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    Systems and methods to reduce peak to average power ratio for dual sub-carrier modulated transmissions in a wireless network
    1.
    发明授权
    Systems and methods to reduce peak to average power ratio for dual sub-carrier modulated transmissions in a wireless network 有权

    公开(公告)号：US10735236B1

    公开(公告)日：2020-08-04

    申请号：US16571406

    申请日：2019-09-16

    Applicant: Marvell International LTD.

    Inventor： Jie Huang ,  Hongyuan Zhang ,  Yakun Sun ,  Rui Cao

    IPC: G08C17/00 ,  H04L27/26 ,  H04L27/18 ,  H04W84/12

    Abstract: A system includes a modulator to modulate data using Quadrature Phase Shift Keying modulation and dual sub-carrier modulation to generate modulated symbols for transmission on a plurality of subcarriers. A repetition module repeats the modulated symbols from a first half of the plurality of subcarriers to a second half of the plurality of subcarriers. A phase rotation module rotates phase of the modulated symbols on selected subcarriers of the second half of the plurality of subcarriers. The selected subcarriers include all of the second half of the plurality of subcarriers. The phase rotation module rotates the phase of the modulated symbols on all of the second half of the plurality of subcarriers to conjugate the modulated symbols on all of the second half of the plurality of subcarriers relative to corresponding modulated symbols on all of the first half of the plurality of subcarriers.

    Systems and methods to reduce peak to average power ratio for dual sub-carrier modulated transmissions in a wireless network
    2.
    发明授权
    Systems and methods to reduce peak to average power ratio for dual sub-carrier modulated transmissions in a wireless network 有权

    公开(公告)号：US10439854B1

    公开(公告)日：2019-10-08

    申请号：US16151870

    申请日：2018-10-04

    Applicant: Marvell International LTD.

    Inventor： Jie Huang ,  Hongyuan Zhang ,  Yakun Sun ,  Rui Cao

    IPC: G08C17/00 ,  H04L27/26 ,  H04L27/18 ,  H04W84/12

    Abstract: A system includes a modulator to modulate data using Quadrature Phase Shift Keying modulation and dual sub-carrier modulation to generate modulated symbols for transmission on a plurality of subcarriers. A repetition module repeats the modulated symbols from a first half of the plurality of subcarriers to a second half of the plurality of subcarriers. A phase rotation module rotates phase of the modulated symbols on selected subcarriers of the second half of the plurality of subcarriers. The selected subcarriers include all of the second half of the plurality of subcarriers. The phase rotation module rotates the phase of the modulated symbols on all of the second half of the plurality of subcarriers to conjugate the modulated symbols on all of the second half of the plurality of subcarriers relative to corresponding modulated symbols on all of the first half of the plurality of subcarriers.

    Carrier frequency offset estimation
    4.
    发明授权
    Carrier frequency offset estimation 有权

    公开(公告)号：US10243711B1

    公开(公告)日：2019-03-26

    申请号：US15334550

    申请日：2016-10-26

    Applicant: Marvell International Ltd.

    Inventor： Rui Cao ,  Xiayu Zheng ,  Hongyuan Zhang ,  Hui-Ling Lou ,  Liwen Chu ,  Yakun Sun

    IPC: H04W52/54 ,  H04W56/00 ,  H04L25/02 ,  H04L27/26 ,  H04L5/00 ,  H04W72/04 ,  H04B7/0413

    Abstract: A first communication device receives, from a second communication device, a synchronization frame having an allocation indicator that indicates a non-overlapping allocation of pilot tones. The first communication device generates a first data frame that comprises a plurality of orthogonal frequency division multiplexing (OFDM) symbols of a non-legacy training field portion, the plurality of OFDM symbols including only pilot tones corresponding to the non-overlapping allocation of pilot tones. The first communication device transmits, in response to the synchronization frame and via a multiple input, multiple output (MIMO) communication channel, the first data frame to the second communication device simultaneously with a transmission of a second data frame by a third communication device via the MIMO communication channel, wherein corresponding OFDM symbols of respective non-legacy training field portions of the first data frame and the second data frame include non-overlapping pilot tones according to the non-overlapping allocation.

    Systems and methods for carrier sensing and symbol timing based on multi-antenna eigen-vector combining
    9.
    发明授权
    Systems and methods for carrier sensing and symbol timing based on multi-antenna eigen-vector combining 有权

    公开(公告)号：US10660128B1

    公开(公告)日：2020-05-19

    申请号：US16123037

    申请日：2018-09-06

    Applicant: Marvell International Ltd.

    Inventor： Rui Cao ,  Xiayu Zheng

    IPC: H04W74/08 ,  H04L27/26 ,  H04B7/06 ,  H04B7/0413

    Abstract: Systems and methods for carrier sensing and symbol timing in a multiple-antenna communication system are provided. A wireless receiver receives two or more signals from two or more antennas, respectively. A set of column vectors comprising time samples obtained from each of the received signals at the two or more antennas are generated. A multiple-antenna eigen-combining (MAEC) vector is computed based on the set of column vectors. The respective received signals are multiplied with a corresponding combining coefficient of the MAEC vector to obtain a respective weighted signal. A combined signal is generated by adding the respective weighted signals and carrier sensing and symbol timing is performed on the two or more received signals based on the combined signal.

    Training sequences in wireless communication systems
    10.
    发明授权
    Training sequences in wireless communication systems 有权

    公开(公告)号：US10159043B1

    公开(公告)日：2018-12-18

    申请号：US15221438

    申请日：2016-07-27

    Applicant: Marvell International Ltd.

    Inventor： Rui Cao ,  Yakun Sun ,  Hongyuan Zhang

    IPC: H04L27/26 ,  H04W52/02 ,  H04L5/00 ,  H04W84/12

    Abstract: The present disclosure includes systems and techniques relating to training sequences used in wireless communication systems. In some implementations, a transmission mode of a transmitting device is determined for transmitting a long training field (LTF) sequence for High Efficiency (HE) wireless local area network (WLAN) communication. Based on the transmission mode, candidate training sequences for the LTF sequence are constructed. Each candidate sequence includes a first number of base sequences and a second number of floating sequences, wherein the base sequences reuse an LTF sequence for Very High Throughput (VHT) WLAN communication. The candidate training sequences are constructed by varying values and locations of the floating sequences. A target training sequence is selected that has a desired peak-to-average power ratio (PAPR) value. The target training sequence is assigned to the transmitting device for transmitting the target training sequence in the LTF for the HE WLAN communication.

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