WO2013191449A1 - Dispositif et procédé de transmission ofdm dans un système lan sans fil - Google Patents

Dispositif et procédé de transmission ofdm dans un système lan sans fil Download PDF

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Publication number
WO2013191449A1
WO2013191449A1 PCT/KR2013/005376 KR2013005376W WO2013191449A1 WO 2013191449 A1 WO2013191449 A1 WO 2013191449A1 KR 2013005376 W KR2013005376 W KR 2013005376W WO 2013191449 A1 WO2013191449 A1 WO 2013191449A1
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WO
WIPO (PCT)
Prior art keywords
signal
phase
modulated symbols
symbols
wireless lan
Prior art date
Application number
PCT/KR2013/005376
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English (en)
Korean (ko)
Inventor
유희정
정민호
이재승
권형진
이석규
Original Assignee
한국전자통신연구원
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from KR1020130069404A external-priority patent/KR20130142932A/ko
Application filed by 한국전자통신연구원 filed Critical 한국전자통신연구원
Priority to US14/408,933 priority Critical patent/US9264274B2/en
Priority to CN201380032658.4A priority patent/CN104380678B/zh
Publication of WO2013191449A1 publication Critical patent/WO2013191449A1/fr
Priority to US15/017,035 priority patent/US9912509B2/en
Priority to US15/874,827 priority patent/US10812309B2/en
Priority to US17/022,962 priority patent/US11463293B2/en

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
    • H04L1/0056—Systems characterized by the type of code used
    • H04L1/0071—Use of interleaving
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/08—Arrangements for detecting or preventing errors in the information received by repeating transmission, e.g. Verdan system
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems
    • H04L27/2602—Signal structure
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems
    • H04L27/2602—Signal structure
    • H04L27/261—Details of reference signals
    • H04L27/2613—Structure of the reference signals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems
    • H04L27/2602—Signal structure
    • H04L27/261—Details of reference signals
    • H04L27/2613—Structure of the reference signals
    • H04L27/26132—Structure of the reference signals using repetition

Definitions

  • Orthogonal Frequency Division Multiplexing (OFDM) transmission method and apparatus in a WLAN system.
  • the first direction is a technology to further increase the transmission speed, there is a WLAN technology using a 60GHz band and a WLAN technology using a 5GHz band.
  • the second technology is a wide area WLAN technology that utilizes a frequency band of less than 1 GHz to increase coverage than the existing WLAN technology.
  • the third direction is a technique for reducing the link setup time of the WLAN system.
  • the wide area WLAN technology may support multi-bandwidth, and may use an OFDM transmission scheme. Due to the characteristics of the OFDM transmission scheme, a problem of high peak to average power ratio (PAPR) may occur.
  • PAPR peak to average power ratio
  • the present invention provides a method and apparatus for reducing power consumption of a station in a wide area wireless LAN system.
  • an OFM transmission apparatus of a WLAN system includes: a signal repeater for repeating an encoded signal in units of blocks and outputting the encoded signal and the repeated signal together; An interleaver for interleaving the repeated signal to output an interleaved signal, a modulator for modulating the interleaved signal to output modulated symbols, and a phase rotation unit for changing a phase of the modulated symbols.
  • the phase rotation unit may maintain a phase of symbols modulating the encoded signal among the modulated symbols and change a phase of symbols modulating the repeated signal among the modulated symbols.
  • the phase rotation unit may maintain the phase of some symbols among the symbols for modulating the repeated signal and change the phase of the remaining symbols.
  • the phase rotation unit may change the phase of the modulated symbols by 45 °, 90 °, 135 °, or 180 °.
  • the encoded signal may be data for a bandwidth mode having a lowest signal-to-noise ratio among a plurality of bandwidths supported by the WLAN system.
  • the frame structure of the bandwidth mode with the lowest signal-to-noise ratio includes a basic frame and a duplication frame that is out of phase with the basic frame.
  • the basic frame includes a short training field (STF) and a long training field ( It may include a Long Training Field (LTF) and a repetition coded SIG field.
  • STF short training field
  • LTF Long Training Field
  • a method for transmitting OMDDM of a WLAN system repetition of an encoded signal on a block basis and outputting the encoded signal and the repeated signal together, and the encoded signal and the repetition Interleaving the interleaved signal to output an interleaved signal, modulating the interleaved signal to output modulated symbols, and changing a phase of the modulated symbols.
  • an OFM transmission apparatus of a WLAN system includes a signal repeater for repeating an encoded signal in units of blocks and outputting the encoded signal and the repeated signal together, and the repeated signal
  • a bit conversion unit for converting the bit information of the interleaver, an interleaver for outputting an interleaved signal by interleaving the encoded signal and the signal in which the bit information is converted, and modulating the interleaved signal to output modulated symbols It includes a modulator.
  • an OFM transmission method of a WLAN system includes repetition of an encoded signal in units of blocks and outputting the encoded signal and the repeated signal together, and bit information of the repeated signal. Converting the interleaved signal; interleaving the encoded signal and the bit information converted signal; outputting an interleaved signal; and modulating the interleaved signal to output modulated symbols.
  • a method and apparatus for reducing PAPR in a WLAN system using OFDM modulation of a frequency repetition technique are provided.
  • the power consumption of the station can be reduced in the wide area WLAN system.
  • FIG. 1 is a diagram for describing multiple bandwidths of a wide area wireless LAN system.
  • FIG. 2 is a diagram illustrating a frame structure of a 1 MHz mode among multiple bandwidths of a wide area wireless LAN system.
  • FIG. 3 is a diagram illustrating a structure of a transmitting end of a WLAN system according to an exemplary embodiment.
  • FIG. 4 is a diagram for describing a method of transmitting an OS of a WLAN system according to an embodiment.
  • 5A and 5B illustrate a configuration example of a duplication mode frame according to an embodiment.
  • FIG. 6 is a diagram for describing an OMD transmission apparatus of a wireless LAN system according to an embodiment.
  • FIG. 7 is a diagram for describing an OMD transmission apparatus of a wireless LAN system according to another embodiment.
  • FIG. 1 is a diagram for describing multiple bandwidths of a wide area wireless LAN system.
  • a wide area WLAN system may support multiple bandwidths.
  • the multiple bandwidths can include a first bandwidth having the lowest signal-to-noise ratio and a second bandwidth that is twice the first bandwidth.
  • the value of the first bandwidth may be 1 MHz.
  • the multi-bandwidth may include a 1 MHz bandwidth 110, a 2 MHz bandwidth 120, a 4 MHz bandwidth 130, an 8 MHz bandwidth 140, and a 16 MHz bandwidth 150.
  • the frequency band of the wide area wireless LAN system may be 1 GHz or less.
  • multiple bandwidths include 1 MHz, 2 MHz, 4 MHz, 8 MHz, and 16 MHz.
  • the lower frequency limit value 161 of FIG. 1 may be a value between 700 and 920 [MHz]
  • the upper frequency limit value 163 may be a value between 750 and 930 [MHz].
  • the 1 MHz bandwidth 110 may be allocated over an entire channel, and the remaining bandwidths 120, 130, 140, and 150 may be allocated only to a partial interval of the entire channel.
  • the 16 MHz bandwidth 150 may be allocated between the frequency upper limit value 163 at 165 of FIG. 1.
  • 8 MHz is allocated to the 2 MHz bandwidth 120
  • 4 channels are allocated to the 4 MHz bandwidth 130
  • 2 channels are allocated to the 8 MHz bandwidth 140.
  • the channel assignment shown in FIG. 1 is exemplary, and the number and frequency bands of the channels can be configured in various ways.
  • a transmission mode having a bandwidth value of 1 MHz (110) will be referred to as a 1 MHz mode
  • a transmission mode having a bandwidth value of 2 MHz (120) will be referred to as a 2 MHz mode.
  • the 1MHz mode is a transmission mode having 32 subcarriers while maintaining an Orthogonal Frequency Division Multiplexing (OFDM) symbol structure.
  • OFDM Orthogonal Frequency Division Multiplexing
  • terminals may receive both a signal transmitted in a 1 MHz mode and a signal transmitted in a 2 MHz mode.
  • the wide area WLAN system may have a very low data rate and a low frequency. Therefore, it is very important to reduce the power consumption of a wide area wireless LAN system and to increase the communication reach distance of a station (STA) or an access point (AP) after being installed for a long time.
  • STA station
  • AP access point
  • a frequency repetition scheme may be used for a BPSK, 1/2 binary convolutional code (BCC) transmission rate of 1 MHz mode.
  • BCC binary convolutional code
  • PAPR peak to average power ratio
  • Embodiments of the present invention can reduce the PAPR by changing the phase of the symbol after the modulation process.
  • FIG. 2 is a diagram illustrating a frame structure of a 1 MHz mode among multiple bandwidths of a wide area wireless LAN system.
  • a 1 MHz mode frame includes a short training field (STF) 210, a long training field (LTF1) 220, and a repetition coded SIG field ( 230).
  • STF short training field
  • LTF1 long training field
  • 230 repetition coded SIG field
  • the STF 210 is a short training interval for signal detection, automatic gain adjustment, initial synchronization, and the like.
  • LTF1 220 is a channel estimation interval for detecting fine synchronization and SIG symbols.
  • the SIG field 230 of the 1 MHz mode frame has a structure in which information on bandwidth is omitted and may include 36 bits of information.
  • LTF 2 to LFT N may be added together with LTF1 for MIMO (multi input multi output) channel estimation.
  • the length of LTF 2 to LFT N may vary depending on the number of transport streams.
  • FIG. 3 is a diagram illustrating a structure of a transmitting end of a WLAN system according to an exemplary embodiment.
  • the transmitter shown in FIG. 3 may perform frequency domain repetitive transmission by BPSK-modulating a frame in a 1 MHz mode.
  • a scrambler 310 randomizes the data received from the media access control (MAC) layer.
  • MAC media access control
  • Forward error correction (FEC) 320 may perform 1/2 encoding for forward error correction.
  • the 2x block-wise repetition 330 refers to a unit for repeating a bit string in block units inserted into one OFDM symbol.
  • the 2x block-wise repetition 330 may output the encoded bit string + the repeated bit string by repeating the encoded bit string in units of 12 bits.
  • An interleaver 340 performs interleaving.
  • the BPSK 350 refers to a unit that performs BPSK modulation.
  • the IFFT 370 may perform a 32-bit inverse fast fourier transform (IFFT) that converts a frequency domain signal into a time domain signal.
  • IFFT inverse fast fourier transform
  • the time domain signal output from the IFFT 370 may be processed through an analog 390 after a guard interval is added in the GI 380.
  • the output signal of the BPSK 350 may be input to the IFFT 370 as it is.
  • the same signal is repeated twice in one OFDM symbol. Therefore, a structure in which the same signal is repeated twice in one OFDM symbol may have a larger PAPR than a general OFDM signal due to the correlation characteristics caused by the repetition of the signal.
  • the correlation characteristic due to the repetition of the signal may be reduced by the phase change.
  • Phase rotation 360 changes the phase of the output signal of the BPSK 350 according to a predetermined rule.
  • the preset rule may be distinguished by a control signal.
  • the preset rule may be to change the phase only for the BPSK modulated symbol of the repeated signal among the BPSK modulated symbols.
  • the output signal of each block shown in FIG. 3 may be expressed as shown in Table 1.
  • 12 independent BPSK modulated signals may be transmitted in two subcarriers in one OFDM symbol.
  • phase rotation 360 may include symbols a1, a2, b2, b2, b3, b4, b5, b6, b7, b8, b9, b10, b11, and b12 that modulate the encoded signals.
  • the phases of a3, a4, a5, a6, a7, a8, a9, a10, a11, and a12 remain unchanged, and the symbols ( a1, a2, a3, a4, a5) that modulate the repeated signal among the modulated symbols , a6, a7, a8, a9, a10, a11, a12 ) can be changed.
  • the phase rotation 360 may include phases of some symbols among the symbols a1, a2, a3, a4, a5, a6, a7, a8, a9, a10, a11, and a12 that modulate the repeated signal. In this case, only six symbols a5, a6, a1, a2, a10, and a3 may change phase.
  • the lowest PAPR may occur when the phases of some symbols of the symbols that modulate the repeated signal are changed and the phases of the remaining symbols are changed.
  • Phase rotation 360 may change the phase of the modulated symbols by 45 °, 135 °, or 180 ° as well as a 90 ° phase change.
  • the symbol for changing the phase among 24 symbols may also be changed.
  • phase rotation 360 may change the phase of " a6 a8 a1 a10 a11 a12 ".
  • the phase rotation 360 may be implemented by only changing the sign.
  • the inversion of the sign means, for example, that BPSK symbol -1 is changed to 1 and BPSK symbol 1 is changed to -1.
  • the 180 ° phase change may be implemented by sign inversion of “ a6 a8 a1 a10 a11 a12 ” after BPSK modulation, but unlike FIG. 3, 0 to 1 and 1 to 0 in the bit information before BPSK modulation. It can also be implemented by converting to.
  • phase rotation 360 process may be replaced.
  • the bit conversion may be an XOR operation on the repeated bit strings [ b1 b2 b3 b4 b5 b6 b7 b8 b9 b10 b11 b12] and [1 0 0 0 0 1 0 1 0 1 1 1].
  • PAPR can be reduced even when the phase of all symbols (a1 a9 a5 a2 a10 a6 a3 a11 a7 a4 a12 a8 a5 a1 a9 a6 a2 a10 a7 a3 a11 a8 a4 a12 ) is changed. .
  • FIG. 4 is a diagram for describing a method of transmitting an OS of a WLAN system according to an embodiment.
  • the method shown in FIG. 4 may be performed by the transmitting end shown in FIG. 3 or the transmitting device shown in FIG.
  • the transmitter repeats the encoded signal in units of blocks and outputs the encoded signal and the repeated signal together.
  • the transmitter outputs an interleaved signal by interleaving the encoded signal and the repeated signal.
  • step 410 the transmitter changes the phase of the modulated symbols.
  • the transmitter In operation 420, the transmitter generates a signal in the time domain from the signal in the frequency domain through the IFFT, and transmits the frame in operation 430.
  • 5A and 5B illustrate a configuration example of a duplication mode frame according to an embodiment.
  • 5A shows a 2 MHz duplication mode frame.
  • the 2MHz duplication mode frame may include a base frame 510 and a duplication frame 520 that is 90 degrees out of phase with the base frame 510.
  • the same frame is shifted by 90 ° with respect to the DC tone and transmitted through two bands.
  • the process of transmitting the duplication mode frame may include transmitting the base frame through the first band and simultaneously transmitting the duplication frame through the second band.
  • the receiving end receiving the duplication mode frame may perform demodulation even when receiving only a frame received in one of the first band and the second band.
  • the basic frame 510 may have the same structure as the 1 MHz mode frame illustrated in FIG. 2. Accordingly, the basic frame 510 may include a short training field (STF), a long training field (LTF), and a SIG field.
  • STF short training field
  • LTF long training field
  • SIG SIG field
  • the SIG field of the 1 MHz mode frame may have a structure in which information on bandwidth is omitted.
  • the bandwidth When configuring a duplication mode frame based on 1 MHz bandwidth, it is necessary to insert information for defining the bandwidth. For example, some bits of 4 bits defined as reserved bits of the SIG may be used to insert information about bandwidth. In this case, the information on the bandwidth may be information on which band of the frequency axis is used in the example illustrated in FIG. 5A. In addition, some of the lower bits of the scrambler sheet in the SERVICE field may be used to define bandwidth information.
  • Three bits may be required to define the bandwidth divided into 1, 2, 4, 8, and 16 [MHz].
  • the 1MHz mode frame structure is a form in which information on multiple bandwidths is omitted, and the basic frame 510 generated based on the 1MHz mode frame may include information on multiple bandwidths in a signal field or a service field.
  • 5B shows a 4 MHz duplication mode frame.
  • the 4MHz duplication mode frame may include a base frame 510 and three duplication frames 530 that are 180 degrees out of phase with the base frame 510.
  • FIG. 6 is a diagram for describing an OMD transmission apparatus of a wireless LAN system according to an embodiment.
  • an OPM transmission apparatus 600 of a wireless LAN system includes a signal repeater 610, an interleaver 620, a modulator 630, a phase rotation unit 640, and a transmission. Part 650 is included.
  • the signal repeater 610 may perform the same function as the 2x block-wise repetition 330 of FIG. 3.
  • the signal repeater 610 repeats the encoded signal in units of blocks and outputs the encoded signal and the repeated signal together.
  • the encoded signal may be data for a bandwidth mode having the lowest signal-to-noise ratio among the plurality of bandwidths supported by the WLAN system.
  • the frame structure of the bandwidth mode with the lowest signal-to-noise ratio includes a base frame and a duplication frame that is out of phase with the base frame, and the base frame includes a short training field (STF) and a long training field. It may include a (Long Training Field, LTF) and a repetition coded signal field (repetition coded SIG field).
  • the interleaver 620 may perform the same function as the interleaver 340 of FIG. 3.
  • the interleaver 620 interleaves the encoded signal and the repeated signal to output an interleaved signal.
  • the modulator 630 may perform the same function as the BPSK 350 of FIG. 3.
  • the modulator 630 modulates the interleaved signal and outputs modulated symbols.
  • the phase rotation unit 640 may perform the same function as the phase rotation 360 of FIG. 3.
  • the phase rotation unit 640 changes the phase of the modulated symbols.
  • the phase rotation unit 640 may maintain the phase of the modulated symbols of the modulated symbols and change the phase of the modulated symbols of the modulated symbols.
  • the phase rotation unit 640 may maintain the phase of some symbols among the symbols for modulating the repeated signal and change the phase of the remaining symbols.
  • the phase rotation unit 640 may change the phase of the modulated symbols by 45 °, 90 °, 135 °, or 180 °.
  • the transmitter 650 may include an IFFT 370, a GI 380, and an analog 390 of FIG. 3.
  • the transmitter 650 may transmit a 1 MHz mode frame or may transmit a duplication mode frame illustrated in FIG. 5. Accordingly, the transmitter 650 may transmit the basic frame 510 illustrated in FIG. 5 through the first band and simultaneously transmit the duplication frame 520 through the second band.
  • FIG. 7 is a diagram for describing an OMD transmission apparatus of a wireless LAN system according to another embodiment.
  • an OMD transmission apparatus 700 of a WLAN system includes a signal repeater 710, a bit converting unit 720, an interleaver 730, a modulator 730, and The transmitter 750 is included.
  • the signal repeater 710 may perform the same function as the 2x block-wise repetition 330 of FIG. 3.
  • the signal repeater 710 repeats the encoded signal in units of blocks and outputs the encoded signal and the repeated signal together.
  • the encoded signal may be data for a bandwidth mode having the lowest signal-to-noise ratio among the plurality of bandwidths supported by the WLAN system.
  • the bit converting unit 720 converts the bit information of the repeated signal. As described in FIG. 3, bit conversion may be performed by an XOR operation.
  • the bit converting unit 720 may maintain the sign of some bits of the bit information of the repeated signal and convert the sign of the remaining bits.
  • the bit conversion unit 720 may XOR the repeated bit strings [ b1 b2 b3 b4 b5 b6 b7 b8 b9 b10 b11 b12] and [1 0 0 0 0 1 0 1 0 1 1 1]. .
  • the interleaver 730 may perform the same function as the interleaver 340 of FIG. 3.
  • the interleaver 730 interleaves the encoded signal and the signal in which the bit information is converted to output an interleaved signal.
  • the modulator 730 may perform the same function as the BPSK 350 of FIG. 3.
  • the modulator 730 modulates the interleaved signal and outputs modulated symbols.
  • the transmitter 750 may include an IFFT 370, a GI 380, and an analog 390 of FIG. 3.
  • the transmitter 750 may transmit a 1 MHz mode frame or may transmit a duplication mode frame illustrated in FIG. 5. Therefore, the transmitter 750 may transmit the basic frame 510 illustrated in FIG. 5 through the first band and simultaneously transmit the duplication frame 520 through the second band.
  • the method according to the embodiment may be embodied in the form of program instructions that can be executed by various computer means and recorded in a computer readable medium.
  • the computer readable medium may include program instructions, data files, data structures, etc. alone or in combination.
  • the program instructions recorded on the media may be those specially designed and constructed for the purposes of the embodiments, or they may be of the kind well-known and available to those having skill in the computer software arts.
  • Examples of computer readable recording media include magnetic media such as hard disks, floppy disks and magnetic tape, optical media such as CD-ROMs, DVDs, and magnetic disks such as floppy disks.
  • Examples of program instructions include not only machine code generated by a compiler, but also high-level language code that can be executed by a computer using an interpreter or the like.
  • the hardware device described above may be configured to operate as one or more software modules to perform the operations of the embodiments, and vice versa.

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  • Computer Networks & Wireless Communication (AREA)
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Abstract

L'invention concerne un dispositif et un procédé de transmission OFDM dans un système LAN sans fil. Un dispositif de transmission OFDM dans un système LAN sans fil, selon un mode de réalisation de la présente invention, comprend : une unité de répétition de signal, destinée à répéter un signal codé en unités de blocs et à produire à la fois le signal codé et un signal répété; un dispositif d'entrelacement destiné à produire un signal entrelacé par l'entrelacement du signal codé et du signal répété; une unité de modulation, destinée à produire des symboles modulés par modulation du signal entrelacé; et une unité de rotation de phase destinée à décaler les phases des symboles modulés.
PCT/KR2013/005376 2012-06-19 2013-06-19 Dispositif et procédé de transmission ofdm dans un système lan sans fil WO2013191449A1 (fr)

Priority Applications (5)

Application Number Priority Date Filing Date Title
US14/408,933 US9264274B2 (en) 2012-06-19 2013-06-19 OFDM transmission method and device in wireless LAN system
CN201380032658.4A CN104380678B (zh) 2012-06-19 2013-06-19 无线局域网系统的正交频分多路复用传送方法及装置
US15/017,035 US9912509B2 (en) 2012-06-19 2016-02-05 OFDM transmission method and device in wireless LAN system
US15/874,827 US10812309B2 (en) 2012-06-19 2018-01-18 OFDM transmission method and device in wireless LAN system
US17/022,962 US11463293B2 (en) 2012-06-19 2020-09-16 OFDM transmission method and device in wireless LAN system

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
KR10-2012-0065520 2012-06-19
KR20120065520 2012-06-19
KR10-2013-0069404 2013-06-18
KR1020130069404A KR20130142932A (ko) 2012-06-19 2013-06-18 무선랜 시스템의 오에프디엠 전송 방법 및 장치

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Application Number Title Priority Date Filing Date
US14/408,933 A-371-Of-International US9264274B2 (en) 2012-06-19 2013-06-19 OFDM transmission method and device in wireless LAN system
US15/017,035 Continuation US9912509B2 (en) 2012-06-19 2016-02-05 OFDM transmission method and device in wireless LAN system

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Citations (2)

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Publication number Priority date Publication date Assignee Title
US20070296616A1 (en) * 2004-07-26 2007-12-27 Kwang-Jae Lim Signal Transmitting and Receiving Device and Method of Mobile Communication System
WO2011084356A1 (fr) * 2009-12-17 2011-07-14 Texas Instruments Incorporated Diversité de fréquence et rotation de phase

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20070296616A1 (en) * 2004-07-26 2007-12-27 Kwang-Jae Lim Signal Transmitting and Receiving Device and Method of Mobile Communication System
WO2011084356A1 (fr) * 2009-12-17 2011-07-14 Texas Instruments Incorporated Diversité de fréquence et rotation de phase

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* Cited by examiner, † Cited by third party
Title
CARIOU, LAURENT: "DFT-spread OFDM optimized for 802.11ah", IEEE 802.11-11/0753R0, 10 May 2011 (2011-05-10), Retrieved from the Internet <URL:https://mentor.ieee.org/802.11/documents?is_dcn=0753&is_group=00ah> *
YU, HEE JUNG ET AL.: "Repetition Schemes For TGah", IEEE 802.11-11/1490R0, 7 November 2011 (2011-11-07), Retrieved from the Internet <URL:https://mentor.ieee.org/802.11/documents?is_dcn=1490&isgroup=00ah> *
ZHANG, HONGYUAN ET AL.: "11ah Data Transmission Flow", IEEE 802.11-11/1484RL, 8 November 2011 (2011-11-08), Retrieved from the Internet <URL:https://mentor.ieee.org/802.11/documents?is_dcn=1484&isgroup=00ah> *

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