Embodiments include methods for determining intermodulation distortion (IMD) present in an uplink channel received by a network node in a wireless communication network. Such embodiments include, for each of a plurality of time period pairs comprising first and second time periods: measuring a first parameter for an uplink channel received and a second parameter for each of a plurality of downlink channels transmitted by the network node; and for the uplink channel, determining a first difference between the first parameter measured during the first time period and the first parameter measured during the second time period. Such embodiments also include, based on the first difference and the second parameters, determining a predictive model for an IMD signal, associated with the downlink channels, that can be received by the network node in the uplink channel. For example, the predictive model can be used to adjust transmitter settings to improve IMD performance.

A method and network node for detection of passive intermodulation (PIM) are disclosed. According to one aspect, a method includes determining values of a covariance matrix based at least in part on uplink signals received by the network node radio. The method also includes determining a plurality of uplink (UL) channel 5 eigenvalues based at least in part on an eigen-component acquisition technique. The method further includes determining a presence or absence of PIM based at least in part on a plurality of the UL channel eigenvalues.

A receiving device is provided. The receiving device includes an antenna device, a filter circuit, a transceiver, an adjustable attenuator, a circulator, and a processor. The antenna device receives a received signal. The filter circuit separates an in-band signal and an out-band signal from the received signal. The adjustable attenuator adjusts the attenuation value corresponding to the in-band signal and transmits the adjusted in-band signal to the transceiver. The circulator receives the received signal from the antenna device and transmits the received signal to the filter circuit, and the circulator receives a reflected signal from the filter circuit. The processor determines how to adjust the attenuation value corresponding to the in-band signal according to information related to the out-band signal and information related to the in-band signal that has been processed by the adjustable attenuator and the transceiver.

An electronic device is provided. The electronic device may include a plurality of antennas configured to transmit and receive a signal in a radio frequency (RF) frequency band; and an RF circuit configured to process the signal in the RF frequency band. The RF circuit includes a reception (Rx) path configured to transfer a first signal received through the plurality of antennas, a transmission (Tx) path configured to transfer a second signal to the plurality of antennas, and a coupler configured to transfer at least a part of the second signal obtained in the Tx path to the Rx path. The Tx path includes a power divider configured to distribute power to at least one antenna among the plurality of antennas, and the coupler is electrically connected to an input terminal of the power divider to be disposed before the power divider.

A method for indicating inter-modulation distortion (IMD) includes: sending a query request to user equipment (UE) when a second base station is to be configured for the UE, the query request being used for querying whether IMD will be generated for downlink reception when the UE simultaneously performs uplink transmission on a uplink frequency band combination to be configured by a first base station and the second base station; receiving a determining result fed back by the UE according to the query request; and configuring uplink transmission and downlink reception for the UE on a corresponding frequency band according to the received determining result. As such, signaling overhead of a system can be greatly reduce, and the occurrence of IMD can be avoided.

A method for communication control includes: receiving indication information which is related to uplink transmission denial information and is sent by a first base station; determining a communication resource corresponding to the uplink transmission denial information; and denying transmission of uplink information via the communication resource according to the indication information. As such, indication information related to uplink transmission denial information is received, and a communication resource corresponding to the uplink transmission denial information is determined, and then it is possible to deny transmission of uplink information via the communication resource according to the indication information.

An optical-electronic integrated RF leakage interference cancellation system and method for continuous wave radars belongs to the technical filed of radars. The optical-electronic integrated RF leakage interference cancellation system cancels the RF leakage interference by integrating of the microwave photonic link and the cable link. The microwave photonic link implements the phase adjustment, time delay adjustment and amplitude adjustment of the microwave signal tapped from the continuous wave source in the transmitter and realizes the cancellation matching conditions of the out of phase, the matching delay time and the same amplitude with the leakage interference signal. It has the advantages of broad frequency band, large bandwidth, and high tuning resolution, which enables the effective suppression of the RF leakage interference and ensures the high transmit-to-receive isolation for continuous wave radars.

A method and apparatus are provided. an indication of a first uplink resource allocation of resource blocks for a transmission on a first carrier, and an indication of a second uplink resource allocation of resource blocks for a transmission on a second carrier are received. An indication of a downlink allocation for receiving a downlink signal is further received. A higher order intermodulation product, which is co-located with a lower order intermodulation product for the first and second allocations resulting from any respective higher order and lower order transceiver nonlinearities is identified. A determination is then made as to whether the co-located higher order intermodulation products have a region of overlap with the downlink allocation. When the co-located higher order intermodulation products have a region of overlap with the downlink allocation, adjustments in the operation are made to account for the overlap of the higher order intermodulation product and the downlink allocation.

A reception device includes an interference cancellation unit to extract a symbol from a received signal with a first signal inserted in a time direction of a data symbol, the symbol being a signal during an interval corresponding to the first signal, to reproduce an interference signal during an interval corresponding to the data symbol, and to output a first interference-cancelled signal obtained by extracting the data symbol from a signal obtained by cancelling the interference signal from the received signal, and an interference-power estimation unit to estimate desired signal power by subtracting second average power of a symbol of a first signal, extracted from the received signal, from first average power the data symbol to estimate first noise power by subtracting the desired signal power from third average power of the data symbol, to estimate second noise power from the first noise power, and to estimate interference power by subtracting the second noise power from the second average power.

A receiving device is provided. The receiving device includes an antenna device, a filter circuit, a transceiver, an adjustable attenuator, a circulator, and a processor. The antenna device receives a received signal. The filter circuit separates an in-band signal and an out-band signal from the received signal. The adjustable attenuator adjusts the attenuation value corresponding to the in-band signal and transmits the adjusted in-band signal to the transceiver. The circulator receives the received signal from the antenna device and transmits the received signal to the filter circuit, and the circulator receives a reflected signal from the filter circuit. The processor determines how to adjust the attenuation value corresponding to the in-band signal according to information related to the out-band signal and information related to the in-band signal that has been processed by the adjustable attenuator and the transceiver.