Abstract: A method and apparatus for controlling the power consumption of a receiver based on current operating conditions is described herein. A receiver according to the present invention applies a received signal to a variable filter. The received signal includes a desired in-band signal. Depending on the current operating conditions, the received signal may further include one or more unwanted out-of-band blocking signals. A filter controller controls one or more operating parameters of the variable filter to maintain the power ratio at the filter output of the power of the blocking signal(s) to the in-band signal at or below a desired level. In so doing, the present invention controls the receiver power consumption while still providing the desired receiver performance.

Abstract: A method for a single radio aggregated spectrum receiver of a terminal arranged to operate in a radio network is disclosed. The method comprises receiving information from a network node of the radio network about frequency properties of an aggregated spectrum to be received; determining information about the aggregated spectrum comprising at least one of presence of blocking interferer(s) interspersed with, and pass bands within the aggregated spectrum; and providing filter(s) based on the determined information about the aggregated spectrum such that desired signals are passed and any blocking interferer(s) are attenuated. Corresponding computer program, receiver and terminal are also disclosed.

Abstract: A radio-receiver circuit having an analog-to-digital conversion unit. The analog-to-digital conversion unit comprises an analog-to-digital converter (ADC) and a filter operatively connected to an input terminal of the ADC in a receive path of the radio-receiver circuit. The radio-receiver circuit further comprises a control unit adapted to receive control data and determine, based on the control data, a frequency band in which data is to be transmitted to the radio-receiver circuit during a subsequent time interval. Furthermore, the control unit is operative to adapt at least one frequency characteristic of the analog-to-digital conversion unit to the determined frequency band for receiving said data transmitted in said subsequent time interval.

Abstract: This invention relates to adjusting a filter of a time-continuous Sigma-Delta converter arranged to convert an analog input signal (Sin) to a digital output signal. A control signal indicative of a gain of the filter is provided, and the gain of the filter is adjusted in dependence of the control signal. The control signal is provided from the digital output signal of the Sigma-Delta converter. In this way the performance of the Sigma-Delta converter can be improved in a simple way that requires no or few additional analog components, and the Sigma-Delta converter itself is used to adjust its performance. Using a signal from the digital domain of the Sigma-Delta converter is advantageous in that it is typically easier, faster and more precise to process signals in the digital domain.

Abstract: Teachings herein schedule a data transmission in a variable bandwidth wireless communication system based on the power efficiency of a mobile node. One or more processing circuits, of the mobile node or a network node, determine the value of a control setting that defines a power efficiency configuration of the mobile node. In one embodiment, for example, the power efficiency configuration indicates the mobile node is configured to operate at the maximum power efficiency attainable without the data rate of the data transmission falling below a minimum data rate required by a quality of service. Regardless, the one or more processing circuits select from different possible bandwidths of the data transmission a bandwidth that supports a given data rate and that, according to a power efficiency model that models power efficiency of the mobile node for the different possible bandwidths, yields a power efficiency comporting with the power efficiency configuration.

Abstract: A level of power reduction for a transmitter arranged to transmit signals modulated according to one of a number of modulation configurations via radio channels in a digital wireless communications system is estimated. Modulation dependent data comprising a term calculated from a third order product of a signal modulated according to a modulation configuration are provided, and a power reduction estimate for transmission of signals modulated according to said modulation configuration is calculated there from. The modulation dependent data are provided to comprise, in addition to the term calculated from a third order product, at least one term calculated from a higher order product. Further, transmitter dependent data are provided, and the estimate is calculated from said modulation dependent and transmitter dependent data. Thus a more accurate method of determining a power reduction is achieved, which also allows different operating conditions for the transmitter to be considered.

Abstract: The invention relates to adjusting an input signal level of a Sigma-Delta converter. A control signal indicative of an input signal level to said Sigma-Delta converter is generated, and the input signal level to said Sigma-Delta converter is adjusted in dependence of said control signal. The control signal is generated as a signal indicating an operating condition of said Sigma-Delta converter. In this way, internal signals from the Sigma-Delta converter can be used to determine the state of the Sigma-Delta converter, i.e. whether it is operating within its operational input range or not, and whether it is close to the limits of the operational input range. This provides a simple, but accurate guidance of an automatic gain control upstream of the Sigma-Delta converter.

Abstract: Efficient carrier aggregation is enabled in a receiver employing a single frequency source, and dividing the frequency source by different frequency dividing factors to generate two or more RF LO frequencies. Received signals are down-converted to intermediate frequencies by mixing with the respective RF LO frequencies. By utilizing only a single high frequency source, embodiments of the present invention avoid spurious and injection locking issues that arise when integrating two or more frequency sources, and additionally reduce power consumption as compared to a multiple frequency source solution.

Abstract: A user equipment (UE) in a communication system can keep track of the cell/frequency deployment of a network operator preferred by the user, and based on the tracked information, the UE can build up its own user-specific Neighbor Cell List. When the UE is roaming, the UE does received-signal measurements according to cells and carrier frequencies identified in the broadcast Neighbor Cell Lists of the roamed-into network, but the UE also does received-signal measurements (with higher priority) according to the user-specific Neighbor Cell List that it has built up. Accordingly, a UE implementing a user-specific Neighbor Cell List analyzes its radio environment based on received signals and stores information about that environment, including user-preference information that prioritizes cells in the radio environment. The UE can then carry out cell search based on the stored environment and user-preference information.

Abstract: A polar modulation transmitter offers a split architecture for determining amplitude modulation path delay of the transmitter and comprises a split supply modulation circuit and a split power amplifier circuit. The split supply modulation circuit includes a common supply input and is configured to receive a common amplitude-modulation signal at respective signal inputs and output first and second modulated supply signals responsive to the common amplitude-modulation signal.

Abstract: Coupler-based amplifiers provide a measure of load mismatch based on the difference between the two output signal amplitudes from the amplifiers. This measure can be used to control variable matching networks (VMNs) or amplifier supply voltages to maintain constant distortion levels and high power transfer/efficiency and even to control output power. Load mismatch is measured by comparing the amplifier device output amplitudes and adjusting the circuit based on the comparison to counteract undesired behavior, such as increasing distortion levels.

Abstract: An amplifier configuration and method of amplifying a signal are provided for automatic optimization of linearity of power amplifier input/output characteristics. The amplifier configuration utilizes a feedback loop that includes detecting envelopes of signals that are input and output from a power amplifier. The amplifier configuration includes an offset parameter determined in a second feedback loop that adapts to values for optimizing the linearity of the power amplifier output when input signal amplitudes are within a predetermined range of small signal values, thereby producing a substantially reduced distortion and thus linearized output over the entire input signal amplitude range.