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

專利號

US10868589B2

公開日期

2020-12-15

申請人

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

技術領域

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

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FIG. 4A is a graph of communication channel variations as a function of time. MU-MIMO precoding attempts to find a precoding matrix such that transmissions intended for a given user cause no interference for any of the other users included in the MU transmission. For the purposes of the discussion, we can assume that zero-forcing precoding is used to achieve this interference cancellation.

The precoding is based on knowledge of all the channels between the AP and each of the intended receivers. Denote the channel between the AP and user i as H_i. If there are N_uusers, we have:
H_i,i=1, . . . ,N_u??(1)
where H_iis an N_RX,i×N_TXmatrix, assuming that the receiver i has N_RX,ireceive antennas and the AP has N_TXtransmit antennas. For each of the users, the AP determines a precoding matrix Q_j, j=1, . . . , N_u, such that:
H_iQ_j=0,i≠j??(2)
if the number of streams sent to user j is N_STS,j, Q_jis an N_TX×N_STS,jmatrix.

If we build a composite channel matrix consisting of all individual channel matrices H_iand a full precoding matrix that has the various Q_jas columns, we find that:

$\begin{matrix} [\begin{matrix} H_{1} \\ ? \end{matrix} \end{matrix}$

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

摘要

說明書

權(quán)利要求

白丝美女被狂躁免费视频网站,500av导航大全精品,yw.193.cnc爆乳尤物未满,97se亚洲综合色区,аⅴ天堂中文在线网官网

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

摘要

說明書

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