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公开(公告)号:US11916706B2
公开(公告)日:2024-02-27
申请号:US17651981
申请日:2022-02-22
申请人: Skywave Networks LLC
IPC分类号: H04L27/00 , H04B17/336 , G06Q40/02 , H04L27/01 , H04L43/0823 , H04L43/0852 , H04L27/36
CPC分类号: H04L27/0008 , G06Q40/02 , H04B17/336 , H04L27/01 , H04L43/0823 , H04L43/0852 , H04L27/366
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.
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公开(公告)号:US11799710B2
公开(公告)日:2023-10-24
申请号:US17117264
申请日:2020-12-10
发明人: Yehonatan Dallal , Ran Berliner , Idan Michael HOrn , Shay Landis
IPC分类号: H04L27/36 , H04B17/336 , H04B7/01 , H04W8/24 , H04W24/10
CPC分类号: H04L27/366 , H04B7/01 , H04B17/336 , H04L27/364 , H04W8/245 , H04W24/10
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.
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公开(公告)号:US20190182847A1
公开(公告)日:2019-06-13
申请号:US16263793
申请日:2019-01-31
发明人: Yingyang LI , Chengjun SUN
IPC分类号: H04W72/08 , H04B17/24 , H04L5/00 , H04L1/00 , H04W72/12 , H04L27/36 , H04W72/04 , H04B17/309
CPC分类号: H04W72/085 , H04B17/24 , H04B17/309 , H04L1/0003 , H04L1/0009 , H04L1/0016 , H04L5/0046 , H04L5/0057 , H04L5/006 , H04L27/362 , H04L27/366 , H04W72/042 , H04W72/1231
摘要: Disclosed is a downlink transmission method that includes UE receiving configuration information sent form base station and accordingly adjusting CQI table and MCS table; UE measuring and reporting downlink channel quality indicator information to the base station; with the UE reporting the CQI information according to a backward compatible CQI table or a CQI table which supports 256 QAM modulation; and the UE receiving downlink scheduling information sent from the base station, receiving accordingly downlink data sent from the base station, with the UE processing the MCS information according to a backward compatible MCS table or a MCS table which supports 256 QAM modulation.
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公开(公告)号:US20190149391A1
公开(公告)日:2019-05-16
申请号:US16098022
申请日:2017-05-11
发明人: Dzevdan Kapetanovic
IPC分类号: H04L27/36 , H04B7/0452 , H04B7/0456 , H04L27/38
CPC分类号: H04L27/366 , H04B7/0452 , H04B7/0456 , H04L27/38 , Y02D70/20 , Y02D70/21 , Y02D70/444
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.
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公开(公告)号:US10064074B1
公开(公告)日:2018-08-28
申请号:US15485101
申请日:2017-04-11
发明人: Shlomo Selim Rakib , Ronny Hadani
CPC分类号: H04W24/02 , H04B1/692 , H04B7/0626 , H04B7/10 , H04L5/0007 , H04L5/0048 , H04L25/0212 , H04L25/0226 , H04L27/366
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.
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公开(公告)号:US20180123857A1
公开(公告)日:2018-05-03
申请号:US15796834
申请日:2017-10-29
申请人: Allen LeRoy Limberg
发明人: Allen LeRoy Limberg
CPC分类号: H04L27/389 , H04L1/0041 , H04L1/0042 , H04L1/0045 , H04L1/0071 , H04L25/03159 , H04L27/2605 , H04L27/2617 , H04L27/2647 , H04L27/3411 , H04L27/366
摘要: In independent-sideband (ISB) coded orthogonal frequency-division multiplexing (COFDM) modulation, data is transmitted twice in each COFDM symbol interval. The data is mapped both to OFDM carriers located in the lower sideband of the ISB COFDM modulation signal and to OFDM carriers located in its upper sideband. Preferably, the ordering of OFDM carriers modulated by given coded data is the same in both the lower and upper sidebands of the COFDM modulation signal. Preferably, bits of the labels in the map of QAM symbol constellations in the each sideband more likely to experience error correspond to bits of the labels in the map of QAM symbol constellations in the other sideband less likely to experience error.
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公开(公告)号:US20180069742A1
公开(公告)日:2018-03-08
申请号:US15647275
申请日:2017-07-12
申请人: MEDIATEK INC.
发明人: Chien-Cheng Lin , Ming-Da Tsai
CPC分类号: H04L27/366 , H03C3/08 , H03D7/166 , H03F1/14 , H03F1/3205 , H03F1/3211 , H03F1/3264 , H03F3/21 , H03F3/45179 , H03F3/45183 , H03F2200/21 , H03F2200/213 , H03F2200/228 , H03F2200/249 , H03F2200/471 , H03F2200/489 , H03F2200/492 , H03F2200/534 , H03F2200/75 , H03F2201/3218 , H03F2203/45036 , H03F2203/45101 , H03F2203/45112 , H03F2203/45134 , H03F2203/45136 , H03F2203/45138 , H03F2203/45146 , H03F2203/45151 , H03F2203/45156 , H03F2203/45168 , H03F2203/45172 , H03F2203/45208 , H03F2203/45256 , H03F2203/45292 , H03F2203/45312 , H03F2203/45356 , H03F2203/45374 , H03F2203/45386 , H03F2203/45402 , H03F2203/45436 , H03F2203/45544 , H03F2203/45596 , H03F2203/45622 , H04B2001/0408
摘要: A compensation circuit of a power amplifier includes a varactor, a voltage sensor and a control circuit. The varactor is coupled to an input terminal of the power amplifier. The voltage sensor is arranged for detecting an amplitude of an input signal of the power amplifier to generate a detecting result. The control circuit is coupled to the varactor and the voltage sensor, and is arranged for controlling a bias voltage of the varactor to adjust a capacitance of the varactor according to the detecting result.
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公开(公告)号:US20180041372A9
公开(公告)日:2018-02-08
申请号:US15037205
申请日:2013-12-13
发明人: Thomas Frederick
CPC分类号: H04L27/367 , G06K7/10009 , G06K7/10297 , G06K19/0723 , H03C1/00 , H03C5/00 , H03F1/3241 , H04B1/59 , H04B5/00 , H04B5/0062 , H04B2001/0425 , H04L27/04 , H04L27/06 , H04L27/18 , H04L27/366 , H04L43/028 , H04W4/35 , H04W4/80
摘要: A waveform synthesis technique for radio frequency identification (RFID) transmitters and an RFID system making us of the technique are disclosed. The RFID transmitter in example embodiments synthesizes a continuous transmitter waveform from a symbol alphabet without Nyquist or interpolation filters. High spectral occupancy waveforms are achieved which include the ability to do both linear and nonlinear predistortion with no increase in computational load once the signal set has been adapted to compensate for linear and nonlinear distortion in the transmitter analog circuitry. A polarity generator can be used to impart the required polarity to each waveform. The RFID transmitter can be employed in RFID readers to reduce the computational requirements of the digital signal processor (DSP).
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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
CPC分类号: H04L27/366 , H03F1/32 , H03F1/3223 , H03F3/24 , H03F3/245 , H04B1/0475 , H04B2001/0408 , H04L27/04 , H04L27/12 , H04L27/2003 , H04L27/368
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.
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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.
发明人: Yongtao Wang , Curtis Ling , Timothy Gallagher
IPC分类号: H04L27/38 , H04L27/233 , H04L27/36
CPC分类号: H04L27/3863 , H04L27/2334 , H04L27/2338 , H04L27/2636 , H04L27/361 , H04L27/366
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.
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