Fraunhofer-gesellschaft Zur Foerderung Der Angewandten Forschung E.v.

Marcus Großmann

Markus Landmann

Venkatesh Ramireddy

Sutharshun Varatharaajan

Thomas Haustein

Leszek Raschkowski

Ramez Askar

Paul Leather

Lars Thiele

Martin Kurras

Niels Hadaschik

Ernst Eberlein

Norbert Franke

Mohammad Alawieh

Birendra Ghimire

Junyoung Nam

A communication device for providing a channel state information, CSI, feedback in a wireless communication system includes a transceiver to receive, from a transmitter a radio signal via a time-variant, frequency-selective MIMO channel, the radio signal including downlink reference signals according to a reference signal configuration including a number of antenna ports, and downlink signals including the reference signal configuration; and a processor. The processor estimates an explicit CSI in the frequency domain using measurements on the downlink reference signals on the radio channel, selects a Doppler-delay precoder matrix (W) for a composite Doppler-delay-beam three-stage precoder, calculates either one or more of a channel quality indicator, CQI, and/or a precoder matrix indicator, PMI, and/or a rank indicator, RI, and reports to the transmitter the CSI feedback including either one or more of the CQI, and/or the PMI and/or the RI.

Doppler-delay codebook-based precoding and CSI reporting for wireless communications systems

A communication device providing CSI feedback in a wireless communication system includes a transceiver to receive downlink reference signals and downlink signals including a reference signal configuration. A processor estimates an explicit CSI in the frequency domain. The processor selects a Doppler-delay-beam precoder matrix for a composite Doppler-delay-beam three-stage precoder, which is based on one or more codebooks including

Doppler codebook-based precoding and CSI reporting for wireless communications systems

An apparatus for a wireless communication system is to transmit a reference signal on a common set of resource elements, REs, the common set of REs used by one or more further apparatuses in the wireless communication system to transmit the reference signal so that the reference signals of the apparatus and of the one or more further apparatuses use the same REs. The reference signal is transmit using OFDM symbols and the same sequence having a zero auto correlation property is applied to each OFDM symbol. A phase correction is applied to an OFDM symbol before transmission, wherein a correction factor of the phase correction depends on a comb factor and a comb offset of the OFDM symbol and is independent of the resource element.

Ambiguity/aliasing cancellation or reduction for staggered reference signals

An apparatus configured for wirelessly communicating in a wireless communications network includes a wireless interface configured for wireless communication and a controller configured for controlling a beam pattern of the wireless interface and at least one communication parameter of the wireless interface. The apparatus is configured for receiving a locking signal indicating a request for locking at least a part of the beam pattern and the at least one communication parameter. The controller is configured for locking at least the part of the beam and the at least one communication parameter responsive to the locking signal.

Apparatus, measurement system and measurement setup and methods for testing an apparatus

A user equipment, UE, for communicating with a base station, BS, in a wireless communication system is described. The UE comprises one or more antenna arrays, each antenna array having a plurality of antenna elements. The UE signals to a BS, dependent on a property of the one or more antenna arrays, whether the UE supports full beam correspondence, partial beam correspondence or no beam correspondence.

Beam correspondence indication and bitmap for beam reporting for wireless communications

A receiver processes a radio signal received via a radio channel from a transmitter employing a plurality of antenna ports, determines complex precoder coefficients and delays of one or more space-delay precoders for one or more transmission layers and antenna ports at the transmitter so as to achieve a predefined property for a communication over the radio channel, and feeds back, explicitly or implicitly, delays and the complex precoder. The space-delay precoder has a dual-stage structure having a spatial codebook matrix including spatial beamforming vectors, a frequency-domain codebook matrix, and a combining element per layer for complex scaling or combining one or more of the vectors selected from the spatial and/or frequency-domain codebook matrices. The frequency-domain codebook matrix is defined by a sub-matrix of a DFT matrix, which the sub-matrix of the DFT matrix is associated with a range of delay values.

Receiver, transmitter, system and method employing space-delay precoding

The application relates to a communication device [e.g., UE] for communicating with one or more other communication devices using multiple-input-multiple-output, MIMO, communication, wherein the communication device is configured to:

Communication devices, communication coordinating devices, and communication methods

Doppler-delay codebook-based precoding and CSI reporting wireless communications systems

A receiver includes an antenna for a wireless communication with a transmitter and a signal processor to process a radio signal received via a radio channel. The receiver constructs a codebook including sets of beamforming weights for a plurality of directions. The beamforming weights are based on a first antenna array response matrix of a transmitter antenna array. The transmitter selects beamforming weights from the codebook to form a transmit/receive beam pointing in a selected direction. The receiver calculates one or more characteristic matrices based on a model of the transmitter antenna array, and constructs the codebook using a second antenna array response matrix and the one or more calculated characteristic matrices.

Antenna array codebook with beamforming coefficients adapted to an arbitrary antenna response of the antenna array

A base station is configured to control a wireless communication network cell of a wireless communication network and is configured to use a coarse position information related to a coarse position of a user equipment to determine a direction towards the user equipment. The base station is configured to transmit a positioning signal to the user equipment and to direct the transmission of the positioning signal towards the user equipment. The positioning signal is adapted to allow for a determining of a fine position information relating to the user equipment.

Base station, wireless communications network and methods for operating the same

A receiver receives and processes a radio signal received via a frequency selective radio channel from a transmitter employing a plurality of transmit antennas. The receiver determines, based on the received signal, complex precoder coefficients and delays of respective space-delay precoders for each layer and transmit antenna at the transmitter so as to achieve a predefined property for a communication over the radio channel, each space-delay precoder modeling or defining for the associated transmit antenna a plurality of cyclic filters delaying and weighting a signal to be transmitted with the corresponding precoder delays and complex precoder coefficients, respectively, and feeds back to the transmitter the determined delays explicitly or implicitly and the determined complex precoder coefficients explicitly or implicitly, the transmitter precoding the signals to be transmitted to the receiver using the fed back delays and complex precoder coefficients.

A transmitter includes an antenna array having a plurality of antennas for a wireless communication with one or more receivers, and a precoder connected to the antenna array. The precoder applies a set of beamforming weights to the antenna array. The set of beamforming weights is selected from a codebook to transmit/receive beams or nulls pointing in selected directions. The codebook includes sets of beamforming weights for a plurality of directions. The beamforming weights are based on a first antenna array response matrix defined by a second antenna array response matrix and one or more transformation matrices. The first antenna array response matrix contains first array response vectors of the antenna array, the second antenna array response matrix contains second array response vectors determined using a model of the antenna array. The transformation matrices describe one or more characteristics of the antenna array.

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Erlangen, Germany

Marcus Großmann