Abstract: A computer-implemented method performed by a first electronic device for reducing a feedback overhead of beamforming in a wireless communication system, includes: transmitting a first data to a second electronic device; transmitting a data packet to the second electronic device; receiving a second data from the second electronic device; extracting a compressed steering matrix from the second data; obtain uncompressed steering matrix by using a decoder part of an autoencoder, based on the extracted compressed steering matrix; and transmitting, to the second electronic device, a third data via a radio signal beamformed based on the obtained uncompressed steering matrix.

Abstract: A distortion apparatus for a power amplifier comprises: pre-distortion circuitry that comprises a memory polynomial look-up-table (LUT) circuit; and post-distortion circuitry that updates the pre-distortion circuitry based on an output of the power amplifier. The pre-distortion circuitry comprises a plurality of LUTs. Each LUT corresponds to a different memory depth of a memory polynomial of a Volterra series. Each LUT indexed by an instantaneous power of an input sample delayed by an amount corresponds to a respective memory depth of each LUT. An output of the memory polynomial LUT circuit corresponds to a summation of an output of each LUT multiplied by the input sample delayed by the amount corresponding to the respective memory depth of each LUT, and an output of the pre-distortion circuitry is provided to the power amplifier.

Abstract: A second apparatus configured to communicate with a first apparatus in a wireless local area network (WLAN), including: a transceiver; and at least one processor configured to: receive, using the transceiver, a null data packet (NDP) from the first apparatus, generate a channel estimate based on the NDP, decompose the channel estimate to obtain a feedback matrix, based on the feedback matrix, obtain beamforming information to be used by the first apparatus to perform beamforming, transmit, using the transceiver, the beamforming information to the first apparatus, and receive, using the transceiver, a data transmission which is beamformed by the first apparatus based on the beamforming information, wherein the beamforming information includes at least one from among: a pair of angle indices which indicate a pair of angle vectors to be used by the first apparatus to beamform the data transmission, and a steering matrix index which indicates a steering matrix to be used by the first apparatus to beamform the dat

Abstract: The present invention discloses an ultra-wideband cross-polarized antenna and ultra-wideband cross-polarized array antenna, including a substrate, and a first polarized antenna and a second polarized antenna provided in the substrate and orthogonal to each other. The ultra-wideband cross-polarized antenna has a simple structure, is easy to produce and is able to solve challenging bandwidth issues, cross-polarized port isolation issues, and beam scanning range issues in 5G millimeter wave array antennas.

Abstract: A communication device, including a receiver configured to receive a signal comprising a plurality of training symbols and a data symbol; and at least one processor configured to: select, from among the plurality of training symbols, a first training symbol and a second training symbol based on a first parameter and a second parameter; obtain a first symbol difference corresponding to the first training symbol, and a second symbol difference corresponding to the second training symbol; estimate a carrier frequency offset based on the first symbol difference and the second symbol difference; obtain a compensated data symbol corresponding to the data symbol based on the estimated carrier frequency offset; and demodulate and decode the compensated data symbol to obtain decoded data.

Abstract: A communication device, including a receiver configured to receive a signal from a transmitter, the signal including a plurality of data symbols; and at least one processor configured to: obtain a channel estimate and an estimated carrier frequency offset based on a result of an interference detection indicating whether interference is detected in the plurality of data symbols, obtain a data symbol of the plurality of data symbols, obtain a compensated data symbol corresponding to the data symbol based on the estimated carrier frequency offset, obtain an equalized compensated data symbol by performing channel equalization on the compensated data symbol based on the channel estimate, and demodulate and decode the equalized compensated data symbol to obtain decoded data.

Abstract: The present invention discloses an ultra-wideband cross-polarized antenna and ultra-wideband cross-polarized array antenna, including a substrate, and a first polarized antenna and a second polarized antenna provided in the substrate and orthogonal to each other. The ultra-wideband cross-polarized antenna has a simple structure, is easy to produce and is able to solve challenging bandwidth issues, cross-polarized port isolation issues, and beam scanning range issues in 5G millimeter wave array antennas.

Abstract: The present disclosure describes systems and methods for time-of-arrival (TOA) estimation techniques. Some embodiments of the disclosure provide for estimating radio propagation path parameters based on a training signal received over a set of active frequencies. The radio propagation path parameters (e.g., fading coefficients for each path) are used to reconstruct a channel frequency response on null frequencies (e.g., frequencies that did not include or carry the received training signal). A time-of-arrival parameter can then be estimated based on the estimated channel frequency response and the reconstructed channel frequency response (e.g., the channel frequency response estimated using both active frequencies and null frequencies).

Abstract: One or more aspects of the techniques and models described herein provide for bidirectional recurrent neural network (BiRNN)-based digital pre-distortion techniques for radio frequency (RF) power amplifiers (PAs). As an example, a digital pre-distorter (DPD) system may implement residual learning and long short-term memory (LSTM) projection layer features to reduce computational complexity and memory requirements. Implementing the described unconventional techniques of applying residual learning in RNN (e.g., in BiLSTM), using LSTM projection to develop a DPD structure, or both, may provide several advantages over preexisting techniques. For instance, the complexity in training and pre-distortion may be reduced and significantly less memory may be required to store the DPD neural network coefficients (e.g., while achieving similar or better linearization performance compared to other LSTM models). Further, faster training convergence speed may be achieved (e.g., compared to other LSTM models).

Abstract: A dual-band cross-polarized antenna includes first and second metal layers defining respective first and second driven patches configured to radiate at different frequencies, first and second feed pins connecting a first feed line to the first driven patch at respective first and second feed points thereof associated with orthogonal polarizations, and third and fourth feed pins connecting a second feed line to the second driven patch at first and second feed points thereof associated with orthogonal polarizations. The third feed pin extends through a first hole in the first driven patch to capacitively couple the third feed pin to the first driven patch. The fourth feed pin extends through a second hole in the first driven patch to capacitively couple the fourth feed pin to the first driven patch. Two or more antenna elements are arranged as a phased array antenna and packaged as an antenna module.

Abstract: A method for detecting a modification, due to an interferer, of a wireless channel between a transmitting device and a receiving device. First and second samples of channel frequency response (CFR) of the wireless channel are measured within a time interval less than or equal to a pre-established static time interval throughout which the wireless channel is expected to exhibit a static characteristic in an environment without any interferer. An interferer is detected to have modified the wireless channel when a similarity condition reflecting a degree of similarity between the first and second CFR samples is not satisfied.

Abstract: The present disclosure describes systems and methods for time-of-arrival (TOA) estimation techniques. Some embodiments of the disclosure provide for estimating radio propagation path parameters based on a training signal received over a set of active frequencies. The radio propagation path parameters (e.g., fading coefficients for each path) are used to reconstruct a channel frequency response on null frequencies (e.g., frequencies that did not include or carry the received training signal). A time-of-arrival parameter can then be estimated based on the estimated channel frequency response and the reconstructed channel frequency response (e.g., the channel frequency response estimated using both active frequencies and null frequencies).

Abstract: A 5G broadband antenna is disclosed herein. The 5G broadband antenna comprises a first antenna element and a second antenna element. Each of the first antenna element and the second antenna element has a main branch with a slot therein. The antenna apparatus covers a first frequency band of 617-960 MegaHertz, a second frequency band of 1.4-1.6 GigaHertz (GHZ), a third frequency band of 1.71-2.7 GHz, a fourth frequency band of 3.3 to 4.2 GHz, and a fifth frequency band of 4.3 to 6.0 GHz.

Abstract: A dual-band cross-polarized antenna includes first and second metal layers defining respective first and second driven patches configured to radiate at different frequencies, first and second feed pins connecting a first feed line to the first driven patch at respective first and second feed points thereof associated with orthogonal polarizations, and third and fourth feed pins connecting a second feed line to the second driven patch at first and second feed points thereof associated with orthogonal polarizations. The third feed pin extends through a first hole in the first driven patch to capacitively couple the third feed pin to the first driven patch. The fourth feed pin extends through a second hole in the first driven patch to capacitively couple the fourth feed pin to the first driven patch. Two or more antenna elements are arranged as a phased array antenna and packaged as an antenna module.

Abstract: A 5G broadband antenna is disclosed herein. The 5G broadband antenna comprises a first antenna element and a second antenna element. Each of the first antenna element and the second antenna element has a middle section with a slot therein. The antenna apparatus covers a first frequency band of 617-960 MegaHertz, a second frequency band of 1.4-1.6 GigaHertz (GHZ), a third frequency band of 1.71-2.7 GHz, and a fourth frequency band of 3.3 to 4.2 GHz.