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205 条记录 (耗时 0.035 秒)

    Method and system for combining DFT-transformed OFDM and non-transformed OFDM
    1.
    发明授权
    Method and system for combining DFT-transformed OFDM and non-transformed OFDM 有权

    公开(公告)号：US11032119B2

    公开(公告)日：2021-06-08

    申请号：US16780620

    申请日：2020-02-03

    申请人： Apple Inc.

    发明人： Jianglei Ma ,  Wen Tong ,  Ming Jia ,  Hua Xu ,  Peiying Zhu ,  Hang Zhang

    IPC分类号： H04W84/12 ,  H04L5/00 ,  H04L27/26 ,  H04L1/00

    摘要： Methods and systems are provided that enable an OFDM transmitter to be used for transmitting conventional OFDM or a form of transformed OFDM. A technique is provided for transforming a coded and modulated sequence of samples prior to an IFFT that enables the transformed sequence of samples to be transmitted using conventional OFDM or transformed OFDM. The selection of a transform function for transforming the coded and modulated sequence of samples may be based on optimizing the transform function for particular operating conditions between the transmitter and receiver. In some embodiments of the invention OFDM and time transformed OFDM are multiplexed in time and/or frequency in a transmission frame. In some embodiments of the invention a pilot pattern is provided in which the pilot are sent using OFDM and data is sent using OFDM and/or transformed OFDM.

    Communication resource allocation systems and methods
    2.
    发明授权
    Communication resource allocation systems and methods 有权

    公开(公告)号：US10959227B2

    公开(公告)日：2021-03-23

    申请号：US15823120

    申请日：2017-11-27

    申请人： APPLE INC.

    发明人： Hang Zhang ,  Mo-Han Fong ,  Peiying Zhu ,  Wen Tong ,  Jianglei Ma

    IPC分类号： H04W72/04 ,  H04L5/00 ,  H04W28/06 ,  H04L27/26

    摘要： A channel descriptor management message is transmitted on a broadcast connection to a mobile terminal. The channel descriptor management message provides a format for a frame. The frame includes a resource space. The channel descriptor management message defines a plurality of channels within the resource space and allocates at least one of the channels to a plurality of users. Subsequent resource allocation messages may refer to a location within a channel rather than a location within the entire resource space.

    Methods and Systems for OFDM Using Code Division Multiplexing
    3.
    发明申请
    Methods and Systems for OFDM Using Code Division Multiplexing 审中-公开

    公开(公告)号：US20200119827A1

    公开(公告)日：2020-04-16

    申请号：US16716845

    申请日：2019-12-17

    申请人： Apple Inc.

    发明人： Jianglei Ma ,  Ming Jia ,  Wen Tong ,  Peiying Zhu ,  Hua Xu ,  Hang Zhang ,  Mo-Han Fong

    IPC分类号： H04J13/00 ,  H04L5/00 ,  H04W72/04 ,  H04L27/26 ,  H04B7/0404 ,  H04B1/707 ,  H04L25/02 ,  H04B7/06

    摘要： In some embodiments of the invention, OFDM symbols are transmitted as a plurality of clusters. A cluster includes a plurality of OFDM sub-carriers in frequency, over a plurality of OFDM symbol durations in time. Each cluster includes data as well as pilot information as a reference signal for channel estimation. In some embodiments, a plurality of clusters collectively occupy the available sub-carrier set in the frequency domain that is used for transmission. In some embodiments of the invention data and/or pilots are spread within each cluster using code division multiplexing (CDM). In some embodiments pilots and data are separated by distributing data on a particular number of the plurality of OFDM symbol durations and pilots on a remainder of the OFDM symbol durations. CDM spreading can be performed in time and/or frequency directions.

    Pilot scheme for a MIMO communication system
    5.
    发明授权
    Pilot scheme for a MIMO communication system 有权

    公开(公告)号：US10560159B2

    公开(公告)日：2020-02-11

    申请号：US16151636

    申请日：2018-10-04

    申请人： Apple Inc.

    发明人： Jianglei Ma ,  Ming Jia ,  Hua Xu ,  Wen Tong ,  Peiying Zhu ,  Moussa Abdi

    IPC分类号： H04W4/00 ,  H04B7/0452 ,  H04L5/00 ,  H04L27/26 ,  H04W72/04 ,  H04B7/0413 ,  H04W88/08 ,  H04J13/18 ,  H04L1/06 ,  H04L25/02 ,  H04J13/16

    摘要： The present invention employs a pilot scheme for frequency division multiple access (FDM) communication systems, such as single carrier FDM communication systems. A given transmit time interval will include numerous traffic symbols and two or more short pilot symbols, which are spaced apart from one another by at least one traffic symbol and will have a Fourier transform length that is less than the Fourier transform length of any given traffic symbol. Multiple transmitters will generate pilot information and modulate the pilot information onto sub-carriers of the short pilot symbols in an orthogonal manner. Each transmitter may use different sub-carriers within the time and frequency domain, which is encompassed by the short pilot symbols within the transmit time interval. Alternatively, each transmitter may uniquely encode the pilot information using a unique code division multiplexed code and modulate the encoded pilot information onto common sub-carriers of the short pilot symbols.

    Pilot Symbol Patterns for Transmission through a Plurality of Antennas
    7.
    发明申请
    Pilot Symbol Patterns for Transmission through a Plurality of Antennas 审中-公开

    公开(公告)号：US20190288893A1

    公开(公告)日：2019-09-19

    申请号：US16433273

    申请日：2019-06-06

    申请人： Apple Inc.

    发明人： Jianglei Ma ,  Ming Jia ,  Wen Tong ,  Peiying Zhu ,  Hang Zhang ,  Hua Xu ,  Dongsheng Yu

    IPC分类号： H04L27/26 ,  H04L25/02 ,  H04L5/00 ,  H04B7/06 ,  H04B7/08 ,  H04W52/32

    摘要： A method and apparatus for improving channel estimation within an OFDM communication system. Channel estimation in OFDM is usually performed with the aid of pilot symbols. The pilot symbols are typically spaced in time and frequency. The set of frequencies and times at which pilot symbols are inserted is referred to as a pilot pattern. In some cases, the pilot pattern is a diagonal-shaped lattice, either regular or irregular. The method first interpolates in the direction of larger coherence (time or frequency). Using these measurements, the density of pilot symbols in the direction of faster change will be increased thereby improving channel estimation without increasing overhead. As such, the results of the first interpolating step can then be used to assist the interpolation in the dimension of smaller coherence (time or frequency).

    Uplink Control in a Wireless Communication Network
    9.
    发明申请
    Uplink Control in a Wireless Communication Network 审中-公开

    公开(公告)号：US20190254027A1

    公开(公告)日：2019-08-15

    申请号：US16391582

    申请日：2019-04-23

    申请人： Apple Inc.

    发明人： Sophie Vrzic ,  Jun Yuan ,  Mo-Han Fong ,  Robert Novak ,  Dong-Sheng Yu ,  Jianglei Ma

    IPC分类号： H04W72/04 ,  H04J11/00 ,  H04L5/00 ,  H04L27/26 ,  H04W74/00 ,  H04W74/08

    摘要： A method and system are provided having an uplink control structure and a pilot signal having minimal signal overhead for providing channel estimation and data demodulation in a wireless communication network. The uplink control structures enable mobile terminals to communicate with corresponding base stations to perform various functions including obtaining initial system access, submitting a bandwidth request, triggering a continuation of negotiated service, or providing a proposed allocation re-configuration header. A dedicated random access channel is provided to communicatively couple the base station and the mobile terminal so that the mobile terminal can select a random access signaling identification. A resource request is received at the base station to uplink resource information from the mobile terminal and an initial access information request is received from the mobile terminal to configure the base station connection. Pilot signals with varying density configurations are provided to include low density symbol patterns for multiple contiguous resource blocks and high density symbol patterns for single resource blocks.