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

專(zhuān)利號(hào)
US10868589B2
公開(kāi)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(lèi)
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(shuō)明書(shū)

Station 302B is also a single antenna single stream device, though this need not be the case. It could for example have an array of antenna, and MIMO multi-stream transmit and receive capability and as such participate as an MU-MIMO downlink target with station 302A. Station reception in station 302B begins in the RF Stage 542B where downlink communications from the WAP are received on the antenna 540. These received communications are downconverted and supplied as input to the baseband stage 542A. In the baseband stage the received communications are then transformed to the frequency domain in the DFT module 544 from which they are output as discrete OFDM tones 544A. The header portion of each received downlink packet is used by the channel estimator 546A to estimate the frequency dependent distortions in the downlink channel and the updated channel information is passed to the equalizer 546B to equalize the received OFDM tones. The received communication stream is then demapped, deinterleaved, descrambled and decoded in the demapper decoder 548 and then passed to the packet disassembler 550, which outputs the received uplink communication.

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