Abstract: An active antenna array comprises a plurality of transmission paths, a predistortion modulation signal generator, and a predistortion modulation signal distribution structure. At least two of the plurality of transmission paths comprise a predistortion modulator for modulating a transmission path signal with a predistortion modulation signal generated by the predistortion modulation signal generator and distributed by predistortion modulation signal distribution structure to the at least two of the plurality of transmission paths. A method for predistorting at least two of a plurality of transmission path signals in an active antenna array and computer program products for manufacture and method execution are also claimed.

Abstract: The present disclosure provides a duplexer for separating a transmit signal and a receive signal. The duplexer comprises a transmit filter, a receive filter and an analogue quadrature splitter, a first filtering element and a second filtering element. By choosing the first filtering element and the second filtering element substantially identical, it is possible to transform filtering characteristics of the first and second filtering element such that stop bands are substantially transformed into an effective pass band, and vice versa. The analogue quadrature splitter is adapted to increase an attenuation of the transmit signals outside the transmit band, such as in the receive band. Therefore out-of-band emissions by the transmitter will be substantially reduced. The present disclosure further provides a method for separating a transmit signal and a receive signal, and computer program products for the manufacture for carrying out the method of separating transmit signals and receive signals.

Abstract: The disclosure relates to an active antenna array for a mobile communication system which comprises a plurality of receive paths, a control unit for generating a sounding signal, and a coupler for coupling the sounding signal into at least one of a plurality of receive paths. A switch is used to switch the output of one the plurality of receive paths between one of a receiver and a calibration unit. The disclosure also provides a method for the calibration of the active antenna array which comprises generating an initial sounding signal, coupling the initial sounding signal into at least one of a plurality of receive paths to generate an adjusted sounding signal, comparing the adjusted sounding signal with an initial sounding signal and then generating calibration parameters.

Abstract: The disclosure relates to an active antenna array for a mobile communication system which comprises a plurality of receive paths, a sounding signal generator generating a sounding signal, and a coupler for coupling the sounding signal into at least one of a plurality of receive paths. A sounding signal extractor substantially removes the sounding signal from digitized ones of the receive signals to form a wanted signal. The disclosure also provides a method for the calibration of the receive path of the active antenna array.

Abstract: Digital Transceiver (DTRX) usable in a radio communications systems for transmitting and receiving digital base-band signals, wherein the DTRX (300) comprises: at least one digital up-converter (DUC) (310) for transmitting digital base-band signals and at least one digital down-converter for receiving digital base-band signals. In one aspect of the teachings disclosed herein the DUC (310) comprises at least two over-sampling units (314, 315), at least one quadrature modulation unit (340), and at least one time-discrete sigma delta band-pass modulator (318). The digital down-converter comprises at least one quadrature demodulation unit (360), at least two decimator units (356,357), and at least two sub-sampling units (354, 355). The digital base-band signal comprises an in-phase component (I-signal) and a quadrature component (Q-signal).

Abstract: A radio transceiver comprising at least two individual receive paths and at least two individual transmit paths is disclosed. The radio transceiver includes a first filter arrangement for separating individual ones of the at least two individual transmit paths from a combined one of the at least two individual receive paths, a splitter for splitting the combined one of the at least two receive paths into the individual receive paths; and a second filter arrangement for separating combined receive bands on the combined one of the at least two receive paths into individual receive bands on the individual receive paths. A method for the reception of combined receive signals in at least two receive frequency bands is also disclosed.

Abstract: Transmitter comprising a delta-sigma modulator (DSM), a sample rate converter (SRC) situated downstream of the delta-sigma modulator with respect to a direction of transmission signal flow, and a switching amplifier (SA) situated downstream of the sample rate converter (SRC) with respect to the direction of transmission signal flow. The invention as defined above allows for a decoupling of the clock frequency of the delta-sigma modulator (DSM) and the carrier frequency, for example in radio frequency (RF) signal generation applications using delta-sigma modulators. With the invention described herein it is possible to design the delta-sigma modulator independently of the carrier frequency.

Abstract: An active antenna array comprises a plurality of transmission paths, a plurality of variable power supply units, and an envelope detection system. The transmission paths are adapted to carry a plurality of similar transmission path signals, and the plurality of transmission paths comprises an amplifier having a power input and a signal input for one of the plurality of similar transmission path signals. The plurality of variable power supply units is connected to the power input of the amplifier for supplying power to the amplifiers. Each of the plurality of variable power supply units comprises an envelope signal input. The envelope detection system is connected to the envelope inputs of the plurality of variable power supply units and adapted to provide a common envelope signal for the plurality of similar transmission path signals to the plurality of variable power supply units. A method for envelope tracking and computer program products for manufacture and method execution are also claimed.

Abstract: The present invention provides a radio system and a method for relaying radio signals. The radio system comprises at least one transmit path, a digital predistortion unit, a calibration unit and a feedback path. The feedback path is commonly used by the digital predistortion unit and the calibration unit with the present invention. The calibration signal is adapted to update at least one of phase and amplitude changes and the digital predistortion. The present invention further relates to a method for relaying radio signals. The method comprises updating the digital predistortion as well as an updating of the phase and amplitude changes. The updating of the digital predistortion and the updating of the phase and amplitude changes is implemented using a feedback signal. The present invention further relates to a computer program product for the manufacture of the radio system according to the invention.

Abstract: The application relates to a method for operation of an active antenna array and to an active antenna system. The active antenna system has a signal processing unit and an active antenna array adapted to be operated with a main antenna pattern correlated to a main receive beam and with at least one test antenna pattern correlated to a test receive beam having an orientation different from the main receive beam. A main radio frequency signal is received based on the main antenna pattern and a test radio frequency signal is received based on the test antenna pattern. The main radio frequency signal comprises communications traffic. Performance of the main receive beam is assessed based on the main radio frequency signal and performance of the test receive beam is assessed based on the test radio frequency signal. The main antenna pattern is adjusted based on a comparison of the performance of the main receive beam and test receive beam.

Abstract: The application relates to a calibration apparatus and calibration method for a tuneable resonator of a delta-sigma modulator of the continuous time, band pass type. The calibration apparatus comprises: a resonator driver capable of causing an oscillating behavior in a resonator output signal, a reference signal source that provides a reference signal, a frequency detector that provides a frequency relation signal corresponding to the frequency relation between the resonator output signal and the reference signal, and a controller that controls the tuneable resonator in dependence from the frequency relation signal so as to reduce frequency deviation.

Abstract: The present invention provides a radio system and a method for relaying radio signals, providing a power calibration of transmit radio signals. With the radio system and the method no dedicated calibration signal generator is required for providing the power calibration of the transmit radio signals. The radio system comprises at least one transmit path, a calibration unit at the least one link and a power sensor. A selected one of coupled transmit signals is forwarded to a power sensor for measuring a power level of a portion of the selected one of the coupled transmit signals, wherein the calibration unit is adapted to update a power rating of the at least one transmit path in response to the transmit power level of the selected one of the coupled transmit signals.

Abstract: A power distribution for an array of active electronic circuits in an antenna of a mobile communications base-station is disclosed. The power distribution comprises a first conductor connectable to a first terminal of a power supply unit, and a second conductor connectable to a second terminal of the power supply unit. The first conductor and the second conductor are at least partly bare and rigid, and are routed to the antenna-embedded radios in a manner separate from each other.

Abstract: An interference canceller between a transmit chain and a receive chain of a transceiver is proposed to complement the action of a diplexer, or duplex filter, that is part of the transceiver. The interference canceller comprises a transmit chain tap, a receive chain coupler for coupling an interference compensation signal into the receive chain, and an interference signal processing path between the transmit chain tap and the receive chain coupler. The interference signal processing path comprises a filter having filtering characteristics similar or corresponding to the filtering characteristic of a receive portion of said diplexer. A corresponding method for interference cancellation is also proposed. Computer-program products for the manufacture of the interference canceller and the execution of the method are also proposed.

Abstract: An antenna array (10) for the transmission of signals (20) is disclosed. The antenna array (10) comprises: a plurality of transmission paths (30-1, 30-2, 30-K) for transmitting a plurality of wanted signals (25) and at least one calibration signal generator (40-1, 40-2, 40-K) for the generation of at least one calibration signal (45). A plurality of calibration signal mixers (50-1, 50-2, 50-K) mixes the at least one calibration signal (45) with the plurality of wanted signals (25) to produce a plurality of transmission signals (20). A path sum signal device (60) sum the plurality of transmission signals (20) to produce a summed transmission signal (65); and an interference estimator (90) accepts the at least one calibration signal (45) and generates an estimated interference signal (92).

Abstract: A digital sigma-delta modulator (100) for modulating a digital input signal (x) is described. The digital sigma-delta modulator (100) comprises a quantizer (115) for quantizing an input signal (s) and producing a quantized output signal (y) at a first output (110) and an error output signal (?q) at a second output (165), at least one feedback loop (120, 125) connected to an input adder (140) and the first outputs (110) and the second output (165) of the quantizer (115) and a feedback filter (130, 135) in the at least one feedback loop (120, 125). The input adder (140) produces the sum signal (s) by adding the digital input signal (x) at an input (105) and output signals of the at least one feedback loop filters (130,135).