Samsung Electronics Co., Ltd.

Jin Yuan

Jianzhong Zhang

Gary Xu

Yang Li

Gang Xu

Khurram Muhammad

Boon Loong Ng

Young-Han Nam

Yeqing Hu

Robert W Monroe

Eko Nugroho Onggosanusi

Rui Wang

Ioannis Tzanidis

Md Saifur Rahman

Ji-Yun Seol

Sridhar Rajagopal

Jianhua Mo

Shadi Abu-Surra

Vishnu Vardhan Ratnam

Yan Xin

Junmo Sung

Ahmad AlAmmouri

Chance Tarver

Matthew Tonnemacher

Xinguang Xu

Yu Liu

Robert Monroe

A method includes receiving, by a base station, a sounding reference signal (SRS) symbol from a user equipment (UE). The method also includes estimating, by the base station, an uplink (UL) channel from the UE to a full dimensional multiple-input multiple-output (FD-MIMO) base station base band based on the received SRS symbol. The method also includes receiving, by the base station from the UE, an estimate of a downlink (DL) channel from the FD-MIMO base station base band to the UE. The method also includes performing, by the base station, a joint calibration by applying one or more calibration algorithms using channel state information (CSI) of the UL channel and the DL channel.

System and method for user equipment assisted over-the-air calibration

A method includes determining one or more delay values and one or more phase shift values for generation of multiple desired frequency-dependent analog beams. The method also includes configuring one or more true-time delay (TTD) elements and one or more phase shifters of a transceiver based on the one or more delay values and the one or more phase shift values, the transceiver having one or more radio-frequency (RF) chains connected to multiple antennas via the one or more TTD elements and the one or more phase shifters. The method also includes operating the transceiver to generate the multiple desired frequency-dependent analog beams.

System and method for time-delay based hybrid beamforming

A method and an apparatus for self-interference cancellation in a communication device. The communication device includes an antenna configured to transmit a transmit signal and receive a receive signal through a duplexer in FDD communications, a first analog to digital converter (ADC) configured to convert the receive signal from analog to digital, a coupler configured to couple a sample of the transmit signal to a second ADC, which is configured to convert the sample of the transmit signal from analog to digital, and self-interference cancellation circuitry configured to process the digital sample of the transmit signal to generate a self-interference cancellation signal and apply the self-interference cancellation signal to the digital receive signal to cancel an amount of interference induced in the receive signal by the transmit signal. The SIC process provides additional isolation between TX signal and RX signal. The additional isolation could be utilized to relief the isolation requirement for the duplexer, reducing the cost and form factor of the duplexer.

Self-interference cancellation in frequency division duplexing system

A radio frequency (RF) unit and method of operation of the RF unit are disclosed herein. The RF unit comprises an antenna array, and the antenna array comprises a plurality of antenna elements. A first set of the plurality of antenna elements is configured to operate in a first mode and a second set of the plurality of antenna elements is configured to operate in a second mode. In the first mode, the first set of the plurality of antenna elements is configured to transmit and receive. In the second mode, the second set of the plurality of antenna elements is configured to only receive.

MIMO antenna array for cross division duplex

A base station configured to perform a method for self-interference cancelation (SIC) is provided. The method includes transmitting, by a transceiver configured to transmit an uplink channel and a downlink channel concurrently, one or more signals, the transceiver coupled to, or including, a first number of transmit antennas and a second number of receive antennas. The method also includes, for at least one receive antenna of the second number of receive antennas, applying a forward path model including a non-linear component corresponding to a transmit path in the transceiver, and applying an equalizer function to a first signal to be transmitted by at least one transmit antenna of the first number of transmit antennas determine a self-interference (SI) estimate; and subtracting, in SIC circuitry, the SI estimate from the signal received via at least one receive antenna of the second number of receive antennas to obtain an residual signal.

Hybrid GMP/equalizer digital self interference cancelation for MIMO transmitters

A communication device includes an antenna configured to receive a signal in a receive band and transmit a signal in a transmit band through a duplexer, analog transmitter-side radio frequency (RF) self-interference cancelation (SIC) circuitry configured to reduce power of the transmit signal in the receive band before input to the antenna, analog receiver-side RF SIC circuitry configured to reduce power of the receive signal in the transmit band before input to a first analog-to-digital converter (ADC) to convert the receive signal from analog to digital, a coupler configured to couple a small part of the transmit signal to a second ADC to convert the transmit signal from analog to digital, and digital SIC circuitry configured to process the digital sample to generate and apply an SIC signal to the digital receive signal to cancel interference induced in the receive signal by the transmit signal.

Hybrid self-interference cancelation in frequency division duplexing system

Methods and apparatuses in a wireless communication system. A method of operating a base station (BS) includes receiving a set of uplink signals; estimating, based on a subset of the set of uplink signals, uplink channels; estimating a timing offset (TO) and a frequency offset (FO) for a subset of the estimated uplink channels; compensating, based on the estimated TO and FO, the subset of the estimated uplink channels to generate TO and FO compensated uplink channel estimates; and generating channel prediction information based on the compensated subset of the estimated uplink channels.

Uplink timing and frequency offset estimation and compensation for CSI estimation and tracking

A method for a user equipment (UE) is provided. The method comprises receiving, from a base station (BS), information via a dynamic signaling comprising at least one of a medium access control channel element (MAC CE) or downlink control information (DCI) that includes information for a set of channel state information-reference signal (CSI-RS); identifying CSI-RS resources each of which comprises a set of antenna ports based on the information; and measuring CSI using an aggregation of the CSI-RS resources, wherein an energy per resource element (EPRE) ratio between a CSI-RS and a physical downlink shared channel (PDSCH) is configured in the information to each of the CSI-RS resources comprising the aggregated CSI-RS resources.

Distributed FD-MIMO: cellular evolution for 5G and beyond

Reciprocity base frequency division duplex (FDD) multiple-input-multiple-output (MIMO) downlink (DL) channel Channel-State Information (CSI) acquisition is provided. A base station (BS) includes a transceiver configured to measure uplink (UL) sounding reference signals (SRSs) at a UL carrier frequency, using two polarization components of an antenna array of the BS, and a processor configured to determine a quantity of propagation paths between the BS and a user equipment (UE), for each of the determined propagation paths, extract propagation parameters from the UL SRS measurements, for each of the determined propagation paths, predict a downlink (DL) channel based on the extracted propagation parameters and a DL carrier frequency, and generate a precoding channel matrix for the UE by summing the predicted DL channels for each of the determined propagation paths and for each of the two polarization components of the antenna array of the BS.

Reciprocity based FDD FD-MIMO DL channel CSI acquisition

Methods and Apparatuses for a transceiver calibration and antenna array operation in a multi-input multi-output (MIMO) system. One of the methods for operation of one or more of the apparatuses comprises sending a calibration signal and a pre-designed training sequence, via a coupling network, receiving a calibration signal and a pre-designed training sequence that is sent by the transceiver array in a time slotted pattern via a coupling network, generating an Rx calibration measurement (R) based on one or more uplink signals received via antenna array and the coupling network, generating a Tx calibration measurement (T) based on receipt of the calibration signal from each of antennas via the coupling network; and performing a joint Tx/Rx (TRx) calibration based on HR, R, and T, where H is a channel response in air interface, R is a channel response of receivers in transceiver array.

Methods and apparatus for calibration and array operation in advanced MIMO system

A method for operating a large scale antenna array in a wireless communication system includes receiving one or more signals. The one or more signals include information for beamforming to a plurality of user equipments (UEs) using a full-dimensional multiple-input multiple-output (FD-MIMO) beamforming scheme. The FD-MIMO beamforming scheme includes same time resources and same frequency resources that are co-scheduled to the plurality of UEs. The method further includes identifying a time delay of the one or more signals associated with one or more antenna arrays that are distributed in the large scale antenna array and performing a multi-user (MU) joint beamforming on the one or more signals to one or more UEs.

2D active antenna array operation for wireless communication systems

A base station (BS) capable of communication with a number of transmission points includes a processor configured to control a beamforming transmission or reception and an integrated antenna array system. The integrated antenna array system includes a baseband signal processing unit configured to perform baseband functions and disposed between the two sections. The integrated antenna array system also includes a plurality of physical antenna elements disposed in groups. Each of the groups includes an equal number of the plurality of physical antenna elements. The plurality of physical antenna elements are disposed symmetrically around the baseband signal processing unit.

Growing community of inventors

Richardson, TX, United States of America

Jin Yuan