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Hybrid MU-MIMO spatial mapping using both explicit sounding and crosstalk tracking in a wireless local area network

專利號(hào)
US10868589B2
公開日期
2020-12-15
申請(qǐng)人
Quantenna Communications, Inc.（US CA San Jose）
發(fā)明人
Sigurd Schelstraete
IPC分類
H04B7/0452; H04B7/0456; H04L5/00; H04B17/336; H04L25/02; H04B7/0417; H04L12/26; H04W84/12; H04W88/08
技術(shù)領(lǐng)域
sounding,mu,mimo,wap,crosstalk,downlink,packet,channel,precode,precoding
地域： CA CA San Jose

摘要

Systems and methods for a wireless station supporting wireless communications with an associated wireless access point (WAP) on a wireless local area network (WLAN) where the wireless station can include hardware processing circuitry to perform hybrid spatial mapping feedback operations for multi-user (MU) multiple-input multiple-output (MIMO) downlinks from the WAP to a group of associated stations. An exemplary implementation includes a channel estimation circuit to determine a communication channel responsive to an explicit sounding from the WAP, and to transmit channel sounding feedback to the WAP indicating the determined communication channel; and a crosstalk tracking circuit to determine an amount of crosstalk from portions of a downlink MU-MIMO communication packet targeted for other stations in the group of associated stations, and to transmit crosstalk feedback to the WAP as to the determined amount of crosstalk.

說明書

FIG. 4E is a graph of explicit sounding overhead as a function of modulation and code schema (MCS) used to transmit sounding feedback. FIG. 4E shows representative results for an 8×8 WAP regularly sounding 6 4×4 stations on all tones across an 80 MHz channel. This represent the total airtime needed per sounding. FIG. 4E shows, it is possible to keep the SINR degradation within a desired range through a combination of receiver feedback and frequent channel sounding. The number of soundings required to keep the degradation to within 3 dB is very high however (about 30 in the example shown in FIG. 4D).

In this section, we explore a different approach to keeping the precoding matrix “Q” more closely matched to the actual channel—even if it was originally calculated on a different initial channel. The approach does not consist of sounding and re-calculating the precoding matrix. Instead, we make small incremental changes directly to the precoding matrix, without even having full information about the channel change. Let's denote to composite channel consisting of all individual channels as:

H _ = [ H 1 ? H N

權(quán)利要求

1
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