公开(公告)号：US10700905B2

公开(公告)日：2020-06-30

申请号：US16666650

申请日：2019-10-29

Applicant: Apple Inc.

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

IPC: H04L27/26 ,  H04W52/32 ,  H04L25/02 ,  H04L5/00 ,  H04B7/08 ,  H04B7/06 ,  H04L1/06 ,  H04L1/00

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).

公开(公告)号：US10686512B2

公开(公告)日：2020-06-16

申请号：US15796071

申请日：2017-10-27

Applicant: APPLE INC.

Inventor： Jianglei Ma ,  Ming Jia ,  Jianming Wu ,  Peiying Zhu ,  Wen Tong ,  Evelyne Le Strat ,  Sarah Boumendil ,  Moussa Abdi

IPC: H04B7/06 ,  H04B7/0452

Abstract: Spatial multiplexing and transmit diversity can improve the capacity of a wireless communication system. The system and method adapts communication schemes for communication systems with multiple antennas utilizing at least two transmission modes. The at least two transmission modes can, but are not necessarily, used for uplink communications. The two transmission modes may be chosen from the group consisting of a single antenna mode, a diversity mode a spatial multiplexed mode and a mixed diversity and spatial multiplexed mode. The at least two transmission modes may involve adaptation among multiple transmitters. At least one receiver may indicate a transmission mode to be used by a transmitter for a subsequent transmission. A transmitter may determine a transmission mode to be used for a subsequent transmission. The transmission mode can be based on channel sounding.

公开(公告)号：US20200177246A1

公开(公告)日：2020-06-04

申请号：US16786679

申请日：2020-02-10

Applicant: Apple Inc.

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

IPC: H04B7/0452 ,  H04W72/04 ,  H04J13/18 ,  H04L5/00 ,  H04W88/08 ,  H04B7/0413 ,  H04L27/26

Abstract: 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.

公开(公告)号：US20200162138A1

公开(公告)日：2020-05-21

申请号：US16749687

申请日：2020-01-22

Applicant: APPLE INC.

Inventor： Hang ZHANG ,  Mo-Han Fong ,  Peiying Zhu ,  Jianglei Ma ,  Wen Tong

IPC: H04B7/0456 ,  H04B7/0413 ,  H04W74/06 ,  H04W72/08 ,  H04W72/04 ,  H04W48/08 ,  H04L5/02 ,  H04L5/00 ,  H04B7/06

Abstract: Aspects of the present invention provide additional MAC functionality to support the PHY features of a wireless communication system framework. The additional MAC functionality aids in enabling feedback from wireless terminals to base stations. In some aspects of the invention the feedback is provided on an allocated feedback channel. In other aspects of the invention the feedback is provided by MAC protocol data units (PDU) in a header, mini-header, or subheader. The feedback may be transmitted from the wireless terminal to the base station autonomously by the wireless terminal or in response to an indication from the base station that feedback is requested. Aspects of the invention also provide for allocating feedback resources to form a dedicated feedback channel. One or more of these enhancements is included in a given implementation. Base stations and wireless terminals are also described upon which methods described herein can be implemented.

公开(公告)号：US10554272B2

公开(公告)日：2020-02-04

申请号：US15486060

申请日：2017-04-12

Applicant: APPLE INC.

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

IPC: H04B7/0456 ,  H04B7/06 ,  H04L5/00 ,  H04W48/08 ,  H04B7/0413 ,  H04W72/04 ,  H04L5/02 ,  H04W72/08 ,  H04W74/06 ,  H04L27/26

Abstract: Systems and methods for closed loop MIMO (multiple input and multiple output) wireless communication are provided. Various transmit formats including spatial multiplexing and STTD are defined in which vector or matrix weighting is employed using information fed back from receivers. The feedback information may include channel matrix or SVD-based feedback.

公开(公告)号：US20200037300A1

公开(公告)日：2020-01-30

申请号：US16593326

申请日：2019-10-04

Applicant: Apple Inc.

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

IPC: H04W72/04 ,  H04W72/00 ,  H04L12/18 ,  H04W4/08 ,  H04W48/10 ,  H04B7/0413 ,  H04L1/18 ,  H04L27/26 ,  H04L29/12 ,  H04W74/00

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：US10374667B2

公开(公告)日：2019-08-06

申请号：US14496001

申请日：2014-09-25

Applicant: Apple Inc.

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

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

Abstract: 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.

公开(公告)号：US10277374B2

公开(公告)日：2019-04-30

申请号：US15806923

申请日：2017-11-08

Applicant: Apple Inc.

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

IPC: H04L5/00 ,  H04W52/32 ,  H04L27/26 ,  H04L25/02 ,  H04L1/00 ,  H04L1/06

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.

公开(公告)号：US10244529B2

公开(公告)日：2019-03-26

申请号：US15681557

申请日：2017-08-21

Applicant: Apple Inc.

Inventor： Hang Zhang ,  Jianglei Ma ,  Ming Jia ,  Sophie Vrzic ,  Mo-Han Fong ,  Dong-Sheng Yu ,  Hua Xu

IPC: H04W72/04 ,  H04B7/12 ,  H04L1/00 ,  H04L5/00 ,  H04L25/02 ,  H04L27/26 ,  H04L29/06 ,  H04B7/06 ,  H04L1/06 ,  H04L1/18 ,  H04L25/03 ,  H04B7/02

Abstract: Systems and methods for OFDM channelization are provided that allow for the coexistence of sub-band channels and diversity channels. Methods of defining diversity sub-channels and sub-band sub-channels are provided and systematic channel definition and labeling schemes are provided.

公开(公告)号：US20190036576A1

公开(公告)日：2019-01-31

申请号：US16151636

申请日：2018-10-04

Applicant: Apple Inc.

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

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

Abstract: 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.