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High efficiency long training field symbol transmission for multiple transmission streams

專利號(hào)
US11159348B2
公開日期
2021-10-26
申請(qǐng)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

At 804, a fixed matrix to be used for the construction of the larger LTF mapping matrix is determined. The fixed matrix is, in some embodiments, a standard P-matrix as defined for IEEE 802.11ax. For example, the fixed matrix could be a standard 2×2, 4×4, 6×6, or 8×8 P-matrix. As described in the description of FIG. 2, a fixed matrix used in the construction of the 16×16 advanced P-matrix is a row of a standard 4×4 P-matrix (e.g., P4×41). The fixed matrix is determined based on the maximum number of spatial streams over all sets of spatial streams. For example, in the spatial stream assignment of {3, 3, 3, 2}, a standard 4×4 P-matrix is determined to be the fixed matrix because 4 is the smallest dimension of the standard P-matrices that is larger than the largest number of spatial streams assigned to any set, 3.

At 806, a first channel estimate associated with the subset of the plurality of tones is calculated based on the fixed matrix. A Hermitian of the fixed matrix is, in some implementations, used in an undo P operation applied to the received LTF-mapping matrix. For example, a Hermitian of a standard 4×4 P-matrix is applied to the received signal during a HE-LTF symbol such that the resulting calculation is a representation of the channel response that is spatially mapped by a Q-matrix according to the number of spatial streams transmitted over a set of tones and the number of antennas at a transmitter. In the description of FIG. 3, an example of HNr×NtQ(1)Nt×3 is given that is representative of the channel response of the spatial streams transmitted over tones {0, 4, 8, . . . , 252}.

權(quán)利要求

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