公开(公告)号：US11863359B1

公开(公告)日：2024-01-02

申请号：US17317730

申请日：2021-05-11

Applicant: Amazon Technologies, Inc.

Inventor： Cyril Arokiaraj Arool Emmanuel ,  Satyabh Mishra

IPC: H04L25/03 ,  H04L27/36 ,  H04L27/26 ,  H04L25/02 ,  H04B7/0413 ,  H04L5/00 ,  H04B17/318

CPC classification number: H04L25/03891 ,  H04B7/0413 ,  H04B17/318 ,  H04L5/0023 ,  H04L25/0222 ,  H04L27/2627 ,  H04L27/36

Abstract: Technologies to improve throughput in wireless multiple-input-multiple-output (MIMO) and single-input-single-output (SISO) systems are described. A first device includes a baseband processor with an Orthogonal Frequency Division Multiplexing (OFDM) circuitry that uses a digital multi-carrier modulation scheme that defines a set of data subcarriers, a set of pilot subcarriers, and a direct current (DC) subcarrier to communicate data in a wireless channel between the first device and a second device. The baseband processor also includes subcarrier pre-equalization logic that receives, from the second device, feedback data indicative of a frequency selective fading characteristic of the wireless channel and adjusts a first amplitude value of a subset of the set of data subcarriers to a second amplitude value. Adjusting the first amplitude value to the second amplitude value reduces the frequency selective fading characteristic of the wireless channel.

公开(公告)号：US11652672B1

公开(公告)日：2023-05-16

申请号：US17206995

申请日：2021-03-19

Applicant: Amazon Technologies, Inc.

Inventor： Cyril Arokiaraj Arool Emmanuel ,  Satyabh Mishra

IPC: H04L25/02 ,  H04L27/26

CPC classification number: H04L25/025 ,  H04L25/022 ,  H04L25/0212 ,  H04L27/2607

Abstract: A method and system to determine an adjusted guard interval duration associated with a wireless signal transmitted via a wireless communication link between a first network device and a second network device in a wireless network. The second network device receives a first wireless signal including a first duration of a guard interval from the first network device at a first time. The second network device determines, in view of the set of pilot symbols, a channel impulse response. A channel parameter value is determined based on the channel impulse response. An adjusted guard interval duration corresponding to the channel parameter value is established and used to estimate a second physical rate of the link. The second network device provides a communication identifying the adjusted guard interval duration to the first network device in response to determining the second physical rate is greater than the first physical rate.