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High efficiency long training field symbol transmission for multiple transmission streams

專利號
US11159348B2
公開日期
2021-10-26
申請人
Marvell World Trade Ltd.（SG Singapore）
發(fā)明人
Ankit Sethi; Sayak Roy; Hari Ram Balakrishnan; Sudhir Srinivasa
IPC分類
H04L25/02; H04L25/14; H04B7/0452; H04L27/26; H04W72/04
技術(shù)領(lǐng)域
ltf,he,tones,matrix,symbols,streams,tone,spatial,stream,channel
地域： St. Michael

摘要

Embodiments described herein provide a system for transmitting high efficiency long term training field (HE-LTF) symbols for multiple wireless spatial streams over a wireless channel. An advanced P-matrix design is used to construct HE-LTF symbols that are processed by a receiver such that channel properties such as channel estimates or carrier phase error are determined prior to receiving all HE-LTF symbols. Tone multiplexing of wireless spatial stream is also used to transmit multiple spatial streams based on an assignment of sets of spatial streams to sets of tones available for transmission, increasing the throughput of the transmission system. The advanced P-matrix design and tone multiplexing are used in combination to achieve calculate channel properties before receiving all HE-LTF symbols while minimizing power fluctuation among the high efficiency short training field symbol and the HE-LTF symbols.

說明書

FIG. 8 illustrates a process for receiving HE-LTF symbols transmitted based on the tone multiplexing of FIG. 3 in accordance with at least some embodiments of the present disclosure; and

FIG. 9 illustrates a process for receiving HE-LTF symbols transmitted based on a combination of the advanced P-matrix design of FIG. 2 and the tone multiplexing of FIG. 3 in accordance with at least some embodiments of the present disclosure.

DETAILED DESCRIPTION

This disclosure describes methods and systems for transmitting high efficiency long training field (HE-LTF) symbols for multiple transmission streams. Specifically, various methods for accommodating increasing numbers of transmitted spatial streams based on an advanced P-matrix design, tone multiplexing for spatial streams, and a combination thereof are described herein.

With techniques such as massive multiple input multiple output (MIMO) or millimeter wave being proposed to address the increasing demand for more data at higher speeds, in comparison to systems implemented under the soon to be completed IEEE 802.11ax standard, an access point (AP) in a wireless communications system compliant with emerging will need to initiate a larger number of transmission streams in order to serve many more user devices. With increasing number of transmission streams, the size of the P-matrix—a training matrix for channel estimation that is defined for various matrix sizes in the IEEE 802.11ax standard, used in high efficiency long training field (HE-LTF) symbol generation—will also increase.

權(quán)利要求

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