Abstract: A system for providing distributed communication with respect to a user equipment is provided. The system includes multiple communication units for distributing the communication with respect to the user equipment, a communication management unit connected to at least a pan of the multiple communication units in a connection line for managing the distributed communication, a connection unit including loss-inserting properties for connecting the multiple communication units to the connection line, an amplifying unit for being arranged with respect to the connection units, and a scheduling unit. The scheduling unit is configured to determine power loss with respect to the units on the basis of the corresponding loss-inserting properties and/or to schedule at least one of the multiple communication units and/or the at least one amplifying unit m order to compensate for power loss with respect to the at least one connection unit.

Abstract: An orthogonal frequency-division multiplexing (OFDM) based radar signal comprising Q sub-carriers adapted to push an IQ-imbalance component out of a subset of L contiguous range bins of range profiles derived out of the received radar signal and wherein L is at most Q/2, is disclosed.

Abstract: In a radar system, a cancellation circuit is described for compensating for the effects of spillover between each transmitter and a receiver. The cancellation circuit is configured for applying cancellation signals to the receiver which are generated in a cancellation filter utilizing a primary impulse response characteristic corresponding to the spillover, a signal to be transmitted from each transmitter in the radar system, and a range profile output from the receiver. The cancellation circuit may also include a secondary impulse response characteristic module and a dithering module to improve the sensitivity of the receiver.

Abstract: A method is provided for facilitating radar detection robust to IQ imbalance. The method comprises the step of generating a radar signal in digital domain comprising a number of M periodic repetitions of a code sequence with a length Lc, multiplied with a progressive phase rotation e j · ? K · n , where Lc and M are integers, K is an integer or a non-integer, and n is a discrete integer variable. The method further comprises the step of generating a process input signal in digital domain from a reflection signal corresponding to the radar signal by multiplying the reflection signal with a progressive phase rotation e - j · ? K · n . In this context, K is defined such that a ratio Lc K is a non-integer, and M is defined such that a ratio Lc · M K is an integer.

Abstract: A method for facilitating robust radar detection comprises generating a radar signal in a digital domain along at least one transmission path, the radar signal comprises a number of M periodic repetitions of a code sequence with a length Lc, multiplied with a progressive phase rotation ej·?/K·n, where Lc and M are integers, K is an integer or a non-integer, and n is a discrete time index corresponding to a code rate. The method further comprises generating a process input signal in the digital domain along at least one receiving path from a digitized reflection signal corresponding to the radar signal by multiplying the digitized reflection signal with a progressive phase rotation e?j·?/K·n. In this context, K is defined such that a ratio Lc/2·K is a non-integer, and M is defined such that a ratio Lc·M/2·K is an integer.

Abstract: A system for providing distributed wireless communication for at least one user equipment with connectivity and/or security against at least one eavesdropper is provided. The system includes wireless communication units and a scheduling unit. In this context, the scheduling unit is configured to schedule a first subset of the wireless communication units for radar sensing in order to gather radar sensing information with respect to the at least one user equipment, the environment of the at least one user equipment, the at least one eavesdropper, the environment of the at least one eavesdropper, or any combination thereof. In addition to this, the scheduling unit is configured to schedule a second subset of the wireless communication units for distributing the wireless communication with respect to the at least one user equipment on the basis of the radar sensing information.

Abstract: A system for providing distributed communication with respect to a user equipment is provided. The system includes multiple communication units for distributing the communication with respect to the user equipment, a communication management unit connected to at least a pan of the multiple communication units in a connection line for managing the distributed communication, a connection unit including loss-inserting properties for connecting the multiple communication units to the connection line, an amplifying unit for being arranged with respect to the connection units, and a scheduling unit. The scheduling unit is configured to determine power loss with respect to the units on the basis of the corresponding loss-inserting properties and/or to schedule at least one of the multiple communication units and/or the at least one amplifying unit m order to compensate for power loss with respect to the at least one connection unit.

Abstract: A method is provided for indoor multipath ghosts recognition for a multiple-input-multiple-output radar with collocated antennas. The method includes the step of generating a two-dimensional Range-Doppler map for N number of consecutive radar data frames. The method further includes the step of applying a temporal clustering algorithm to the N number of consecutive radar data frames. Moreover, the method includes the step of applying a linear pattern extraction algorithm on the two-dimensional Range-Doppler map. In this context, the two-dimensional Range-Doppler map comprises detections from at least one target, at least one first-order ghost, and at least one second-order ghost with respect to one wall reflector.

Abstract: A method of radar ranging comprises transmitting a digitally-modulated signal comprising successively in time, for each sequence in a plurality N of sequences, a plurality M+1 of repeats of said sequence, wherein each said sequence consists of a plurality Lc of digitally-modulated chips, wherein at least one sequence in the plurality of sequences is different from another sequence in said plurality of sequences; receiving a version of the digitally-modulated signal reflected scattered by one or more physical targets; for each sequence in the plurality of sequences, performing a preliminary target estimation; and using each said preliminary target estimation for all sequences in the plurality of sequences, performing a final target estimation.

Abstract: An orthogonal frequency-division multiplexing (OFDM) based radar signal comprising Q sub-carriers adapted to push an IQ-imbalance component out of a subset of L contiguous range bins of range profiles derived out of the received radar signal and wherein L is at most Q/2, is disclosed

Abstract: In a radar system, a cancellation circuit is described for compensating for the effects of spillover between each transmitter and a receiver. The cancellation circuit is configured for applying cancellation signals to the receiver which are generated in a cancellation filter utilizing a primary impulse response characteristic corresponding to the spillover, a signal to be transmitted from each transmitter in the radar system, and a range profile output from the receiver. The cancellation circuit may also include a secondary impulse response characteristic module and a dithering module to improve the sensitivity of the receiver.

Abstract: Methods are described for the determination of a boundary of a space of interest using a radar sensor. In one aspect, a radar sensor scans and tracks all moving targets within the field of view and derives information relating to the tracked moving targets, such as, positional information and velocity information. From the positional and velocity information, regions which are not traversed by the tracked moving targets correspond to “no-go” regions. These “no-go” regions are used to derive a model for the space of interest which includes a boundary for the space of interest. The derived model is continuously updated due to the continuous detecting and tracking of moving targets within the field of view of the radar sensor. The detecting and tracking of moving targets can also be used to refine models of spaces of interest determined by another method.

Abstract: The present disclosure relates to a digital frontend system for a radio device comprising a digital filter arranged for receiving digital quadrature signals and for filtering the digital quadrature signals and for outputting filtered quadrature signals; a conversion circuit arranged for receiving the filtered quadrature signals and for performing a rectangular to polar conversion of the filtered quadrature signals and for outputting a plurality of polar signals, characterized in that, the plurality of polar signals comprising an amplitude signal and quadrature phase signals.

Abstract: The present disclosure relates to a digital frontend system for a radio device comprising a digital filter arranged for receiving digital quadrature signals and for filtering the digital quadrature signals and for outputting filtered quadrature signals; a conversion circuit arranged for receiving the filtered quadrature signals and for performing a rectangular to polar conversion of the filtered quadrature signals and for outputting a plurality of polar signals, characterized in that, the plurality of polar signals comprising an amplitude signal and quadrature phase signals.

Abstract: The present disclosure relates to a modulation circuit and a method for suppressing energy content of spectral side lobes caused by high-frequency content present in a baseband signal, with the energy content of the spectral side lobes being outside an intended operational bandwidth in a modulated radio-frequency signal. An example circuit is configured to: receive a digital baseband signal, feed the digital baseband signal to a first and a second signal path, with the first signal path comprising a first mixer and the second signal path comprising a delay circuit and a second mixer. The first mixer and the second mixer may receive a same local oscillator signal, and may respectively provide a first radio-frequency signal and a second radio-frequency signal that are delayed with respect to each other. The example circuit is further configured to generate an output radio-frequency signal by combining the first and second radio-frequency signals.

Abstract: The present disclosure relates to a modulation circuit and a method for suppressing energy content of spectral side lobes caused by high-frequency content present in a baseband signal, with the energy content of the spectral side lobes being outside an intended operational bandwidth in a modulated radio-frequency signal. An example circuit is configured to: receive a digital baseband signal, feed the digital baseband signal to a first and a second signal path, with the first signal path comprising a first mixer and the second signal path comprising a delay circuit and a second mixer. The first mixer and the second mixer may receive a same local oscillator signal, and may respectively provide a first radio-frequency signal and a second radio-frequency signal that are delayed with respect to each other. The example circuit is further configured to generate an output radio-frequency signal by combining the first and second radio-frequency signals.

Abstract: A method is disclosed for mixed analog/digital beamforming in a wireless communication system having transmit and receive antennas and analog front-ends connected to either the transmit antennas or the receive antennas.

Abstract: A circuit for adaptive feedback equalization is disclosed. In one aspect, the circuit includes a frequency-domain feedforward filtering section and a feedback filtering section, a slicer to slice a block of equalized symbols, a summing module for summing outputs of the filtering sections thereby yielding the block of equalized symbols. First and second updating modules provide coefficient updates to the filtering sections. The updating modules are fed with a frequency-domain converted block of error signals indicating the difference between the block of equalized symbols at the slicer input and the block of sliced symbols at the slicer output and for computing updates using the frequency-domain converted block of error signals. A time-domain compensation module receives a time-domain version of the updated filter coefficients of the feedback filtering section and symbols of the block of sliced symbols. It adds a feedback error compensation signal to the block of equalized symbols.

Abstract: A circuit for adaptive feedback equalization is disclosed. In one aspect, the circuit includes a frequency-domain feedforward filtering section and a feedback filtering section, a slicer to slice a block of equalized symbols, a summing module for summing outputs of the filtering sections thereby yielding the block of equalized symbols. First and second updating modules provide coefficient updates to the filtering sections. The updating modules are fed with a frequency-domain converted block of error signals indicating the difference between the block of equalized symbols at the slicer input and the block of sliced symbols at the slicer output and for computing updates using the frequency-domain converted block of error signals. A time-domain compensation module receives a time-domain version of the updated filter coefficients of the feedback filtering section and symbols of the block of sliced symbols. It adds a feedback error compensation signal to the block of equalized symbols.

Abstract: Embodiments of the present invention relate to methods and systems of transmitting data signals from at least one transmitting terminal with a spatial diversity capability to at least two receiving user terminals, each provided with spatial diversity receiving device. The methods and systems are useful, for example, in communication between terminals, e.g., wireless communication. In certain embodiments, transmission can be between a base station and two or more user terminals, wherein the base station and user terminals are each equipped with more than one antenna.