公开(公告)号：US08842756B2

公开(公告)日：2014-09-23

申请号：US13665982

申请日：2012-11-01

Applicant: Apple Inc.

Inventor： Jianglei Ma ,  Ming Jia ,  Hua Xu ,  Wen Tong ,  Peiying Zhu ,  Dong-Sheng Yu ,  Hang Zhang

IPC: H04K1/10

CPC classification number: H04L27/2611 ,  H04B7/06 ,  H04B7/08 ,  H04L5/0007 ,  H04L5/0023 ,  H04L25/0226 ,  H04L25/0232 ,  H04L27/2626 ,  H04L27/2647

Abstract: 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).

Abstract translation: 一种用于改善OFDM通信系统内的信道估计的方法和装置。 OFDM中的信道估计通常借助于导频符号来执行。 导频符号通常在时间和频率上间隔开。 将导频符号插入的频率和时间的集合称为导频模式。 在一些情况下，导频图案是对角线形格子，规则的或不规则的。 该方法首先在较大相干性（时间或频率）的方向内插。 使用这些测量，导频符号在更快变化方向上的密度将增加，从而改善信道估计而不增加开销。 因此，第一内插步骤的结果然后可以用于辅助尺寸较小的相干性（时间或频率）的内插。

公开(公告)号：US20140226744A1

公开(公告)日：2014-08-14

申请号：US14257949

申请日：2014-04-21

Applicant: Apple Inc.

Inventor： Wen Tong ,  Ming Jia ,  Peiying Zhu ,  Alexandre M. Chloma ,  Mikhail G. Bakouline ,  Vitali B. Kreindeline

IPC: H04B7/04

CPC classification number: H04B7/0482 ,  H04B7/0417 ,  H04B7/0452 ,  H04B7/0626 ,  H04L1/0656 ,  H04L25/0248 ,  H04L25/03343 ,  H04L2025/03426

Abstract: Systems and methods of optimizing communication channels in multi-user communication systems are provided. Coding weights are determined based on communication channel state information for communication channels between a transmitter and multiple receivers. The coding weights are applied to communication signals to be transmitted from the transmitter to the receivers. Each receiver decodes received signals using inverses of the coding weights. Embodiments of the invention support multi-user MIMO (Multiple Input Multiple Output) where each receiver has fewer antennas than the transmitter, and enhance system performance if the total number of antennas at all of the receivers exceeds the number of antennas at the transmitter.

Abstract translation: 提供了在多用户通信系统中优化通信信道的系统和方法。 基于用于发射机和多个接收机之间的通信信道的通信信道状态信息来确定编码权重。 编码权重被应用于从发射机发射到接收机的通信信号。 每个接收机使用反编码权重来解码接收到的信号。 本发明的实施例支持多用户MIMO（多输入多输出），其中每个接收机具有比发射机更少的天线，并且如果所有接收机的天线总数超过发射机的天线数量，则增强系统性能。

公开(公告)号：US20140211778A1

公开(公告)日：2014-07-31

申请号：US14231595

申请日：2014-03-31

Applicant: Apple Inc.

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

IPC: H04L5/00 ,  H04B7/06 ,  H04B7/26

CPC classification number: H04L5/0058 ,  H04B7/0602 ,  H04B7/0671 ,  H04B7/2621 ,  H04J11/00 ,  H04L1/0003 ,  H04L1/0625 ,  H04L5/0007 ,  H04L5/0023 ,  H04L5/0044 ,  H04L5/0048 ,  H04L5/0091 ,  H04L27/2615 ,  H04L27/2626 ,  H04L27/2636

Abstract: The present application provides methods, devices and transmitters that mitigate increases in peak to average power ratio (PAPR) from transmission diversity in a single carrier frequency division multiple access (SC-FDMA) modulated uplink. A PAPR preserving precode matrix hopping method that utilizes cyclic shift delays is provided, as well as a sub-band based transmit diversity scheme. The present application also provides methods, devices and transmitters that relax the scheduling restrictions associated with uplink scheduling in the LTE standard.

Abstract translation: 本申请提供了在单载波频分多址（SC-FDMA）调制的上行链路中减轻来自传输分集的峰均功率比（PAPR）的增加的方法，装置和发射机。 提供了利用循环移位延迟的PAPR保留预编码矩阵跳频方法以及基于子带的发射分集方案。 本申请还提供了放宽与LTE标准中的上行链路调度相关联的调度限制的方法，设备和发射机。

公开(公告)号：US20140119471A1

公开(公告)日：2014-05-01

申请号：US13944022

申请日：2013-07-17

Applicant: Apple Inc.

Inventor： Jianglei Ma ,  Ming Jia ,  Wen Tong ,  Peiying Zhu ,  Hang Zhang ,  Hua Xu ,  Dong-Sheng Yu

IPC: H04L27/26

CPC classification number: H04L27/2611 ,  H04B7/06 ,  H04B7/08 ,  H04L5/0007 ,  H04L5/0023 ,  H04L25/0226 ,  H04L25/0232 ,  H04L27/2626 ,  H04L27/2647

Abstract: 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).

Abstract translation: 一种用于改善OFDM通信系统内的信道估计的方法和装置。 OFDM中的信道估计通常借助于导频符号来执行。 导频符号通常在时间和频率上间隔开。 将导频符号插入的频率和时间的集合称为导频模式。 在一些情况下，导频图案是对角线形格子，规则的或不规则的。 该方法首先在较大相干性（时间或频率）的方向内插。 使用这些测量，导频符号在更快变化方向上的密度将增加，从而改善信道估计而不增加开销。 因此，第一内插步骤的结果然后可以用于辅助尺寸较小的相干性（时间或频率）的内插。

公开(公告)号：US20130301761A1

公开(公告)日：2013-11-14

申请号：US13944010

申请日：2013-07-17

Applicant: Apple Inc.

Inventor： Jianglei Ma ,  Ming Jia ,  Wen Tong ,  Peiying Zhu ,  Hang Zhang ,  Mo-Han Fong

IPC: H04L27/26

CPC classification number: H04L5/0051 ,  H04L1/0003 ,  H04L1/0009 ,  H04L1/0618 ,  H04L5/0007 ,  H04L5/0023 ,  H04L5/0048 ,  H04L5/005 ,  H04L25/02 ,  H04L27/2602 ,  H04L27/2613 ,  H04L27/2647 ,  H04W52/325

Abstract: Aspects of the invention include methods and devices for inserting data and pilot symbols into Orthogonal Frequency Division Multiplexing (OFDM) frames having a time domain and a frequency domain. A method involves inserting in at least one zone of a first type a two dimensional array of data and pilot symbols in time and frequency and inserting in at least one zone of a second type a two dimensional array of data and pilot symbols in time and frequency. In some implementations the zone of the first type comprises common pilot symbols that can be detected by all receivers receiving the OFDM frame. In some implementations the zone of the second type comprises dedicated pilot symbols that are only detectable by a receiver that is aware of pre-processing used to encode the dedicated pilot symbols.

Abstract translation: 本发明的方面包括用于将数据和导频符号插入具有时域和频域的正交频分复用（OFDM）帧的方法和装置。 一种方法包括在时间和频率上插入数据和导频符号的二维阵列的第一类型的至少一个区域，并在第二类型的至少一个区域中插入时间和频率的数据和导频符号的二维阵列 。 在一些实现中，第一类型的区域包括可由接收OFDM帧的所有接收机检测的公共导频符号。 在一些实施方式中，第二类型的区域包括专用导频符号，其仅可以被知道用于对专用导频符号进行编码的预处理的接收机检测。

公开(公告)号：US20130301510A1

公开(公告)日：2013-11-14

申请号：US13784158

申请日：2013-03-04

Applicant: Apple Inc.

Inventor： Hang Zhang ,  Jianglei Ma ,  Ming Jia ,  Mo-Han Fong ,  Peiying Zhu ,  Wen Tong

IPC: H04W72/00

CPC classification number: H04W72/0406 ,  H04B7/0413 ,  H04L1/1887 ,  H04L5/023 ,  H04L12/185 ,  H04L27/2627 ,  H04L61/2069 ,  H04W4/08 ,  H04W48/10 ,  H04W72/005 ,  H04W72/04 ,  H04W74/004 ,  H04W74/006 ,  Y02D30/30

Abstract: A method and system for allocating shareable wireless transmission resources. A resource pool is established. The resource pool is divided into a plurality of physical layer allocation units usable for wirelessly transmitting control information and traffic data. The allocation units are assigned at the media access control layer for the wireless transmission of the control information and traffic data. The system and method of the present invention also allows mobile stations to be dynamically grouped into multicast groupings to reduce system overhead resource requirements.

公开(公告)号：US20130034049A1

公开(公告)日：2013-02-07

申请号：US13649811

申请日：2012-10-11

Applicant: APPLE INC.

Inventor： Ming Jia ,  Jianglei Ma ,  Peiying Zhu ,  Wen Tong ,  Curt Dodd

IPC: H04B7/14 ,  H04W72/04

CPC classification number: H03C3/00 ,  H04L25/0226 ,  H04L27/3488

Abstract: The present invention employs hierarchical modulation to simultaneously transmit information on different modulation layers using a carrier RF signal. Initially, first data to be transmitted is assigned to a first modulation layer and second data is assigned to a second modulation layer. In one embodiment of the present invention, the first and second data are assigned based on reliability criteria. The first and second modulation layers are hierarchical modulation layers of the carrier RF signal. Once assigned, the first data is transmitted using the first modulation layer of the carrier RF signal and the second data is transmitted using the second modulation layer of the carrier RF signal. In one embodiment of the present invention, information may be transmitted to one end user using one modulation layer, and information may be transmitted to a different end user using a different modulation layer.

Abstract translation: 本发明采用层次调制，使用载波RF信号同时发送不同调制层上的信息。 首先，要发送的第一数据被分配给第一调制层，并且第二数据被分配给第二调制层。 在本发明的一个实施例中，基于可靠性标准来分配第一和第二数据。 第一和第二调制层是载波RF信号的分层调制层。 一旦被分配，使用载波RF信号的第一调制层发送第一数据，并且使用载波RF信号的第二调制层发送第二数据。 在本发明的一个实施例中，可以使用一个调制层向一个终端用户发送信息，并且可以使用不同的调制层向不同的终端用户发送信息。