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    EQUALIZATION OF RECEIVER
    21.
    发明申请
    EQUALIZATION OF RECEIVER 审中-公开

    公开(公告)号：US20180048340A1

    公开(公告)日：2018-02-15

    申请号：US15410427

    申请日：2017-01-19

    Applicant: Matthew C. Guyton ,  Xiao Wang

    Inventor： Matthew C. Guyton ,  Xiao Wang

    IPC: H04B1/10 ,  H04L27/01 ,  H04B7/005 ,  H04L25/03 ,  H04L25/02

    CPC classification number: H04B1/1036 ,  H04B1/0028 ,  H04B1/1027 ,  H04B1/1638 ,  H04B7/005 ,  H04L1/00 ,  H04L25/022 ,  H04L25/0222 ,  H04L25/03019 ,  H04L27/01 ,  H04L27/22 ,  H04L27/38

    Abstract: Methods and systems for equalization of a first receiver. A method may include receiving an input signal at the first receiver. The method may also include receiving the input signal at a second receiver. The method may further include determining, from an output response of the second receiver, an estimate of an out-of-channel interferer present in the input signal. The method may also include determining an estimate, of an undesired in-channel response of the first receiver to the out-of-channel interferer present in the input signal. The method may include applying the estimate, of the undesired in-channel response of the first receiver to the out-of-channel interferer present in the input signal, to an output signal of the first receiver to substantially cancel an instance of an undesired in-channel response of the first receiver to the out-of-channel interferer.

    SYSTEM AND METHODS FOR DETERMINING CHANNEL CHARACTERISTICS
    25.
    发明申请
    SYSTEM AND METHODS FOR DETERMINING CHANNEL CHARACTERISTICS 审中-公开

    公开(公告)号：US20170339038A1

    公开(公告)日：2017-11-23

    申请号：US15161975

    申请日：2016-05-23

    Applicant: The Boeing Company

    Inventor： Matthew M. EVERETT ,  Tuan Q. HA ,  Christopher W. REEVES

    IPC: H04L12/26 ,  H04L1/00

    CPC classification number: H04L43/0847 ,  H04L1/0071 ,  H04L1/0073 ,  H04L25/0222 ,  H04L25/0224 ,  H04L43/0829

    Abstract: A system for determining communication channel characteristics includes a transmitter comprising a bit sequence generator and a frame processing and modulator unit, where the frame processing and modulator unit is configured to generate a transmission frame comprising an embedded bit sequence generated by the bit sequence generator and at least one embedded side channel field, the transmitter further configured to transmit the transmission frame over a communications channel, a receiver in communication with the transmitter over the communications channel and configured to receive the transmission frame, and a data processor, in communication with the receiver through a data processor interface, configured to receive the transmission frame from the receiver, the processor further configured to process the transmission frame to detect and analyze distortions in a waveform corresponding to the transmission frame generated during the transmission over the communications channel based on the embedded bit sequence and the at least one embedded side channel field.

    TOMLINSON-HARASHIMA PRECODING IN AN OTFS COMMUNICATION SYSTEM
    28.
    发明申请
    TOMLINSON-HARASHIMA PRECODING IN AN OTFS COMMUNICATION SYSTEM 审中-公开

    公开(公告)号：US20170288710A1

    公开(公告)日：2017-10-05

    申请号：US15478174

    申请日：2017-04-03

    Applicant: Cohere Technologies, Inc.

    Inventor： Jim Delfeld ,  Shlomo Selim Rakib

    IPC: H04B1/04 ,  H04B7/0456 ,  H04L27/26 ,  H04L25/02 ,  H04L5/00

    CPC classification number: H04B7/0456 ,  H04B7/0413 ,  H04L5/0048 ,  H04L25/0222 ,  H04L25/4975 ,  H04L27/265

    Abstract: A method for signal transmission using precoded symbol information involves estimating a two-dimensional model of a communication channel in a delay-Doppler domain. A perturbation vector is determined in a delay-time domain wherein the delay-time domain is related to the delay-Doppler domain by an FFT operation. User symbols are modified based upon the perturbation vector so as to produce perturbed user symbols. A set of Tomlinson-Harashima precoders corresponding to a set of fixed times in the delay-time domain may then be determined using a delay-time model of the communication channel. Precoded user symbols are generated by applying the Tomlinson-Harashima precoders to the perturbed user symbols. A modulated signal is then generated based upon the precoded user symbols and provided for transmission over the communication channel.

    METHOD FOR ESTIMATING A RADIOELECTRIC PROPAGATION CHANNEL
    30.
    发明申请
    METHOD FOR ESTIMATING A RADIOELECTRIC PROPAGATION CHANNEL 有权

    公开(公告)号：US20170141858A1

    公开(公告)日：2017-05-18

    申请号：US15319879

    申请日：2015-06-17

    Applicant: AIRBUS DS SAS

    Inventor： Philippe MEGE

    IPC: H04B17/309 ,  H04L25/02 ,  H04L25/03

    CPC classification number: H04B17/309 ,  H04L25/021 ,  H04L25/0222 ,  H04L25/03171

    Abstract: A method estimates a channel for radioelectric propagation between a transmitter and a receiver. The transmitter transmits a signal including frames that each use N1 frequency subcarriers, over each of which N1 symbols are transmitted, wherein, among the set of symbols, certain symbols, referred to as pilot symbols, are known to the receiver. The method implemented in the receiver includes; determining an overall intermediate covariance matrix M2 of the channel that embodies a time profile of the channel, which profile is symmetrical and centered on the time synchronization position, and a frequency profile of the channel, which profile is symmetrical and centered on the frequency synchronization position; calculating a vector for an intermediate channel C on the basis of the predetermined overall intermediate covariance matrix M2; and estimating the channel on the basis of the calculated vector for the intermediate channel C′.

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