利索-全球专利检索

  1. 登录
  2. 注册

搜索结果

378 条记录 (耗时 0.032 秒)

    SIGNAL IDENTIFICATION FOR MULTI-CHANNEL AND MULTI-PROTOCOL COMMUNICATIONS
    2.
    发明公开
    SIGNAL IDENTIFICATION FOR MULTI-CHANNEL AND MULTI-PROTOCOL COMMUNICATIONS 审中-公开

    公开(公告)号：US20240187036A1

    公开(公告)日：2024-06-06

    申请号：US18073028

    申请日：2022-12-01

    申请人： Silicon Laboratories Inc.

    发明人： Qiang Li ,  Yan Zhou

    IPC分类号： H04B1/7103

    CPC分类号： H04B1/7103

    摘要： Techniques for quickly and accurately determining whether a channel is being used for transmission of data using one of a plurality of communications protocols for low power signals using random data of a packet are disclosed. The techniques increase sensitivity and reduce the false alarm rate for a wide range of signal and noise levels. A noise detection technique uses an adaptive window size for fast noise detection that increases the rate of scanning channels during a signal identification period. In a BLE1M detection mode, detection of clusters of zero frequency deviation are used to reduce the false detection rate. Adaptive Zigbee symbol detection improves detection sensitivity beyond −97 dBm. The techniques use a chip-based differential to generate frequency deviation samples for Zigbee detection or data filtering frequency deviation samples generated using sample-based differentials based on an oversampled received signal to improve the signal-to-noise ratio.

    Systems and methods for OFDM duobinary transmission
    3.
    发明授权
    Systems and methods for OFDM duobinary transmission 有权

    公开(公告)号：US11863366B2

    公开(公告)日：2024-01-02

    申请号：US17409522

    申请日：2021-08-23

    申请人： CABLE TELEVISION LABORATORIES, INC.

    发明人： Thomas Holtzman Williams ,  Lin Cheng

    IPC分类号： H04L27/26 ,  H04B1/7103 ,  H04L27/00 ,  H04L27/34 ,  H04W72/30

    CPC分类号： H04L27/2636 ,  H04B1/7103 ,  H04L27/0008 ,  H04L27/3405 ,  H04W72/30

    摘要： A method of modulating a series of input digital symbols of a first modulation scheme is provided. The method is implemented by a transmitter and includes receiving a sequential series of samples of the digital symbols in a first domain of the first modulation scheme. The first domain is one of the time domain and the frequency domain. The method further includes determining a dual of the first modulation scheme. The dual has a second modulation scheme in a second domain that is different from the first domain the second domain is the other of the time domain and the frequency domain. The method further includes applying a 90 degree rotational operation to the second modulation scheme to generate a rotational modulation format, modulating the series of digital symbols with the generated rotational modulation format, and outputting the modulated series of digital symbols to a receiver.

    System and method for generating spreaded sequence with low peak-to-average power ratio (PAPR) waveform
    5.
    发明授权
    System and method for generating spreaded sequence with low peak-to-average power ratio (PAPR) waveform 有权

    公开(公告)号：US11489707B2

    公开(公告)日：2022-11-01

    申请号：US16983215

    申请日：2020-08-03

    申请人： WISIG NETWORKS PRIVATE LIMITED

    发明人： Kiran Kumar Kuchi

    IPC分类号： H04B1/69 ,  H04L27/26 ,  H04B1/7103 ,  H04L5/00 ,  H04L25/03

    摘要： Embodiments of the present disclosure relate to a method and system to generate a waveform in a communication network. The transmitter receives an input data and transmit a generated waveform to another communication system. The input data is spread with a spread code to generate a spread data and rotated using a constellation rotation operation to produce a rotated data. The rotated data is then precoded using precoding filter to produce a precoded data, and transformed into DFT output data using DFT operation. The DFT output data is then mapped with subcarriers to generate the sub-carrier mapped DFT data and modulated using Orthogonal Frequency Division Multiplexing (OFDM) modulation to generate the waveform with low PAPR.

    RECEPTION OF SIGNALS WITH UNPREDICTABLE TRANSMISSION PROPERTIES IN WIRELESS M2M NETWORKS
    7.
    发明申请
    RECEPTION OF SIGNALS WITH UNPREDICTABLE TRANSMISSION PROPERTIES IN WIRELESS M2M NETWORKS 有权

    公开(公告)号：US20210160670A1

    公开(公告)日：2021-05-27

    申请号：US17170495

    申请日：2021-02-08

    申请人： Brian G. Agee

    发明人： Brian G. Agee

    IPC分类号： H04W4/70 ,  H04B1/692 ,  H04J13/00 ,  H04B1/7103 ,  H04B1/7156

    摘要： A method and apparatus for reception of signals with unpredictable transmission properties enabling physically secure, unscheduled and interference-resistant communication over machine-to-machine (M2M) networks is claimed. A physical structure comprising combinations of unpredictable physical dwells, spreading vectors, and selection of intended receivers is described. Reception methods employing blind detection and signal separation techniques are then described, which can detect and extract transmissions intended for a receiver, and excise transmissions not intended for that receiver, as part of the despreading procedure, even if received at much higher power levels than the intended transmissions. The resultant receiver eliminates the ability for an adversary to predict and override M2M transmissions; allows reception of ad-hoc transmissions in dense environments without scheduling, CSMA/CA protocols, or feedback paths enabling scheduling, and allows macrodiverse reception of transmissions at networks of connected receivers, thereby providing additional efficiency and security improvements by exploiting the route diversity of the network.

    Generation of signals with unpredictable transmission properties for wireless M2M networks
    10.
    发明授权
    Generation of signals with unpredictable transmission properties for wireless M2M networks 有权

    公开(公告)号：US10917768B2

    公开(公告)日：2021-02-09

    申请号：US16161539

    申请日：2018-10-16

    申请人： Brian G Agee

    发明人： Brian G Agee

    IPC分类号： H04B1/00 ,  H04W4/70 ,  H04B1/692 ,  H04J13/00 ,  H04B1/7103 ,  H04B1/7156 ,  H04B1/715

    摘要： Signals with unpredictable transmission properties enabling physically secure, unscheduled and interference-resistant machine-to-machine (M2M) communication are described. A physical dwell structure containing time slots and frequency channels is established, and a combination of unpredictable physical dwells, spread spectrum modulation with unpredictable spreading vectors, and unpredictable selection of intended receivers is described. These unpredictable transmission properties enable receivers to detect and extract transmissions intended for the receiver, and excise transmissions not intended for the receiver, even if they are received at much higher power levels than the intended transmissions. The system eliminates the ability for an adversary to predict and override M2M transmissions; allows reception of ad-hoc transmissions in dense environments without scheduling, carrier-sense multiple access with collision avoidance (CSMA/CA) protocols, or scheduling feedback paths; and allows macrodiverse reception of transmissions at networks of connected receivers, thereby providing additional efficiency and security improvements exploiting route diversity of the network.