nikhil U. Kundargi ,  Venkata Siva Santosh Ganji ,  Ahsan Aziz ,  James Wesley McCoy

IPC: H04B7/06 ,  H04B17/318 ,  H04W80/02 ,  H04W72/04 ,  H04W24/10 ,  H04B17/336

Abstract: A UE determines a beam coherence interval metric that is a measure of stability of a beam pair over time based on a set of beam coherence intervals measured by the UE. The beam pair comprises a UE receive beam and a base station transmit beam. A beam coherence interval comprises a time duration within which a quality of a signal received on the UE receive beam remains within one of a plurality of signal quality bins. The UE reports the metric to the base station. The base station may update beam management resource and reporting configurations to the UE based on the metric. The UE may also use the metric to determine a hysteresis value useable by the UE to decide to switch from an active receive beam to a different receive beam having a higher signal quality by at least the hysteresis value.

公开(公告)号：US10790915B2

公开(公告)日：2020-09-29

申请号：US16179578

申请日：2018-11-02

Applicant: NATIONAL INSTRUMENTS CORPORATION

Inventor： Marcus K. DaSilva ,  Chen Chang ,  Charles G. Schroeder ,  Ahsan Aziz ,  Paramjit S. Banwait

IPC: H04B17/17 ,  H04B17/336 ,  H01Q3/26 ,  G01R1/04 ,  G01R31/28 ,  H04B17/27 ,  G01R31/319 ,  H04B17/12

Abstract: Various embodiments are presented of a system and method for testing (e.g., rapidly and cheaply) devices with antennas configured for radio frequency (RF) and/or millimeter wave (mmW) transmission and/or reception. A device to be tested (e.g., the device under test (DUT)) may be mounted to an interface in a measurement fixture (e.g., a socket, anechoic chamber, etc.). Power and data connections of the DUT may be tested over the interface, which may also provide connections for input/output signals, power, and control and may also provide positioning. RF characteristics (e.g., including transmission, reception, and/or beamforming) of the DUT may be tested over-the-air using an array of antennas or probes.

公开(公告)号：US20180159669A1

公开(公告)日：2018-06-07

申请号：US15886587

申请日：2018-02-01

Applicant: NATIONAL INSTRUMENTS CORPORATION

Inventor： MinKeun Chung ,  Jaeweon Kim ,  James W. McCoy ,  Ahsan Aziz

IPC: H04L5/00 ,  H04L5/14 ,  H04W72/08 ,  H04W72/04

CPC classification number: H04L5/006 ,  H04L1/0003 ,  H04L1/0026 ,  H04L1/0028 ,  H04L5/14 ,  H04L5/1461 ,  H04W72/0406 ,  H04W72/082

Abstract: Techniques are disclosed relating to channel quality reporting for full-duplex (FD) wireless communications. In some embodiments an apparatus (e.g., a mobile device) is configured to receive a reference signal in a wireless communication and determine one or more signal quality indicators for FD communications based on a measured SINR of the reference signal and one or more self-interference cancelation levels. The apparatus may determine the one or more self-interference cancelation levels based on the transmit power of signals transmitted by the apparatus and residual power after SIC. The SIC levels may include both analog and digital SIC levels, which may be separately determined. One or more modulation and coding schemes may be determined based on the effective SINR. In some embodiments, multiple effective SINRs are determined for multiple different transmission modulation orders used by the apparatus.

公开(公告)号：US20170207931A1

公开(公告)日：2017-07-20

申请号：US15409261

申请日：2017-01-18

Applicant: NATIONAL INSTRUMENTS CORPORATION

Inventor： Malik Muhammad Usman Gul ,  Ahsan Aziz ,  James Wesley McCoy

IPC: H04L25/02 ,  H04W56/00 ,  H04J13/00

Abstract: Techniques are disclosed relating to channel sounding. In some embodiments a transmitter transmits a periodic CAZAC sequence beginning at a point in time that corresponds to a timing signal (e.g., a pulse-per-second signal). In some embodiments, a receiver waits to begin processing received sequences for a time interval corresponding to the length of the CAZAC sequence, where the time interval begins at the same time as the timing signal. This may avoid a need for timing synchronization prior to processing, reduce processing and latency in receiver implementations, and may allow determination of a TOA as well as a channel impulse response estimate by correlating a received cyclically-shifted CAZAC sequence with a local version of the transmitted CAZAC sequence.

公开(公告)号：US20150305029A1

公开(公告)日：2015-10-22

申请号：US14691339

申请日：2015-04-20

Applicant: NATIONAL INSTRUMENTS CORPORATION

Inventor： Yong Rao ,  Ahsan Aziz ,  Eckhard Ohlmer ,  James W. McCoy

IPC: H04W72/04 ,  H04L5/22

CPC classification number: H04L5/22 ,  H04B7/2656 ,  H04L1/00 ,  H04L5/14 ,  H04W72/1242

Abstract: A flexible real-time scheduler for a wireless communication node, enabling the node to communicate with a remote node using dynamically variable frame structure. The scheduler continuously receives map information defining the frame structure of frames in a frame sequence. Each frame includes a plurality of slots (e.g., time slots or frequency slots). The map information specifies for each slot of each frame whether the slot is to be a transmit slot or a receive slot. The scheduler drives a transmitter to transmit during the slots assigned for transmission, and drives a receiver to receive during the slots assigned for reception. (The number of slots per frame and the size of each slot are also configurable.)

Abstract translation: 用于无线通信节点的灵活的实时调度器，使节点能够使用动态可变的帧结构与远程节点进行通信。 调度器连续地接收定义帧序列中的帧的帧结构的映射信息。 每个帧包括多个时隙（例如，时隙或频率时隙）。 映射信息为每个帧的每个时隙指定时隙是发送时隙还是接收时隙。 调度器驱动发射机在分配用于传输的时隙期间进行传输，并且在分配给接收的时隙期间驱动接收机接收接收机。 （每帧的插槽数量和每个插槽的大小也可以配置。）

公开(公告)号：US11178628B2

公开(公告)日：2021-11-16

申请号：US16671101

申请日：2019-10-31

Applicant: National Instruments Corporation

Inventor： Nikhil U. Kundargi ,  Venkata Siva Santosh Ganji ,  Ahsan Aziz ,  James Wesley McCoy

IPC: H04B7/00 ,  H04W56/00 ,  H04B7/08 ,  H04W72/04 ,  H04L27/26 ,  H04L5/00

Abstract: A user equipment device (UE) reduces receive beam selection time. An antenna array forms receive beams to receive synchronization signal blocks (SSBs) transmitted by a base station (BS). Each SSB comprises OFDM symbols. Each SSB includes a BS-assigned index. The receive beams are switched in time such that, for each SSB, two or more of the receive beams are used to receive corresponding two or more mutually exclusive sets each having at least one but less than all of the OFDM symbols of the SSB. A processor is programmed to, for each receive beam/SSB index pair, measure a signal quality based on the at least one but less than all of the OFDM symbols of the indexed SSB received by the receive beam of the pair. The processor uses the measured signal qualities to select one of the receive beams to use to receive subsequent communications from the BS.

公开(公告)号：US20210136703A1

公开(公告)日：2021-05-06

申请号：US16671101

申请日：2019-10-31

Applicant: National Instruments Corporation

Inventor： Nikhil U. Kundargi ,  Venkata Siva Santosh Ganji ,  Ahsan Aziz ,  James Wesley McCoy

IPC: H04W56/00 ,  H04B7/08 ,  H04L5/00 ,  H04L27/26 ,  H04W72/04

Abstract: A user equipment device (UE) reduces receive beam selection time. An antenna array forms receive beams to receive synchronization signal blocks (SSBs) transmitted by a base station (BS). Each SSB comprises OFDM symbols. Each SSB includes a BS-assigned index. The receive beams are switched in time such that, for each SSB, two or more of the receive beams are used to receive corresponding two or more mutually exclusive sets each having at least one but less than all of the OFDM symbols of the SSB. A processor is programmed to, for each receive beam/SSB index pair, measure a signal quality based on the at least one but less than all of the OFDM symbols of the indexed SSB received by the receive beam of the pair. The processor uses the measured signal qualities to select one of the receive beams to use to receive subsequent communications from the BS.