US 2017/0288836 A1Published application

Method and apparatus of transmitting training signal in wireless local area network system

AssigneeLG Electronics Inc.

InventorsByeong Woo KANG, Dong Wook ROH, Yong Ho SEOK, Yu Jin NOH, Bong Hoe KIM, Dae Won LEE

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Abstract

A method of transmitting a training signal in a Wireless Local Area Network (WLAN) system includes generating one or more first training signals for a first destination station and one or more second training signals for a second destination station by applying a mapping matrix P to a training signal generation sequence, mapping the first training signals and the second training signals to a plurality of antennas according to an antenna mapping matrix, and performing Inverse Fast Fourier Transform (IFFT) on each of the first training signals and the second training signals mapped to the plurality of antennas and transmitting the training signals through the plurality of antennas.

Claims8

Dependent claims

A method of receiving a training signal in a Wireless Local Area Network (WLAN) system, the method comprising:

receiving, by a receiving station, a physical layer protocol data unit (PPDU) including a Very High Throughput-Long Training Field (VHT-LTF) from a transmitting station, wherein the VHT-LTF is received on VHT-LTF symbols;
and
processing, by the receiving station, the VHT-LTF,
wherein the VHT-LTF symbols are generated based on a mapping matrix P,
wherein the mapping matrix P is set to a first mapping matrix P when a total number of spatial streams used for the PPDU is set to seven (7),
wherein the mapping matrix P is set to the first mapping matrix P when the total number of spatial streams used for the PPDU is set to eight (8),
wherein the mapping matrix P is set to a second mapping matrix P when the total number of spatial streams used for the PPDU is set to five (5),
wherein the mapping matrix P is set to the second mapping matrix P when the total number of spatial streams used for the PPDU is set to six (6),
wherein the mapping matrix P is set to a third mapping matrix P when the total number of spatial streams used for the PPDU is set to three (3),
wherein the mapping matrix P is set to the third mapping matrix P when the total number of spatial streams used for the PPDU is set to four (4), and
wherein a number of the VHT-LTF symbols is set to eight (8) when the total number of spatial streams used for the PPDU is set to seven (7);
and
wherein the third mapping matrix P is a 4-by-4 submatrix, which is denoted by P1,
wherein the first mapping matrix P is an 8-by-8 matrix configured in a form of
[
P
1
P
1
P
1
-
P
1
]
,
wherein the second mapping matrix P is a 6-by-6 matrix configured in a form of
[
P
2
P
3
P
4
P
5
]
,
wherein first seven rows of the first mapping matrix P are applied for the PPDU when the total number of spatial streams used for the PPDU is set to seven (7),
wherein first five rows of the second mapping matrix P are applied for the PPDU when the total number of spatial streams used for the PPDU is set to five (5), and
wherein the second mapping matrix P is configured in form of
[
P
2
P
3
P
4
P
5
]
,
and P2 to P5 are four different 3-by-3 submatrices.

50 more elements

A receiving station in a Wireless Local Area Network (WLAN) system, comprising:

a radio frequency (RF) unit for receiving a signal from a transmitting station;
and
a processor coupled to the RF unit and configured to:
receive a physical layer protocol data unit (PPDU) including a Very High Throughput-Long Training Field (VHT-LTF) from a transmitting station, wherein the VHT-LTF is received on VHT-LTF symbols;
and
process the VHT-LTF,
wherein the VHT-LTF symbols are generated based on a mapping matrix P,
wherein the mapping matrix P is set to a first mapping matrix P when a total number of spatial streams used for the PPDU is set to seven (7),
wherein the mapping matrix P is set to the first mapping matrix P when the total number of spatial streams used for the PPDU is set to eight (8),
wherein the mapping matrix P is set to a second mapping matrix P when the total number of spatial streams used for the PPDU is set to five (5),
wherein the mapping matrix P is set to the second mapping matrix P when the total number of spatial streams used for the PPDU is set to six (6),
wherein the mapping matrix P is set to a third mapping matrix P when the total number of spatial streams used for the PPDU is set to three (3),
wherein the mapping matrix P is set to the third mapping matrix P when the total number of spatial streams used for the PPDU is set to four (4), and
wherein a number of the VHT-LTF symbols is set to eight (8) when the total number of spatial streams used for the PPDU is set to seven (7);
and
wherein the third mapping matrix P is a 4-by-4 submatrix, which is denoted by P1,
wherein the first mapping matrix P is an 8-by-8 matrix configured in a form of
[
P
1
P
1
P
1
-
P
1
]
,
wherein the second mapping matrix P is a 6-by-6 matrix configured in a form of
[
P
2
P
3
P
4
P
5
]
,
wherein first seven rows of the first mapping matrix P are applied for the PPDU when the total number of spatial streams used for the PPDU is set to seven (7),
wherein first five rows of the second mapping matrix P are applied for the PPDU when the total number of spatial streams used for the PPDU is set to five (5), and
wherein the second mapping matrix P is configured in form of
[
P
2
P
3
P
4
P
5
]
,
and P2 to P5 are four different 3-by-3 submatrices.

53 more elements

Dependencies are inferred from the claim text.

Facts

Application: 15/625,794Filed 16 Jun 2017
Priority: 10 Dec 2009
Published: 5 Oct 2017
Term ends: Not estimatedThe source records don’t support an estimate.

Classification6 codes

H04L 5/0048
Arrangements for allocating sub-channels of the transmission path: allocation of pilot signals, i.e. of signals known to the receiver
H04L 27/2634
Modulators: inverse fast Fourier transform [IFFT] or inverse discrete Fourier transform [IDFT] modulators in combination with other circuits for…
H04W 99/00
Subject matter not provided for in other groups of this subclass
H04W 84/12
Small scale networks; Flat hierarchical networks: wLAN [Wireless Local Area Networks]

Family

Application61/285,524Us provisional application · filed 10 Dec 2009
Application12/965,635Continuation · filed 10 Dec 2010
Application14/694,346Continuation · filed 23 Apr 2015
Application15/625,794Continuation
US 10,530,543 B2Related patent
US 2011/0142020 A1Published application
US 2015/0236831 A1Published application
US 9,042,484 B2Related patent
US 9,716,574 B2Related patent
US 2017/0288836 A1This patent

From the US filing history. Foreign family members aren’t listed.

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