Method for transmitting signals in dcm mode in wireless lan system, and device for same

Patent metadata

Field	Value
Publication number	US-2018241597-A1
Application number	US-201615751447-A
Country	US
Kind code	A1
Filing date	Aug 9, 2016
Priority date	Aug 12, 2015
Publication date	Aug 23, 2018
Grant date	—

Abstract

Disclosed according to one embodiment of the present invention is a method whereby a first station (STA) transmits signals using dual carrier modulation (DCM) in a wireless LAN system, comprising: modulating HE-SIG B field information and/or data field information on a wireless frame transmitted by the first STA and transmitting same to a second STA, wherein in the case of modulating the HE-SIG B field information and/or the data field information in a BPSK mode, if a random symbol C1 among symbols modulated in the BPSK mode is mapped to a subcarrier K, a symbol formed by rotating the phase of the symbol C1 is mapped to a subcarrier K+N/2 in a repeating manner, wherein N corresponds to the number of subcarriers of a resource unit for transmitting the HE-SIG B field information and the data field information and K is a random integer equal to or less than N/2.

First claim

1 . A method for a first station STA, to transmit signals using a DCM, Dual Carrier Modulation, in a wireless local area network, WLAN, the method comprising:
modulating one or more of a HE-SIG B field and a data field of a radio frame to be transmitted by the first STA; wherein, when the one or more of the HE-SIG B field and the data field are modulated by a BPSK scheme, a symbol, Cl, of BPSK modulated symbols is mapped to a subcarrier K and a phase shifted symbol of the symbol, C 1 , is repeatedly mapped to a subcarrier K+N/2, wherein N corresponds to a number of resource units for transmitting the HE-SIG B field and the data field, and wherein K is an integer equal to or less than N/2; and transmitting the symbols mapped to the subcarriers to a second STA.

2 . The method according to claim 1 , wherein, when the one or more of the HE-SIG B field and the data field are modulated by a QPSK scheme, a symbol, C 2 , of QPSK modulated symbols is mapped to the subcarrier K and a conjugate of the symbol, C 2 , is repeatedly mapped to the subcarrier K+N/2.

3 . The method according to claim 2 , wherein the phase shifted symbol of the symbol, C 1 , is generated by multiplying a phase rotator to the symbol, C 1 .

4 . The method according to claim 3 , wherein the phase rotator corresponds to exp j(K+N/2) π.

5 . The method according to claim 1 , wherein a HE-SIG A field of the radio frame includes an indicator indicating whether the DCM is applied to the HE-SIG B field and the data field.

6 . The method according to claim 5 , wherein the indicator has 1 bit length, and wherein the first STA determines a modulation scheme for the one or more of the HE-SIG B field and the data field based on information on a MCS field and the indicator of the HE-SIG A field.

7 . The method according to claim 1 , wherein, when the one or more of the HE-SIG B field and the data field are modulated by the BPSK scheme, each bit of the one or more of the HE-SIG B field and the data field is mapped to each of the BPSK modulated symbols, and wherein the BPSK modulated symbols are mapped to subcarriers at a lower half of the resource units.

8 . A station, STA, transmitting signals using a DCM, Dual Carrier Modulation, in a wireless local area network WLAN, comprising:
a processor configured to modulate one or more of a HE-SIG B field and a data field of a radio frame to be transmitted by the STA; and a transceiver configured to transmit symbols modulated by the processor to a different STA, wherein, when the one or more of the HE-SIG B field and the data field are modulated by a BPSK scheme, and a symbol, C 1 , of BPSK modulated symbols is mapped to a subcarrier K, the processor is configured to repeatedly map a phase shifted symbol of the symbol, C 1 , to a subcarrier K+N/2, wherein N corresponds to a number of resource units for transmitting the HE-SIG B field and the data field, and wherein K is an integer equal to or less than N/2.

9 . The STA according to claim 8 , wherein, when the one or more of the HE-SIG B field and the data field are modulated by a QPSK scheme, and a symbol, C 2 , of QPSK modulated symbols is mapped to the subcarrier K, the processor is configured to repeatedly map a conjugate of the symbol, C 2 , to the subcarrier K+N/2.

10 . The STA according to claim 9 , wherein the processor is configured to generate the phase shifted symbol of the symbol, C 1 , by multiplying a phase rotator to the symbol, C 1 .

11 . The STA according to claim 10 , wherein the phase rotator corresponds to exp j(K+N/2) π.

12 . The STA according to claim 8 , wherein the processor is configured to make a HE-SIG A field of the radio frame have an indicator indicating whether the DCM is applied to the HE-SIG B field and the data field.

13 . The STA according to claim 12 , wherein the indicator has 1 bit length, and wherein the processor is configured to determine a modulation scheme for the one or more of the HE-SIG B field and the data field based on information on a MCS field and the indicator of the HE-SIG A field.

14 . The STA according to claim 8 , wherein, when the one or more of the HE-SIG B field and the data field are modulated by the BPSK scheme, the processor is configured to map each bit of the one or more of the HE-SIG B field and the data field to each of the BPSK modulated symbols, and wherein the BPSK modulated symbols are mapped to subcarriers at a lower half of the resource unit.

Assignees

• Lg Electronics Inc

Inventors

• Lim Dongguk
• Chun Jinyoung
• Choi Jinsoo
• Cho Hangyu
• Kim Jinmin
• Park Eunsung

Classifications

• H04L1/04

  using frequency diversity · CPC title

• H04L27/28

  with simultaneous transmission of different frequencies each representing one code element · CPC title

• H04L27/2627

  Modulators · CPC title

• H04L5/0044

  Allocation of payload; Allocation of data channels, e.g. PDSCH or PUSCH · CPC title

• H04L1/00

  Arrangements for detecting or preventing errors in the information received {(correcting synchronisation H04L7/00)} · CPC title