# US 10,320,601 B2 · Transmitting/receiving device and method in wireless communication system

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- Number: US 10,320,601 B2
- Document ID: US10320601B2
- Status: Granted
- Kind: B2
- Application number: 15/506,651
- Filed: 2015-08-24
- Published: 2018-06-07
- Granted: 2019-06-11
- Earliest claimed: 2014-08-25
- Assignees: LG Electronics Inc.
- Applicants: LG Electronics Inc.
- Inventors: Wookbong Lee; Jinsoo Choi; Dongguk Lim; Jinyoung Chun; Hangyu Cho
- Web page: https://patentgrep.com/patent/US10320601B2

## CPC

- H04L 27/26132: {using repetition}
- H04L 27/26: Systems using multi-frequency codes (H04L27/32 takes precedence)
- H04L 27/2691: {involving interference determination or cancellation}
- H04L 27/2698: {double density OFDM/OQAM system, e.g. OFDM/OQAM-IOTA system}
- H04W 28/22: Negotiating communication rate
- H04B 7/0452: Multi-user MIMO systems
- H04B 7/061: {using feedback from receiving side}
- H04B 7/0669: {using different channel coding between antennas (space-time coding H04L1/0618)}
- H04L 27/2607: {Cyclic extensions}
- H04L 69/323: in the physical layer [OSI layer 1]
- H04W 72/1215: {for collaboration of different radio technologies}
- H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M)
- H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72)
- H04B: TRANSMISSION

## Abstract

Disclosed herein is a station (STA) device of a wireless LAN (WLAN) system. The STA device includes a radio frequency (RF) unit sending and receiving a radio signal and a processor controlling the RF unit. The processor may generate a physical protocol data unit (PPDU) including a physical preamble and a data field and send the PPDU using the RF unit.

## Claims

### Claim 1

An access point (AP) device in a wireless local area network (WLAN) system, the AP device comprising:
a transceiver; and
a processor,
wherein the processor is configured to:
generate a physical protocol data unit (PPDU) including a physical preamble and a data field, and
control the transceiver to send the PPDU to one or more stations (STAs) by spatial multiplexing a plurality of streams,
wherein the physical preamble includes a legacy preamble and a high efficiency (HE) preamble,
wherein the HE preamble includes an HE signal A (HE-SIG-A) field, an HE signal B (HE-SIG-B) field, an HE-short training field (STF), and an HE-long training field (LTF), the HE-SIG-B field being located in front of the HE-STF and the HE-LTF,
wherein an HE-LTF sequence for each of the plurality of streams is mapped to frequency resources in a single symbol, and
wherein HE-LTF sequences for one or more streams mapped to a same subcarrier among the plurality of streams are code division multiplexed by a P matrix to generate a multiplexed HE-LTF.

### Claim 2 (depends on 1)

The AP device of claim 1, wherein the HE-SIG-B field is encoded in a bandwidth unit forming a channel and transmitted.

### Claim 3 (depends on 1)

The AP device of claim 1, wherein the multiplexed HE-LTF is repeated at tone intervals of a specific number in a frequency domain.

### Claim 4 (depends on 3)

The AP device of claim 3, wherein the specific number is 2 or 4.

### Claim 5

A method for transmitting, by an access point (AP) device, data in a wireless local area network (WLAN) system, the method comprising:
generating a physical protocol data unit (PPDU) including a physical preamble and a data field; and sending the PPDU to one or more stations (STAs) by spatial multiplexing a plurality of streams,
wherein the physical preamble includes a legacy preamble and a high efficiency (HE) preamble,
wherein the HE preamble includes an HE signal A (HE-SIG-A) field, an HE signal B (HE-SIG-B) field, an HE-short training field (STF), and an HE-long training field (LTF), the HE-SIG-B field being located in front of the HE-STF and the HE-LTF,
wherein an HE-LTF sequence for each of the plurality of streams is mapped to frequency resources in a single symbol, and
wherein HE-LTF sequences for one or more streams mapped to a same subcarrier among the plurality of streams are code division multiplexed by a P matrix to generate a multiplexed HE-LTF.

### Claim 6 (depends on 5)

The method of claim 5, wherein the HE-SIG-B field is encoded in a bandwidth unit forming a channel and transmitted.

### Claim 7 (depends on 5)

The method of claim 5, wherein the multiplexed HE-LTF is repeated at tone intervals of a specific number in a frequency domain.

### Claim 8 (depends on 7)

The method of claim 7, wherein the specific number is 2 or 4.