Abstract: The disclosure presents a method and system for enabling the monitoring of more than one propagation link (PL) between two transceivers, such as a fifth-generation (5G) broadband cellular base station (gNB) and user equipment (UE). The PL can represent a radiation pattern emitted by a MIMO antenna port. The monitoring can capture and record PL quality parameters and associate them to a PL index (PLI). The process can periodically cycle through the set of available PLs and select a best fit PLI configuration. The best fit PLI can be one that satisfies a link quality threshold and PL efficiency thresholds. The selected PLI can be communicated to both transceivers using parameter containers added to conventional control signals. Data messages communicated between the transceivers can utilize the selected best fit PLI configuration.

Abstract: Apparatus for receiving radio frequency, RF, signals, comprising at least two antenna panels, wherein each of the at least two antenna panels is configured to provide a respective received signal with an associated frequency spectrum, wherein the apparatus is configured to apply a frequency shift to at least one of the received signals such that center frequencies of at least two adjacent frequency spectra comprise a predetermined frequency distance from each other.

Abstract: An apparatus, a method and a computer program is described comprising: receiving a plurality of synchronisation symbol blocks; classifying the received synchronisation symbol blocks based on delay relative to an expected reception time; and identifying one or more candidate line of sight paths on the basis of the delay relative to the expected reception time.

Abstract: The disclosure presents a method and system for enabling the monitoring of more than one propagation link (PL) between two transceivers, such as a fifth-generation (5G) broadband cellular base station (gNB) and user equipment (UE). The PL can represent a radiation pattern emitted by a MIMO antenna port. The monitoring can capture and record PL quality parameters and associate them to a PL index (PLI). The process can periodically cycle through the set of available PLs and select a best fit PLI configuration. The best fit PLI can be one that satisfies a link quality threshold and PL efficiency thresholds. The selected PLI can be communicated to both transceivers using parameter containers added to conventional control signals. Data messages communicated between the transceivers can utilize the selected best fit PLI configuration.

Abstract: An apparatus is provided that includes a ground plane having a perimeter, at least one support positioned within the perimeter of the ground plane and extending outwardly from the ground plane and at least one multi-port antenna supported by the support at a distance from the ground plane. The multi-port antenna has a different radiation pattern associated with each port. The multi-port antenna operates with a first radiation pattern when a first port is used and operates with a second radiation pattern, different to the first radiation pattern, when a second port, different to the first port, is used. The at least one support defines a slot positioned between the multi-port antenna and the ground plane and/or the ground plane defines a slot.

Abstract: Apparatus for transmitting and/or receiving radio frequency, RF, signals, particularly for a mobile radio device for a wireless communications system, particularly a cellular communications system, said apparatus comprising a primary antenna module having a first radiation pattern, at least one secondary antenna module having a second radiation pattern, which is different from said first radiation pattern, and a control unit configured to selectively activate and/or deactivate said primary antenna module and/or said at least one secondary antenna module.

Abstract: A method, apparatus, and computer-readable storage medium are provided for selecting a target cell based on channel impulse response (CIR) measurements, which may include receiving measurement configuration information including a CIR parameter from a first network node and may further include generating one or more measurement reports based on the CIR parameter, the one or more measurement reports including CIR measurements of one or more beams of one or more neighbor cells associated with the first network node and/or second network nodes and transmitting the one or more measurement reports to the first network node. The selecting a target cell based on CIR measurements may include transmitting measurement configuration information including a CIR parameter and receiving one or more measurement reports, including CIR measurements of one or more beams of one or more network nodes and selecting a target cell for handover using the measurements.

Abstract: A method of estimating a channel for mobile systems with insufficient cyclic prefix length, wherein the channel comprises a plurality of multipath components (?,?), includes: receiving a signal (yn) comprising a plurality of contributions of a transmit signal (xn[k], xn-1[k]) transmitted during a plurality of transmission time intervals (n, n?1) on a plurality of sub-carriers of known pilots (k?Pb) and a plurality of sub-carriers of unknown data (k?Pb); determining an estimate of the plurality of multipath components (?,?) based on a probabilistic relation between the plurality of first contributions (xn[k], xn-1[k]) of the transmit signal, wherein the plurality of first contributions are transmitted during adjacent transmission time intervals (n, n?1), and an observation of the received signal (yn[k]) at a subcarrier (k?Pb) of the known pilots, wherein the probabilistic relation is based on statistical properties of the plurality of first contributions (xn[k], xn-1[k]) of the transmit signal.

Abstract: A method of estimating a channel for mobile systems with insufficient cyclic prefix length, wherein the channel comprises a plurality of multipath components (?,?), includes: receiving a signal (yn) comprising a plurality of contributions of a transmit signal (xn[k], xn-1[k]) transmitted during a plurality of transmission time intervals (n, n-1) on a plurality of sub-carriers of known pilots (k?Pb) and a plurality of sub-carriers of unknown data (k?Pb); determining an estimate of the plurality of multipath components (?,?) based on a probabilistic relation between the plurality of first contributions (xn[k], xn-1[k]) of the transmit signal, wherein the plurality of first contributions are transmitted during adjacent transmission time intervals (n, n-1), and an observation of the received signal (yn[k]) at a subcarrier (k?Pb) of the known pilots, wherein the probabilistic relation is based on statistical properties of the plurality of first contributions (xn[k], xn-1[k]) of the transmit signal.

Abstract: A method for processing a plurality of signals may include receiving one or more observations characterizing a wireless channel, performing a channel estimation to determine a probabilistic channel model for the wireless channel, and processing the plurality of signals using the probabilistic channel model. The channel estimation may include numerically updating one or more multipath gain estimates and one or more multipath delay estimates based on the one or more received observations and a probability distribution associated with the probabilistic channel model.

Abstract: Natural radio environments are emulated using field traces and a channel emulator to test radio devices. In one example, a test includes a field trace source to replay recorded field traces, a protocol tester to receive the replayed field traces to extract configuration parameters from the replayed field traces, to extract signals from the field traces, to send the signals to a device under test, and to receive signals from the device under test, and a channel emulator coupled to the field trace source, and between the protocol tester and the device under test, to receive the replayed field traces, to mix the replayed field traces with signals and to emulate the channel between the protocol tester and the device under test.

Abstract: A method (200) for channel estimation includes receiving (201) a receive symbol (206) comprising: a plurality of interfering transmissions from: a first transmit symbol (202), the first transmit symbol (202) comprising a plurality of unknown modulated symbols interleaved with a plurality of known modulated symbols and a second transmit symbol (204), the second transmit symbol (204) comprising a plurality of unknown modulated symbols interleaved with a plurality of known modulated symbols, wherein the plurality of transmissions from the first transmit symbol (202) and the second transmit symbol (204) are a plurality of transmissions of different time instances; and estimating (203) a channel based on the receive symbol (206) and a plurality of estimates of the first transmit symbol (202) and the second transmit symbol (204).

Abstract: Natural radio environments are emulated using field traces and a channel emulator to test radio devices. In one example, a test includes a field trace source to replay recorded field traces, a protocol tester to receive the replayed field traces to extract configuration parameters from the replayed field traces, to extract signals from the field traces, to send the signals to a device under test, and to receive signals from the device under test, and a channel emulator coupled to the field trace source, and between the protocol tester and the device under test, to receive the replayed field traces, to mix the replayed field traces with signals and to emulate the channel between the protocol tester and the device under test.

Abstract: A method for processing one or more received radio signals is provided. The method may include performing a channel estimation of a transmission channel for at least a portion of the one or more radio signals received, to identify at least one soft channel parameter representing a channel impulse response of the transmission channel, and identifying at least one soft intercarrier interference parameter representing an interference for the one or more radio signals received using a first frequency carrier. The interference is caused by the one or more radio signals received using a second frequency carrier. The method may further include detecting soft data from the one or more radio signals based at least on the at least one soft channel parameter and the at least one soft intercarrier interference parameter.

Abstract: Natural radio environments are virtualized to test radio devices. In one example, this is done by extracting signals and messages recorded in the field and injecting them in the operation of a protocol tester. In another example, the radio environment is reproduced by generating channel impulse responses in a ray-tracer, then interpolating them in a channel emulator and supporting the interpolation by means of post-processing. In another example, the radio environment is recorded using a mobile terminal in the field. In another example, natural radio environments are produced by reconstructing realistic cell loads and, as a consequence, intra-cell interference for a given device under test.

Abstract: A method for processing one or more received radio signals is provided. The method may include performing a channel estimation of a transmission channel for at least a portion of the one or more radio signals received, to identify at least one soft channel parameter representing a channel impulse response of the transmission channel, and identifying at least one soft intercarrier interference parameter representing an interference for the one or more radio signals received using a first frequency carrier. The interference is caused by the one or more radio signals received using a second frequency carrier. The method may further include detecting soft data from the one or more radio signals based at least on the at least one soft channel parameter and the at least one soft intercarrier interference parameter.

Abstract: A method (200) for channel estimation includes receiving (201) a receive symbol (206) comprising: a plurality of interfering transmissions from: a first transmit symbol (202), the first transmit symbol (202) comprising a plurality of unknown modulated symbols interleaved with a plurality of known modulated symbols and a second transmit symbol (204), the second transmit symbol (204) comprising a plurality of unknown modulated symbols interleaved with a plurality of known modulated symbols, wherein the plurality of transmissions from the first transmit symbol (202) and the second transmit symbol (204) are a plurality of transmissions of different time instances; and estimating (203) a channel based on the receive symbol (206) and a plurality of estimates of the first transmit symbol (202) and the second transmit symbol (204).

Abstract: A method for processing a plurality of signals may include receiving one or more observations characterizing a wireless channel, performing a channel estimation to determine a probabilistic channel model for the wireless channel, and processing the plurality of signals using the probabilistic channel model. The channel estimation may include numerically updating one or more multipath gain estimates and one or more multipath delay estimates based on the one or more received observations and a probability distribution associated with the probabilistic channel model.

Abstract: A method includes determining a sequence of first coefficient estimates of a communication channel based on a sequence of pilots arranged according to a known pilot pattern and based on a receive signal, wherein the receive signal is based on the sequence of pilots transmitted over the communication channel. The method further includes determining a sequence of second coefficient estimates of the communication channel based on a decomposition of the first coefficient estimates in a dictionary matrix and a sparse vector of the second coefficient estimates, the dictionary matrix including filter characteristics of at least one known transceiver filter arranged in the communication channel.

Abstract: In an embodiment, a radio device is provided. The radio device may include a signal transmitter configured to transmit a plurality of signals, the signals being transmitted with different intensities; a response receiver configured to receive a response message to one of the transmitted signals from a radio communication device having received the respective transmitted signal of the plurality of transmitted signals, the response message identifying the received message; and a assessment circuit configured to assess the reachability of the radio communication device from the radio device based on the intensity of the signal to which the radio communication device has responded.