公开(公告)号：US20250085388A1

公开(公告)日：2025-03-13

申请号：US18244825

申请日：2023-09-11

Applicant: Amazon Technologies, Inc.

Inventor： Durga Laxmi Narayana Swamy Inti ,  Maqsood Ahamed Abdul Careem ,  Ravi Ichapurapu ,  Shruti Makharia

IPC: G01S7/35 ,  G01S7/00 ,  G01S13/536 ,  G01S13/56

Abstract: Technologies directed to providing a wireless chipset with integrated radar for presence detection and localization for natural and ambient interactions with a device are described. A wireless device can send via a first antenna, a set of chirps in a first portion of a frame. The wireless device can receive, via a second antenna, reflected signals corresponding to the set of chirps, and generate in-phase and quadrature (IQ) samples. The wireless device sends (or receives), data in a second portion of the frame to (or from) a second device. The wireless device generates, using RF signals sent or received by the wireless device, channel state information (CSI) data representing channel properties of a channel. The wireless device can determine, using the IQ samples and the CSI data, that an environment in which the wireless device is located has been disrupted by a presence or motion of a person.

公开(公告)号：US11438786B1

公开(公告)日：2022-09-06

申请号：US16009950

申请日：2018-06-15

Applicant: AMAZON TECHNOLOGIES, INC.

Inventor： Rongsheng Huang ,  Ravi Ichapurapu ,  Morris Yuanhsiang Hsu ,  Vipul Jain ,  Jungtao Liu

IPC: H04W28/02 ,  H04L43/10 ,  H04W40/12 ,  G06F3/16 ,  H04L45/12 ,  H04W84/12

Abstract: A group of devices connected on a wireless local area network (WLAN) operate in conjunction with one another to present content. Devices in the group may be wirelessly connected via personal area network (PAN) to other devices, such as speakers. An election process is used to select a primary device. The primary device may receive content from an external source, such as a server, and distribute that content to other devices within the group via the WLAN. The parameters of that distribution, such as a content rate indicative of a bitrate of the content, transfer limit rate, and so forth are configured to preserve fidelity of the presentation while minimizing interruptions to presentation that may result due to frequency contention between the WLAN and the PAN, traffic on the WLAN, and so forth.

公开(公告)号：US10574316B1

公开(公告)日：2020-02-25

申请号：US15987684

申请日：2018-05-23

Applicant: Amazon Technologies, Inc.

Inventor： Ravi Ichapurapu ,  Shao-Cheng Wang ,  Vipul Jain ,  Kun Ting Tsai ,  Milos Jorgovanovic ,  Chirag Saurabh Bhavsar ,  Vinay Gotnakodlu Hegde

IPC: H04B7/06 ,  H04W4/80 ,  H04W8/00 ,  H04B17/318 ,  H04W84/12

Abstract: A device includes a first radio controller, a second radio controller, and a processor. The processor is configured to execute instructions for determining that a first signal strength of a signal received from a remote device by a first antenna electrically connected to the first radio controller is less than a minimum signal strength threshold for communications using the first antenna, identifying a network process configured to communicate with a remote device using the first radio controller or the second radio controller, and determining that the processor is not executing the network process. The processor is further configured to execute instructions for, determining a second signal strength of a second signal received from the remote device by a second antenna, determining the second signal strength is greater than the first signal strength, and causing the first radio controller to communicate using the second antenna.

公开(公告)号：US10348358B1

公开(公告)日：2019-07-09

申请号：US15985289

申请日：2018-05-21

Applicant: Amazon Technologies, Inc.

Inventor： Sameet Ramakrishnan ,  Ravi Ichapurapu ,  Milos Jorgovanovic

IPC: H03F3/19 ,  H04B1/04 ,  H04B1/58

Abstract: This disclosure describes techniques for implementing and utilizing a transceiver in a communication device that has two separate radio-frequency (RF) power amplifiers that are optimized to transmit signals using separate communication standards. The power amplifiers may be designed to convert a lower-power RF signal into different higher-power signals according to different standard-mandated, output-power limits. In this way, a communication device may arbitrate between two transceiver chains that include respective power adapters in order to convert lower-power RF signals into different higher-power RF signals. The higher-power RF signals may have different output-power levels that are appropriate for the respective communication standards of the separate transceiver chains.

公开(公告)号：US20240205703A1

公开(公告)日：2024-06-20

申请号：US18081159

申请日：2022-12-14

Applicant: Amazon Technologies, Inc.

Inventor： Muhammed Faruk Gencel ,  Basak Oyman ,  Ravi Ichapurapu

IPC: H04W24/08 ,  H04L1/00 ,  H04L43/0823

CPC classification number: H04W24/08 ,  H04L1/0003 ,  H04L43/0847

Abstract: In various examples, systems and methods of wireless communication link adaptation are described. In some examples, first data may be determined for a first gateway device, the first data representing a plurality of received signal strength (RSS) values of a first signal received from a first end node device. Second data representing an interference associated with the first signal may be determined. At least one of a first packet error rate or a first packet success rate may be determined based at least in part on the first data and the second data. A first modulation coding scheme (MCS) associated with at least one of the first packet error rate or the first packet success rate may be determined. Third data may be sent to the first end node, the third data instructing the first end node device to use the first MCS for communication with the first gateway device.

公开(公告)号：US11553416B1

公开(公告)日：2023-01-10

申请号：US17387719

申请日：2021-07-28

Applicant: Amazon Technologies, Inc.

Inventor： Ravi Ichapurapu ,  Durga Laxmi Narayana Swamy Inti ,  Amit Kachroo

IPC: H04W52/02

Abstract: Technologies directed to dynamic memory reallocation and offload channel state information (CSI) processing for device power savings are described. A method includes receiving, by a radio, first data from a processing device. The first data is sent to a second wireless device over a wireless channel. The method measures, by the radio, first CSI values that represent channel properties of the wireless channel. The method sends, by the radio, the first CSI values to the processing device with a first periodicity. The method receives, by the radio from the processing device, second data that specifies a transfer interval and an amount of memory to reserve in a memory buffer for second CSI values measured during the transfer interval. The method measures, by the radio, the second CSI values and sends the second CSI values to the processing device at the end of the transfer interval.

公开(公告)号：US11304042B1

公开(公告)日：2022-04-12

申请号：US16654789

申请日：2019-10-16

Applicant: Amazon Technologies, Inc.

Inventor： Sameet Ramakrishnan ,  Ravi Ichapurapu

IPC: H04W4/80 ,  H04W72/04 ,  H04W4/48 ,  H04J3/06 ,  H04B1/713

Abstract: A multi-Bluetooth radio device is described. In an example, the device includes a first Bluetooth radio storing first instructions that, upon execution on the first Bluetooth radio, configure the first Bluetooth radio to perform first operations. The first operations include establishing a first communication link with a first device and receiving, over the first communication link, an audio packet from the first device. The device also includes a second Bluetooth radio storing second instructions that, upon execution on the second Bluetooth radio, configure the second Bluetooth radio to perform second operations. The second operations include establishing a second communication link with a second device and transmitting, over the second communication link, the audio packet to the second device.

公开(公告)号：US10985850B1

公开(公告)日：2021-04-20

申请号：US16218211

申请日：2018-12-12

Applicant: Amazon Technologies, Inc.

Inventor： Ravi Ichapurapu ,  Sameet Ramakrishnan ,  Morris Yuanhsiang Hsu

IPC: H04H20/18 ,  H04W56/00 ,  H04W4/80 ,  G06F3/16 ,  H04H20/22 ,  H04H20/71 ,  G10L15/22 ,  H04W92/22 ,  H04W84/12 ,  H04W80/02

Abstract: A system includes a media distribution device including a first network interface, a second network interface, and a first processor. The first processor configures the first network interface to use a first communication network, and broadcasts, using the first communication network, audio data. The system includes a media device including a third network interface, a fourth network interface, and a second processor. The second processor causes, using the third network interface, the media device to join the first communication network, receives, using the third network interface, a first portion of the audio data, processes the first portion of the audio data to generate first audio output, and transmits, using the fourth network interface, a control signal to the second network interface of the media distribution device. The control signal is configured to cause the first processor to modify an attribute of the audio data or stop broadcasting the audio data.

公开(公告)号：US20250007548A1

公开(公告)日：2025-01-02

申请号：US18215720

申请日：2023-06-28

Applicant: Amazon Technologies, Inc.

Inventor： Ravi Ichapurapu

IPC: H04B1/16

Abstract: Technologies directed to reducing switching latency between different modulation schemes are described. One sub-gigahertz (sub-GHz) receiver includes radio frequency (RF) circuitry, an analog-to-digital converter (ADC), a first module, and a second module. The ADC can generate in-phase and quadrature samples (IQ samples) representing an RF signal received by the sub-GHz receiver. The first module can demodulate the IQ samples according to a first modulation scheme, and the second module can demodulate the IQ samples according to a second modulation scheme different from the first modulation scheme. The first module and the second module can concurrently demodulate the IQ samples.

公开(公告)号：US11818742B1

公开(公告)日：2023-11-14

申请号：US17884809

申请日：2022-08-10

Applicant: Amazon Technologies, Inc.

Inventor： Milos Jorgovanovic ,  Ravi Ichapurapu ,  Morris Yuanhsiang Hsu ,  Ateet Kapur ,  Pratik Kalpesh Patel ,  Latha Srinivasan

IPC: H04W72/542 ,  H04W72/02 ,  H04W4/80 ,  H04W72/0453 ,  H04W72/541 ,  H04W76/10

CPC classification number: H04W72/542 ,  H04W4/80 ,  H04W72/02 ,  H04W72/0453 ,  H04W72/541 ,  H04W76/10

Abstract: A system and method for network channel selection is provided. A device includes WIFI, ZIGBEE, and BLUETOOTH communication controllers. The device's processor is configured to determine, using the communication controllers, a WIFI channel designated for communications and a first set of ZIGBEE channels designated for communications. The processor is configured to determine that a number of available BLUETOOTH channels that do not overlap the WIFI channel or any in-use ZIGBEE channels is less than a threshold number of BLUETOOTH channels required for communication using a BLUETOOTH protocol. The processor then determines the WIFI channel has a minimum duty cycle from among duty cycles of the WIFI channel and each ZIGBEE channel, determines a first BLUETOOTH channel that at least partially overlaps the WIFI channel, and causes the BLUETOOTH communication controller to transmit data using the first BLUETOOTH channel.