Gear shifting in a Skywave system

    公开(公告)号:US11916706B2

    公开(公告)日:2024-02-27

    申请号:US17651981

    申请日:2022-02-22

    摘要: A gear shifting technique has been developed in which modulation and equalization are shifted to achieve optional performance. In one form, two or more equalizers, each associated with a demodulator and message decoder, determine if the modulation being used can be increased in complexity in order to increase the channel throughput or determine if the modulation method should be reduced in complexity in order to improve the receiver error performance. The quality metrics can based on which equalizer-demodulator-decoder is set to first detect a valid message. Other factors can be considered with this technique such as a packet-error ratio and a signal-to-noise ratio. In a financial trading system, message erasures can be favored over errored messages by limiting the number of bit or symbol corrections permitted per message to less than the maximum possible for the selected decoding schemes.

    Techniques for signaling a source of dominant noise at a user equipment

    公开(公告)号:US11799710B2

    公开(公告)日:2023-10-24

    申请号:US17117264

    申请日:2020-12-10

    摘要: This disclosure provides methods, devices and systems for pre-compensation of downlink communication based on a transmission of a request for the pre-compensation from a user equipment (UE). For example, the UE may determine an impairment at the UE that has a greater severity (a greater impact on downlink communication) or is associated with a greater amount of resources for processing relative to a remainder of a set of impairments that is experienced at the UE and the UE may transmit a request for pre-compensation of the impairment by a base station. The base station may transmit feedback to the UE indicating a confirmation of pre-compensation for the impairment by the base station or to deferment of compensation for the impairment back to the UE. If the base station acknowledges pre-compensation for the impairment, the base station may pre-compensate a downlink transmission to the UE for the impairment.

    Improving PAM Transmission in DL MU-MIMO by Choosing Signaling Dimensions

    公开(公告)号:US20190149391A1

    公开(公告)日:2019-05-16

    申请号:US16098022

    申请日:2017-05-11

    摘要: One dimension (real or imaginary) is selected for each of a first plurality of devices that receives one-dimensional modulated complex signals from an access point (AP). The AP uses the selected dimension to generate a modulated complex signal for transmission to each such device, where the signal received by such devices is substantially free of inter-user interference on the dimension selected for the corresponding device. The AP then transmits the complex signal to the devices. As a result, the AP puts the modulated symbols received by of the first plurality of devices are received on either a real part or an imaginary part, but not both, and thus reduces the energy consumption associated with the transmission. Each of the first plurality of wireless devices considers either the real part or the imaginary part of the received signals.

    Methods of operating and implementing wireless communications systems

    公开(公告)号:US10064074B1

    公开(公告)日:2018-08-28

    申请号:US15485101

    申请日:2017-04-11

    摘要: Computerized wireless transmitter/receiver system that automatically uses combinations of various methods, including transmitting data symbols by weighing or modulating a family of time shifted and frequency shifted waveforms bursts, pilot symbol methods, error detection methods, MIMO methods, and other methods, to automatically determine the structure of a data channel, and automatically compensate for signal distortions caused by various structural aspects of the data channel, as well as changes in channel structure. Often the data channel is a two or three dimensional space in which various wireless transmitters, receivers and signal reflectors are moving. The invention's modulation methods detect locations and speeds of various reflectors and other channel impairments. Error detection schemes, variation of modulation methods, and MIMO techniques further detect and compensate for impairments. The invention can automatically optimize its operational parameters, and produce a deterministic non-fading signal in environments in which other methods would likely degrade.

    DEVICE AND METHOD FOR TRANSMITTING DATA
    9.
    发明申请

    公开(公告)号:US20180019907A1

    公开(公告)日:2018-01-18

    申请号:US15678544

    申请日:2017-08-16

    发明人: Berthold LANKL

    摘要: A method for transmitting data, wherein along a transmission path: (i) a modulated carrier signal is generated based on the data to be transmitted, the carrier signal having a carrier frequency within a given transmission channel, which is comprised of a number of frequencies, and (ii) the modulated carrier signal is amplified to a transmission signal, wherein along a compensation path: (i) the modulated carrier signal is filtered, whereby the frequency components within the transmission channel are removed, and at least one of a phase, an amplitude, and/or a delay of the filtered signal is modified thereby generating a compensation signal, and wherein the compensation signal is subtracted from the transmission signal thereby generating a compensated transmission signal, and wherein the compensated transmission signal is transmitted. Also a respective data transmission device is disclosed.

    Method And System For I/Q Mismatch Calibration And Compensation For Wideband Communication Receivers

    公开(公告)号:US20170373912A1

    公开(公告)日:2017-12-28

    申请号:US15682446

    申请日:2017-08-21

    申请人: Maxlinear, Inc.

    摘要: Methods and systems for I/Q mismatch calibration and compensation for wideband communication receivers may comprise receiving a plurality of radio frequency (RF) channels, downconverting the received plurality of received RF channels to baseband frequencies, determining and removing average in-phase (I) and quadrature (Q) gain and phase mismatch of the downconverted channels, determining a phase and amplitude tilt of the downconverted channels with removed average I and Q gain and phase mismatch, and compensating for said phase and amplitude tilt I and Q gain and phase mismatch of the downconverted channels. The determined phase tilt may be compensated utilizing a phase tilt correction filter, which may comprise one or more all-pass filters. The average I and Q gain and phase mismatch may be determined utilizing a blind source separation (BSS) estimation algorithm.