Abstract: A method for antenna calibration for an active antenna system is disclosed. According to an embodiment, test signals are generated for multiple antennas of the active antenna system. The test signals are transmitted via the multiple antennas. A first signal that results from the transmission of the test signals is received over the air. A second signal is received from a coupler network of the active antenna system. The coupler network is configured to generate coupled signals of the test signals and combine the coupled signals into the second signal. Calibration information for compensating an influence of the coupler network is determined based on the first and second signals. An active antenna system is also disclosed for use in antenna calibration.

Abstract: A method of calibrating an antenna array in a wireless network node is disclosed, the wireless network node including a plurality of antenna branches, each of the plurality of antenna branches including a respective antenna element. The method includes repeating operations of transmitting a slice of a fountain coded sequence through the plurality of antenna branches to the respective antenna elements, and for each antenna branch of the plurality of antenna branches, selecting the transmitted slice as a feedback signal through a return path and determining a signal quality of the feedback signal, until the signal quality of the feedback signal for each antenna branch is greater than a threshold level. The method further includes performing antenna calibration based on the feedback signal for each antenna branch. Related devices, computer programs and computer program products are disclosed.

Abstract: Embodiments of the present disclosure provide method and apparatus for antenna calibration. A method implemented at a first network device. The method includes receiving a first radio signal generated by the first network device via a receiver connected to an antenna of the first network device. The method further includes receiving at least one second radio signal from at least one second network device via the antenna of the first network device. The method further includes determining an impairment related to the antenna of the first network device based on the received first radio signal and the at least one second radio signal. There is a line of sight (LOS) path between the antenna of the first network device and the antenna of each of the at least one second network device.

Abstract: The present disclosure provides a method (400) for facilitating Antenna Calibration, AC. The method (400) includes: identifying (410) a leakage signal from a signal received at an AC signal receiver and resulted from a reference signal originated from an AC signal transmitter passing through an AC signal path from the AC signal transmitter to the AC signal receiver; and cancelling (420) an influence of the leakage signal on an AC process.

Abstract: It provides a method (300) for polar decoding a received signal into a number, N, of bits with Successive Cancellation List, SCL. The method (300) includes: at the i-th level of a binary tree for decoding the i-th bit of the N bits, where 1?i?N: when the i-th bit is an information bit, calculating (310) a path metric for each of 2*Li-1 candidate paths at the i-th level, where Li-1 is an SCL size at the (i?1)-th level and L0=1; setting (320) an SCL size at the i-th level, Li, based on Li-1 and a statistical distribution of the path metrics calculated for the 2*Li-1 candidate paths; and selecting (330) Li surviving paths from the 2*Li-1 candidate paths based on their respective path metrics.

Abstract: Embodiments of the present disclosure provide methods and apparatus for antenna calibration. A method implemented at a network function comprises calibrating an antenna of the network function based on available time-frequency resources. The method further comprises communicating with at least one terminal device via the calibrated antenna.

Abstract: Various embodiments of the present disclosure provide a method for multi-antenna transmission. The method which may be performed by a communication device comprises determining first correlation information in response to interference to data on a first subset of multiple antenna branches of the communication device. The first correlation information may indicate at least correlation between the data on the first subset of the multiple antenna branches and data on a second subset of the multiple antenna branches which is not affected by interference. The method further comprises correcting the data on the first subset of the multiple antenna branches, based at least in part on the first correlation information.

Abstract: Embodiments of the present disclosure provide methods and apparatus for antenna calibration. A method implemented at a network function comprises calibrating an antenna of the network function based on available time-frequency resources. The method further comprises communicating with at least one terminal device via the calibrated antenna.

Abstract: In one example aspect, a method is provided of preparing a symbol for transmission, the method comprising applying a window function to a symbol to generate a modified symbol, wherein a property of the window function is based on a channel length of a transmission channel over which the modified symbol is to be transmitted, and causing the modified symbol to be transmitted over the transmission channel.

Abstract: A method of calibrating an antenna array in a wireless network node is disclosed, the wireless network node including a plurality of antenna branches, each of the plurality of antenna branches including a respective antenna element. The method includes repeating operations of transmitting a slice of a fountain coded sequence through the plurality of antenna branches to the respective antenna elements, and for each antenna branch of the plurality of antenna branches, selecting the transmitted slice as a feedback signal through a return path and determining a signal quality of the feedback signal, until the signal quality of the feedback signal for each antenna branch is greater than a threshold level. The method further includes performing antenna calibration based on the feedback signal for each antenna branch. Related devices, computer programs and computer program products are disclosed.

Abstract: Various embodiments of the present disclosure provide a method for multi-antenna transmission. The method which may be performed by a communication device comprises determining first correlation information in response to interference to data on a first subset of multiple antenna branches of the communication device. The first correlation information may indicate at least correlation between the data on the first subset of the multiple antenna branches and data on a second subset of the multiple antenna branches which is not affected by interference. The method further comprises correcting the data on the first subset of the multiple antenna branches, based at least in part on the first correlation information.

Abstract: A method for antenna calibration for an active antenna system is disclosed. According to an embodiment, test signals are generated for multiple antennas of the active antenna system. The test signals are transmitted via the multiple antennas. A first signal that results from the transmission of the test signals is received over the air. A second signal is received from a coupler network of the active antenna system. The coupler network is configured to generate coupled signals of the test signals and combine the coupled signals into the second signal. Calibration information for compensating an influence of the coupler network is determined based on the first and second signals. An active antenna system is also disclosed for use in antenna calibration.

Abstract: A method for antenna calibration for an active antenna system is disclosed. According to an embodiment, test signals are generated for multiple antennas of the active antenna system. The test signals are transmitted via the multiple antennas. A first signal that results from the transmission of the test signals is received over the air. A second signal is received from a coupler network of the active antenna system. The coupler network is configured to generate coupled signals of the test signals and combine the coupled signals into the second signal. Calibration information for compensating an influence of the coupler network is determined based on the first and second signals. An active antenna system is also disclosed for use in antenna calibration.

Abstract: In one example aspect, a method is provided of preparing a symbol for transmission, the method comprising applying a window function to a symbol to generate a modified symbol, wherein a property of the window function is based on a channel length of a transmission channel over which the modified symbol is to be transmitted, and causing the modified symbol to be transmitted over the transmission channel.

Abstract: A method for antenna calibration for an active antenna system is disclosed. According to an embodiment, test signals are generated for multiple antennas of the active antenna system. The test signals are transmitted via the multiple antennas A first signal that results from the transmission of the test signals is received over the air. A second signal is received from a coupler network of the active antenna system. The coupler network is configured to generate coupled signals of the test signals and combine the coupled signals into the second signal. Calibration information for compensating an influence of the coupler network is determined based on the first and second signals. An active antenna system is also disclosed for use in antenna calibration.

Abstract: It provides a method (300) for polar decoding a received signal into a number, N, of bits with Successive Cancellation List, SCL. The method (300) includes: at the i-th level of a binary tree for decoding the i-th bit of the N bits, where 1?i?N: when the 1-th bit is an information bit, calculating (310) a path metric for each of 2*Li-1 candidate paths at the i-th level, where Li-1 is an SCL size at the (i?1)-th level and L0=1; setting (320) an SCL size at the i-th level, Li, based on Li-1 and a statistical distribution of the path metrics calculated for the 2*Li-1 candidate paths; and selecting (330) Li surviving paths from the 2*Li-1 candidate paths based on their respective path metrics.

Abstract: A method for compressing IQ data for high speed transport link and an associated device. The method comprises: determining, based on dynamical statistical distribution of the IQ data, one or more parameters of a companding function for a nonlinear companding operation (S310); applying the companding function with the determined one or more parameters on the IQ data (S320); performing uniform quantization on the IQ data to generate compressed IQ data (S330); and transmitting the compressed IQ (S340). And a method for decompressing compressed IQ data for high speed transport link, and an associated device.

Abstract: A method for compressing IQ data for high speed transport link and an associated device. The method comprises: determining, based on dynamical statistical distribution of the IQ data, one or more parameters of a companding function for a nonlinear companding operation (S310); applying the companding function with the determined one or more parameters on the IQ data (S320); performing uniform quantization on the IQ data to generate compressed IQ data (S330); and transmitting the compressed IQ (S340). And a method for decompressing compressed IQ data for high speed transport link, and an associated device.