公开(公告)号：US20180287830A1

公开(公告)日：2018-10-04

申请号：US15472073

申请日：2017-03-28

Applicant: QUALCOMM Incorporated

Inventor： Simone Merlin ,  Dung Ngoc Doan ,  Jialing Li Chen ,  Vinayak Chowdiah ,  Hemanth Sampath

IPC: H04L25/03 ,  H04L29/06 ,  H04W52/52 ,  H04B17/336

Abstract: This disclosure provides systems, methods and apparatuses for pre- and post-packet detection interference nulling. In some implementations, a method includes detecting at least a first part of an unscheduled Wi-Fi packet and performing a channel estimation. The method also may include estimating an interference on the Wi-Fi channel based on a known non-zero portion of the preamble of the Wi-Fi packet and nulling interference from the Wi-Fi channel during reception of at least a second part of the Wi-Fi packet. In some implementations, the method can determine an interference estimate based on at least one of a previously received packet or channel sampling for a Wi-Fi channel and computer a filter based at least in part on the interference estimate. The method also includes applying the filter to a received signal to null interference on the Wi-Fi channel at least before detection of a Wi-Fi packet.

公开(公告)号：US20180083747A1

公开(公告)日：2018-03-22

申请号：US15270242

申请日：2016-09-20

Applicant: QUALCOMM Incorporated

Inventor： Dung Doan ,  Vinayak Chowdiah ,  Ronald Gibson ,  Balakumar Jayaraman ,  Maksim Krasnyanskiy ,  Bin Tian ,  Rahul Tandra ,  Luiza Timariu ,  Harshit Joshi

IPC: H04L5/00 ,  H04L29/06 ,  H04L12/26

CPC classification number: H04L5/0023 ,  H04B7/0452 ,  H04L27/2646 ,  H04L27/2657 ,  H04L27/2675 ,  H04L2027/0026 ,  H04W84/12

Abstract: Methods, systems, and devices for wireless communication are described including determining one or more unfiltered CFOs, filtering the one or more unfiltered CFOs to identify a refined CFO based at least in part on the one or more unfiltered CFOs and a predetermined number of packets, modifying a transmission parameter based at least in part on the refined CFO, and transmitting a signal in a MU-MIMO environment based at least in part on the modified transmission parameter.