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    Multi-user (MU) wake-up signal transmission by using FDMA scheme in WLAN
    3.
    发明授权
    Multi-user (MU) wake-up signal transmission by using FDMA scheme in WLAN 有权

    公开(公告)号：US10470125B2

    公开(公告)日：2019-11-05

    申请号：US15852548

    申请日：2017-12-22

    Applicant: MEDIATEK INC.

    Inventor： Jianhan Liu ,  Thomas Edward Pare, Jr. ,  Keng Leong Fong

    IPC: H04W52/02 ,  H04L27/10 ,  H04W74/00 ,  H04W84/12

    Abstract: Systems and methods of transmitting a multi-user (MU) wake-up packet in WLAN including wake-up signals to activate main radios on multiple communication devices via the wake-up radios (WURs). In the multi-user wake-up packet, a frequency channel can be divided into several sub-channels for transmitting multiple wake-up signals in FDMA. Each wake-up signal is modulated in ON/OFF Key modulation. Two adjacent wake-up signals are adequately spaced apart by a certain frequency spacing to reduce adjacent channel interferences. Once a WUR on a receive device receives the packet, it generates a wake-up indication to wake up the main radio for active data communication. The MU wake-up packet may also include a sequence of multiple wake-up signals transmitted using the same sub-channel and cascaded in a time-domain. A reconfiguration window may be inserted between consecutive wake-up signals on the same sub-channel, and between a legacy preamble and the following wakeup signals.

    Low PAPR dual sub-carrier modulation scheme for BPSK in WLAN
    4.
    发明授权
    Low PAPR dual sub-carrier modulation scheme for BPSK in WLAN 有权

    公开(公告)号：US10225122B2

    公开(公告)日：2019-03-05

    申请号：US15422755

    申请日：2017-02-02

    Applicant: MEDIATEK INC.

    Inventor： Gary A. Anwyl ,  Jianhan Liu ,  Tianyu Wu ,  Thomas Edward Pare, Jr.

    IPC: H04L27/26 ,  H04L1/00 ,  H04W84/12

    Abstract: Dual sub-carrier modulation (DCM) is introduced in high efficiency (HE) WLAN. DCM is a solution to deal with narrow band interferences and for range extension. DCM can introduce frequency diversity into OFDM systems by transmitting the same information on two subcarriers separated in frequency. If DCM is applied, then the transmitter modulates the same encoded bits onto two separated subcarriers with the same or different constellation mapping schemes. DCM suffers from a high peak-to-average power ratio (PAPR). In accordance with one novel aspect, a method of transmitting and encoding a HE PPDU frame with binary phase shift keying (BPSK) DCM and lower PAPR is proposed.

    HE SIG B common field formats and indication
    7.
    发明授权
    HE SIG B common field formats and indication 有权

    公开(公告)号：US10264580B2

    公开(公告)日：2019-04-16

    申请号：US15259008

    申请日：2016-09-07

    Applicant: MEDIATEK INC.

    Inventor： Tianyu Wu ,  Shengquan Hu ,  Jianhan Liu ,  Thomas Edward Pare, Jr.

    IPC: H04L5/00 ,  H04W72/04 ,  H04B7/0452

    Abstract: Methods and apparatus are provided for HE-SIG-B common field formats and indications. In one novel aspect, a fixed format is used for HE-SIG-B common field indicating resource allocations (RA). In one embodiment, look-up tables (LUT) are configured for the resource allocation and indicated in the HE-SIG-B common field. In one embodiment, one or more RA LUTs are used based on the operation bandwidth. The RA LUTs are placed in an order of channel indexes from lower channel to upper channel signaled in each corresponding RA LUT. In another novel aspect, MU-MIMO is used for operation bandwidth of 160 MHz and a compression indicator is set in the HE-SIG-A field indicating a saving of all RA LUTS in the HE-SIG-B common field. In yet another novel aspect, a one-bit middle-tone indicator is included in the HE-SIG-B common field indicating whether the one or more middle 26 tone is used.

    Interleaver design for dual sub-carrier modulation in WLAN
    9.
    发明授权
    Interleaver design for dual sub-carrier modulation in WLAN 有权

    公开(公告)号：US10200228B2

    公开(公告)日：2019-02-05

    申请号：US15381109

    申请日：2016-12-16

    Applicant: MEDIATEK INC.

    Inventor： Tianyu Wu ,  Jianhan Liu ,  Gary A. Anwyl ,  Thomas Edward Pare, Jr.

    IPC: H04L27/26 ,  H04L1/00 ,  H04L1/04 ,  H04L1/08 ,  H04W84/12

    Abstract: A method of interleaver design for dual carrier modulation (DCM) is proposed in a wireless network. For HE PPDU transmission with DCM, information bits are first encoded by a BCC encoder. The BCC encoded bit streams are then interleaved by a BCC interleaver. More specifically, the BCC interleaved bits are repeated on two halves of a given resource unit (RU). The BCC interleaver parameters are defined based on half of the total number of the data tones of the RU if DCM is applied. The BCC interleaved bits are then modulated and mapped to two halves of the RU by a DCM constellation mapper.

    Burst OFDMA supporting MU-MIMO
    10.
    发明授权
    Burst OFDMA supporting MU-MIMO 有权

    公开(公告)号：US09780926B2

    公开(公告)日：2017-10-03

    申请号：US14833072

    申请日：2015-08-22

    Applicant: MEDIATEK INC.

    Inventor： Yuh-Ren Jauh ,  Jianhan Liu ,  Chao-Chun Wang ,  James June-Ming Wang ,  Thomas Edward Pare, Jr.

    IPC: H04W4/00 ,  H04L5/00 ,  H04B7/0452

    CPC classification number: H04L5/0007 ,  H04B7/0452 ,  H04L5/0055

    Abstract: Methods and apparatus are provided for burst OFDMA support MU-MIMO in the WLAN network. In one novel aspect, pluralities of user channels are configured for a downlink wideband channel, wherein each user channel is associated with a user group selecting from a SU-SISO, or a SU-MIMO or a MU-MIMO. In one embodiment, the SIG1 and SIG2 signaling fields are independent for each user channel. In another embodiment, the SIG1 fields are duplicates for all user channels carrying common information. The SIG2 fields for each user group are different from each other carrying user group specific information. In another novel aspect, an uplink OFDMA frames contains ACK packets from multiple STAs concurrently using an uplink wideband channel. In one embodiment, one ACK packet is sent for a MU-MIMO user group. In another embodiment, the uplink ACK packet assignment is based on indications in the downlink PHY SIG field.

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