Abstract: A radio chain arrangement comprising at least two levels of radio chain entities. Each of the levels of radio chain entities is associated with a respective frequency range encompassing at least one radio frequency band each. At least two radio chain entities of a lower level of radio chains are comprised in a radio chain entity of a next higher level. Each radio chain entity of the at least two levels of radio chain entities comprises a respective radio transceiver arrangement that is connected to at least a respective one of a number of antenna multiplexers. For all radio chain entities except a lowest level, the respective radio transceiver arrangement is connected to the antenna multiplexers via a splitter arrangement. An active antenna system comprising such radio chain arrangements and a method for its operation is also disclosed.

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: A radio unit for unsynchronized Time Division Duplex (TDD) multi-band operation in a wireless communication system. The radio unit comprises a first resonator arrangement comprising one or more resonators tuned for operating at a first frequency band. A first terminal of the first resonator arrangement is coupled to an antenna element. The radio unit further comprises a second resonator arrangement comprising one or more resonators tuned for operating at a second frequency band. A first terminal of the second resonator arrangement is coupled to the antenna element. The radio unit further comprises a tunable resonator arrangement comprising at least four tunable resonators. The at least four tunable resonators in the tunable resonator arrangement are tuned according to different operating modes.

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: A radio chain arrangement comprising at least two levels of radio chain entities. Each of the levels of radio chain entities is associated with a respective frequency range encompassing at least one radio frequency band each. At least two radio chain entities of a lower level of radio chains are comprised in a radio chain entity of a next higher level. Each radio chain entity of the at least two levels of radio chain entities comprises a respective radio transceiver arrangement that is connected to at least a respective one of a number of antenna multiplexers. For all radio chain entities except a lowest level, the respective radio transceiver arrangement is connected to the antenna multiplexers via a splitter arrangement. An active antenna system comprising such radio chain arrangements and a method for its operation is also disclosed.

Abstract: A method for calibrating an active antenna system (AAS). The AAS comprises a radio unit and an antenna array. The radio unit comprises a plurality of transceiver branches. The method comprises calibrating at least one, but less then all, out of the plurality of transceiver branches as reference branch or branches. The method further comprises calibrating non-calibrated transceiver branch or branches out of the plurality of transceiver branches while the antenna array and the radio unit are connected. The disclosure further relates to a method for onsite automatic maintenance of an active antenna system, and to an active antenna system.

Abstract: A method performed by a radio network node for deciding an Automatic Gain Control (AGC) mode to be used for a received signal in a wireless communications network is provided. The radio network node estimates (301) a type of interference scenario affecting the received signal and obtains (302) information about channel quality of channels between the radio network node and connected wireless devices. Based on the estimated type of interference scenario and the obtained information about the channel quality, the radio network node dynamically decides (303) for the received signal, which AGC mode out of the following ACG modes to be used: —a slow AGC using a release timer for releasing an AGC state, —a fast AGC using a release timer for releasing an AGC state, and—a fast AGC using a trigger timer triggering an AGC state a first time interval before an interference period, and the release timer releasing the AGC state a second time interval after said interference period ends.

Abstract: A radio unit for unsynchronized Time Division Duplex (TDD) multi-band operation in a wireless communication system. The radio unit comprises a first resonator arrangement comprising one or more resonators tuned for operating at a first frequency band. A first terminal of the first resonator arrangement is coupled to an antenna element. The radio unit further comprises a second resonator arrangement comprising one or more resonators tuned for operating at a second frequency band. A first terminal of the second resonator arrangement is coupled to the antenna element. The radio unit further comprises a tunable resonator arrangement comprising at least four tunable resonators. The at least four tunable resonators in the tunable resonator arrangement are tuned according to different operating modes.

Abstract: A method for calibrating an active antenna system (AAS). The AAS comprises a radio unit and an antenna array. The radio unit comprises a plurality of transceiver branches. The method comprises calibrating at least one, but less then all, out of the plurality of transceiver branches as reference branch or branches. The method further comprises calibrating non-calibrated transceiver branch or branches out of the plurality of transceiver branches while the antenna array and the radio unit are connected. The disclosure further relates to a method for onsite automatic maintenance of an active antenna system, and to an active antenna system.

Abstract: A method performed by a radio network node for deciding an Automatic Gain Control (AGC) mode to be used for a received signal in a wireless communications network is provided. The radio network node estimates (301) a type of interference scenario affecting the received signal and obtains (302) information about channel quality of channels between the radio network node and connected wireless devices. Based on the estimated type of interference scenario and the obtained information about the channel quality, the radio network node dynamically decides (303) for the received signal, which AGC mode out of the following ACG modes to be used: —a slow AGC using a release timer for releasing an AGC state, —a fast AGC using a release timer for releasing an AGC state, and —a fast AGC using a trigger timer triggering an AGC state a first time interval before an interference period, and the release timer releasing the AGC state a second time interval after said interference period ends.

Abstract: The embodiments disclose a method and apparatus for automatic gain control. The apparatus comprises a first gain controlled element, a second gain controlled element, a first gain control device, a second gain control device and a first simulator. The first gain controlled element and the second gain controlled element each has a signal input, a gain control input and a signal output. The first gain controlled element and the second gain controlled element are coupled in series and one or more power elements coupled between the first gain controlled element and the second gain controlled element. The signal input of the first gain controlled element constitutes an input of the automatic gain control apparatus. The first gain control device has a pre-detection input which is coupled to the signal input of the first gain controlled element and an output which drives the gain control input of the first gain controlled element.

Abstract: A tower mounted amplifier and a filter. The filter includes a transmission part having a first tunable portion and a reception part having a second tunable portion and a third tunable portion. The transmission part is coupled between a first port and a second port. The second tunable portion of the reception part is coupled between the first port and a third port, and the third tunable portion of the reception part is coupled between a fourth port and the second port. The first tunable portion is configured to work in a first frequency range different from a first pass band in which the second and third tunable portions are controlled to work when a radio frequency signal is to be transmitted from the first port to the second port, the radio frequency signal being rejected by the first tunable portion to the second port.

Abstract: A high performance switch module to filter a radio frequency signal and to selectively connect to an output includes a filter unit and a plurality of switches. The filter unit has a filter configured to connect to the radio frequency signal and having a plurality of parallel output ports. The plurality of switches is connected between the plurality of parallel output ports and the output, the plurality of switches configured to connect to a control input to selectively connect an output port of the plurality of parallel output ports to the output and to selectively connect a remainder of the plurality of parallel output ports to a connection providing a substantially full reflection to the remainder of the plurality of parallel output ports of the filter unit.

Abstract: A filter comprises a first tunable portion connected to a transmitting module, a second tunable portion connected to a receiving module, and a fixed portion connected to an antenna unit. The first tunable portion is works in a first frequency range different from a first pass band in which the second tunable portion is controlled to work when the radio frequency signal is received via the antenna unit, such that the received radio frequency signal is rejected by the first tunable portion to the transmitting module. The second tunable portion works in a second frequency range different from a second pass band in which the first tunable portion is controlled to work when the radio frequency signal from the transmitting module is to be transmitted via the antenna unit, such that the radio frequency signal to be transmitted is rejected by the second tunable portion to the receiving module.

Abstract: The embodiments disclose a method and apparatus for automatic gain control. The apparatus comprises a first gain controlled element, a second gain controlled element, a first gain control device, a second gain control device and a first simulator. The first gain controlled element and the second gain controlled element each has a signal input, a gain control input and a signal output. The first gain controlled element and the second gain controlled element are coupled in series and one or more power elements coupled between the first gain controlled element and the second gain controlled element. The signal input of the first gain controlled element constitutes an input of the automatic gain control apparatus. The first gain control device has a pre-detection input which is coupled to the signal input of the first gain controlled element and an output which drives the gain control input of the first gain controlled element.

Abstract: A high performance switch module to filter a radio frequency signal and to selectively connect to an output includes a filter unit and a plurality of switches. The filter unit has a filter configured to connect to the radio frequency signal and having a plurality of parallel output ports. The plurality of switches is connected between the plurality of parallel output ports and the output, the plurality of switches configured to connect to a control input to selectively connect an output port of the plurality of parallel output ports to the output and to selectively connect a remainder of the plurality of parallel output ports to a connection providing a substantially full reflection to the remainder of the plurality of parallel output ports of the filter unit.

Abstract: The invention discloses a wideband receiver and a base station in a communication network. The wideband receiver comprises an Intermediate Frequency (IF) frequency control module, a frequency synthesizer, a mixer and an analog-to-digital converter (ADC). The IF frequency control module comprises an interference detector adapted to detect interference condition on at least one frequency band, and an IF frequency selector adapted to select an IF frequency based on the detected interference condition from the interference detector. The IF frequency is selected to avoid high interference mixed product of the mixer occurring in used channel. The frequency synthesizer generates an oscillator signal of the selected IF frequency, the mixer down converts a RF signal to an IF signal using the oscillator signal of the selected IF frequency, and the ADC converts the IF signal to baseband data.

Abstract: A tower mounted amplifier and a filter The filter includes a transmission part having a first tunable portion and a reception part having a second tunable portion and a third tunable portion. The transmission part is coupled between a first port and a second port. The second tunable portion of the reception part is coupled between the first port and a third port, and the third tunable portion of the reception part is coupled between a fourth port and the second port. The first tunable portion is configured to work in a first frequency range different from a first pass band in which the second and third tunable portions are controlled to work when a radio frequency signal is to be transmitted from the first port to the second port, the radio frequency signal being rejected by the first tunable portion to the second port.

Abstract: Present invention provides a multi-band receiver for receiving and processing different frequency band signals, which comprises: a direct sampling module, for receiving and processing a low frequency band input signal from a first antenna; at least one single down conversion module, for receiving and processing a high frequency band input signal from a second antenna; a combiner coupled to the direct sampling module and the at least one single down conversion module, for combining the low frequency band input signal received from the direct sampling module and the high frequency band input signal received from the at least one single down conversion module; an Analog Digital Converter (ADC) coupled to the combiner, for converting analog signal received from the combiner into digital signal.

Abstract: A radio module comprises a top board (110) with all components mounted on a front surface (111) and a metal substrate on a back surface (112); a bottom board (120) with all components mounted on a front surface (121) and a metal substrate on a back surface (122), wherein the bottom board (120) is arranged so that the front surface (121) of the bottom board (120) is opposite to the front surface (111) of the top board (110); and at least one shielding board (130) provided between the top board (110) and the boom board (120) with certain vertical spacing. The top board (110), the bottom board (120), and the at least one shielding board (130) are arranged to be substantially in alignment in a vertical direction and be fastened with one another. A board-board electrical connection (140-1, 140-2) is established at least between the top board (110) and the bottom board (120).