Patent application number | Description | Published |
20090088093 | Signal predistortion in radio transmitter - A transmission signal to be transmitted from a radio transmitter is predistorted in order to compensate for the signal distortion caused by a power amplifier. The predistortion parameters for at least one of envelope and phase predistortion are selected according to the bandwidth of the transmission signal. Then, the transmission signal is predistorted with the selected predistortion parameters, and the predistorted transmission signal is power-amplified in the power amplifier for transmission | 04-02-2009 |
20090161793 | Processing transmission signals in radio transmitter - A method, apparatus, and computer program is presented for use in a radio transmitter using a polar transmitter structure in which a transmission signal is separated into an amplitude component and a phase component. The transmission signal includes transmission symbols distributed to a number of transmission resource blocks allocated to the radio transmitter for transmission. The amplitude component of the transmission signal is low-pass filtered in a low-pass filter configured by filtering parameters selected according to the number of transmission resource blocks allocated to the radio transmitter. Then, the low-pass filtered amplitude component is used in power supply of a power amplifier configured to power-amplify a phase component of the transmission signal. | 06-25-2009 |
20090192738 | CALIBRATION TECHNIQUE FOR POWER AMPLIFIERS - A method of calibrating an amplifier includes receiving input and output samples, wherein the input and output samples are time-aligned, assigning at least one of the input and output samples to one of a plurality of categories based on the input sample, and estimating at least one characteristic of the amplifier based on the contents of at least one of said plurality of categories. | 07-30-2009 |
20090267581 | Hybrid switched mode/linear mode power amplifier control - In one aspect of the exemplary embodiments of this invention a method includes determining, based at least in part on a number of resource blocks to be transmitted, where the resource blocks may be spectrally contiguous or spectrally non-contiguous, a ratio of power to be provided by a switched mode power supply to power to be provided by a linear mode power supply; controlling the switched mode power supply and the linear mode power supply in accordance with the determined ratio to supply a total amount of power and providing the total amount of power to a supply voltage input of a polar transmitter. | 10-29-2009 |
20100052781 | Correcting distortions at output of power amplifier - A solution is provided for correcting distortions on a radio frequency output signal of a power amplifier. There is provided an apparatus, comprising: a processor configured to determine at least one correction factor for a distortion on a radio frequency output signal of a power amplifier on the basis of estimated characteristics of a distorted time-varying supply voltage from a power supply to a power amplifier and an interface configured to feed the at least one correction factor to an input signal of the power amplifier. | 03-04-2010 |
20100060358 | Compensating for variations in the response of a power supply - Apparatus includes an equalizer having a signal input, a control input and an output; a controllable power supply having a control input and an output, the input of the controllable power supply being coupled to the output of the equalizer; a power amplifier having a main signal input, a power supply input, and an output, the power supply input being coupled to the output of the controllable power supply; and a controller having first and second inputs and an output, the first input being coupled directly or indirectly to the output of the controllable power supply, the second input being coupled to a node upstream of the equalizer, and the output being coupled to the control input of the equalizer; the equalizer being configured to apply equalisation to an envelope signal received at its input and to provide a resulting equalized envelope signal at its output, the controllable power supply being configured to provide a power signal at its output based on the equalized envelope signal received at its input, the power amplifier being configured to utilize power received at its power supply input to provide on its output a modulated transmission signal representative of a signal received at the main signal input, and the controller being configured to compare input signals received at its first input to signals received at its second input, and to utilize the results of the comparison to configure the equalizer to correct for variations in the response of the controllable power supply at different frequencies. | 03-11-2010 |
20100079321 | Analogue-To-Digital Converter (ADC) Dynamic Range And Gain Control - The present invention relates to a method for using the peak-to-average power ratio (PAR) of signals received by a receiver to control the gain of the receiver for an analogue-to-digital converter (ADC) and/or to control the dynamic range of the ADC. | 04-01-2010 |
20100157910 | Radio resource sharing - An apparatus includes a controller configured to be coupled with a radio interface of a first wireless network node. The controller is further configured to respond to a spectrum emission mask that includes indications of both desirable emissions and undesirable emissions over a plurality of radio resource allocation units and to estimate a signal to noise ratio in individual ones of radio resource allocation units at at least one second node, to select an appropriate modulation-and-coding scheme per radio resource allocation unit and to schedule transmissions for the radio interface on the radio resource allocation units using the selected modulation-and-coding scheme. The controller is further configured to receive via the radio interface a beacon transmission from a second node, where the beacon transmission indicates a receiver sensitivity of the second node. The controller estimates a path loss to the second node that transmitted the beacon in accordance with knowledge of a transmission power with which the beacon was transmitted and considers distortion characteristics associated with the radio interface, the estimated path loss and the estimated signal to noise ratio so as to allocate transmit signal energy such that a sum of the desirable emissions and the undesirable emissions is less than limits imposed by the spectrum emission mask. | 06-24-2010 |
20100323622 | INTERFERENCE CANCELLATION FOR PREDICTIVE SIGNALS - A method, apparatus, system, and computer program product example embodiments of the invention are disclosed to reduce interference of predictive signal transmissions between wireless devices. In an example embodiment, a wireless receiver is configured to receive a composite signal, wherein the composite signal includes at least a beacon component comprising a regular beacon symbol. The wireless receiver is configured to determine from the beacon component, a predicted reception of a predicted future beacon symbol, using a known beacon transmission pattern. The wireless receiver is configured to cancel from the composite signal a future received beacon symbol, based at least partly on the predicted future beacon symbol. | 12-23-2010 |
20110080877 | Variable single carrier frequency division multiple access (SC-FDMA) coding - A method can include applying a first modulation and coding scheme to a first part of a symbol, applying a second modulation and coding scheme to a second part of the symbol, and combining the first part of the symbol and the second part of the symbol to form the symbol to be transmitted. The first modulation and coding scheme differs from the second modulation and coding scheme and wherein the first part of the symbol is temporally different from the second part of the symbol. | 04-07-2011 |
20110086599 | TRANSMITTER CONTROL - Various embodiments are disclosed relating to techniques of controlling a transmitter. In accordance with an example embodiment of the present invention, a maximum level of signal distortion acceptable for a transmission from a transmitter may be determined based on information of operating characteristics of the transmitter and/or the environment in which the transmission is to be made. | 04-14-2011 |
20110096703 | METHOD AND APPARATUS FOR FLEXIBLE SPECTRUM USAGE IN COMMUNICATIONS SYSTEMS - Methods and apparatuses are disclosed that provide flexible use of a shared radio resource. An apparatus determines from monitoring signal energy on a shared radio resource whether other transmitters are present. A predetermined set of time division duplex (TDD) signaling patterns are identified. A correlation is performed between signal energy received on the shared radio resource and the predetermined TDD signaling patterns. The apparatus may then determine a TDD signaling pattern that may reduce or avoid interference with any other transmitters using the shared resource. The shared radio resource may be, for example, a shared frequency spectrum. Efficient allocation of radio resources among apparatuses such as radio transceivers, without fixed time references or predetermined patterns, may be obtained. The radio transceivers may be base stations or mobile user equipment in a wireless communications system. The apparatus may be an integrated circuit, a portion thereof, or chipset. | 04-28-2011 |
20110111710 | Methods and Apparatuses for Frequency Filtering for Non-Centered Component Carrier Transmission - In accordance with an example embodiment of the present invention, an apparatus comprises a first multiplier configured to convert a first frequency signal into a second frequency signal based at least in part on a first complex-valued local oscillator signal, a pair of low-pass filters configured to filter the second frequency signal, and a second multiplier configured to convert the filtered second frequency signal into a third frequency signal based at least in part on a second complex-valued local oscillator signal wherein the first frequency signal and the third frequency signal share the same frequency position and the pair of low-pass filters is configured based on an indication of allocated transmitted channels. | 05-12-2011 |
20110116532 | METHOD AND APPARATUS FOR LATENCY-AWARE SCHEDULING USING INTERFERENCE CANCELLATION - In accordance with an example embodiment of the present invention, there is provided an apparatus comprising transceiver circuitry configured to obtain a data unit received over an air interface, the air interface comprising first and second radio resources, logic circuitry configured to determine whether the data unit was received over the first radio resources or the second radio resources and responsive to a determination that the data unit was received over the first radio resources, process the data unit without interference cancellation and responsive to a determination that the data unit was received over the second radio resources, process the data unit using interference cancellation. | 05-19-2011 |
20110228837 | Methods and Apparatuses for Interference Cancellation with Frequency Error Compensation for Equalizer Adaptation - In accordance with an example embodiment of the present invention, a method comprises receiving a input signal comprising an interfering signal component and a desired signal component at a wireless device; estimating a frequency error of the interfering signal component; and frequency-shifting the input signal based at least in part on the estimated frequency error. The method also comprises estimating a frequency response based on the frequency-shifted input signal and a reconstructed first cancellation signal; obtaining a second cancellation signal by applying the estimated frequency response to the first cancelation signal; subtracting the second cancellation signal from the input signal; and decoding the desired signal component from the input signal after the second cancellation signal is subtracted from the input signal. | 09-22-2011 |
20110274016 | UNSYNCHRONIZED SIGNALING IN RADIO SYSTEMS USING FREQUENCY DOMAIN PROCESSING - A method for unsynchronized signaling between nodes in a network is described. The method includes partitioning a message for asynchronous transmission in a network into a plurality of symbols. A symbol includes a cyclic prefix. Causing the plurality of symbols to be transmitted (for example, via a transmitter) on one or more subcarriers allocated for asynchronous transmissions is also included in the method. A given symbol is transmitted so as to reduce a discontinuity between a previous symbol and the given symbol. The method may also include applying a phase shift to one or more symbols of the plurality of symbols. Transmitting may include transmitting at a transmission frequency, where a length of a transmission cycle is determined by the transmission frequency, and where a length of the cyclic prefix is equal to an integer number of transmission cycles. Apparatus and computer readable media are also described. | 11-10-2011 |
20120164950 | Cognitive Radio Transmission - A method, an apparatus, and a computer program for performing cognitive communications in a radio environment are presented. First, a radio communication device estimates a time-varying interference environment in a radio communication channel. On the basis of the estimation, a future interference environment is predicted from time-varying characteristics of the estimated interference. Upon predicting the future interference environment, a radio transmitter is configured to apply transmission parameters to be used in a future transmission time instant for which the interference environment has been predicted. As a consequence, the transmission parameters are selected proactively to match with the predicted interference environment. The transmission parameters may be configured as time-variant. | 06-28-2012 |
20120166119 | Apparatus and Method for Reducing Discontinuities Between Waveforms in a Communication System - An apparatus, method and system for reducing discontinuities between waveforms in a communication system. In one embodiment, an apparatus includes a processor and memory including computer program code. The memory and the computer program code are configured, with the processor, to determine an amplitude and set of derivatives at an end point of a first symbol waveform, and determine an amplitude and set of derivatives at a beginning point of a second symbol waveform. The memory and the computer program code are configured, with the processor, to insert a guard period waveform having an amplitude and set of derivatives at a first end to substantially match the amplitude and set of derivatives at the end point of the first symbol waveform and an amplitude and set of derivatives at a second end that substantially matches the amplitude and set of derivatives at the beginning point of the second symbol waveform. | 06-28-2012 |
20120257667 | Methods And Apparatus For Weighted Equalization - Systems and techniques for equalization of a response of a receiver. In one embodiment, a response of a device to a known signal is measured to generate a measured signal. A processor is operated to apply an initial weighting to the measured signal and the known signal. The processor is operated to iteratively perform the operations of constructing an equalizer based on the weighted signals, testing the performance of the equalizer on the measured signal, and adjusting weighting applied to the measured signal and the known signal, until the performance of the equalizer on the measured signal meets a predetermined criterion. | 10-11-2012 |
20120287879 | DETERMINING "FAIR SHARE" OF RADIO RESOURCES IN RADIO ACCESS SYSTEM WITH CONTENTION-BASED SPECTRUM SHARING - A method, apparatus, system, and computer program product example embodiments of the invention are disclosed to structure access to a wireless medium to reduce interference between nearby nodes. In example embodiments of the invention, a method includes the steps of determining an amount of available wireless communication resources in a reception area; determining a number of wireless communication nodes in the reception area; generating a reservation limit of the available wireless resources; determining an inability to allocate the reservation limit of the available wireless resources; transmitting a request for release of resources to at least one other wireless communication node. Another node receiving the request, performs a method including the steps of determining a threshold; comparing an allocated amount of wireless communication resources against the threshold; and releasing at least a part of the allocated amount of resources, if the reserved number is greater than the threshold. | 11-15-2012 |
20120309442 | METHOD AND APPARATUS FOR SPECTRUM SENSING - In a non-limiting and exemplary embodiment, a method is provided for adapting a device set of one or more radio devices providing detection estimates for the presence of a primary radio resource user. A first detection estimate for the presence of the user is determined on the basis of spectrum sensing. At least one other detection estimate for the presence of the user is received from the device set. A detection value is generated on the basis of the first detection estimate and the at least one other detection estimate, and the device set is adapted on the basis of the detection value. | 12-06-2012 |
20130016761 | Transmitter with a Variable Sampling RateAANM NENTWIG; MarkusAACI HelsinkiAACO FIAAGP NENTWIG; Markus Helsinki FI - The present invention presents a method and a system for mitigating effects of clock harmonics in the receiver. The receiving signal may be monitored in such a way that the interfering harmonic component is tracked. When the interfering frequency is found out, the system determines the clock or clocks in the transceiver which are contributing to the interfering spurious tone. After that, the contributing clock(s) frequency is selected so that the effect of the spurious tone in the receiving passband is minimized or mitigated. This is performed by selecting a suitable clock frequency resulting in the spurious tones all falling outside the receiver passband; or in an OFDM system, by choosing a clock frequency deriving the spurious tone straight onto a subcarrier signal frequency. | 01-17-2013 |
20130058288 | Apparatus and Method to Allocated Communication Resources in a Communication System - An apparatus, system and method for providing interference cancellation and communication resource reservation limits to allocate communication resources in a communication system. In one embodiment, the apparatus includes a processor ( | 03-07-2013 |
20130059543 | SENSING IN A COMMUNICATION SYSTEM - Usefulness of resource usage sensing information is determined by at least one node in a radio system. Transmission of sensing result information in the radio system is then controlled based at least in part on the determined usefulness. | 03-07-2013 |
20130070815 | ADC Clock Selection Based on Determined Maximum Conversion Rate - The present invention introduces a method, an apparatus and a computer program product for mitigating effects of alias responses in a transceiver, by selecting a clock rate for an analog-to-digital converter based on a determined maximum conversion rate of the ADC. The selected conversion rate places an alias response of the unwanted signal component to a frequency range which is substantially non-overlapping with a wanted signal component of the receiver. Furthermore, a temperature of the transceiver may be measured e.g. by a temperature compensation unit of a reference oscillator. Furthermore, a data table may be used by a processing unit for linking temperatures with maximum conversion rates of the analog-to-digital converter. The method is implemented in the processing unit of the transceiver which is further configured to execute the operations of the corresponding computer program product according to the invention. | 03-21-2013 |
20130070818 | RECEIVER - A method, apparatus and computer program product for a method of operating an analog-to-digital converter of a transceiver which includes a transmitter and a receiver, the receiver including the analog-to-digital converter. The method includes determining a maximum conversion rate of the analog-to-digital converter, wherein the determining step includes determining a temperature of the analog-to-digital converter, and selecting a conversion rate of the analog-to-digital converter, based on the determined maximum conversion rate and a frequency of an unwanted signal component of the receiver, such that the selected conversion rate places an alias response of the unwanted signal component to a frequency range which is substantially non-overlapping with a wanted signal component of the receiver. | 03-21-2013 |
20130114662 | METHOD AND APPARATUS FOR RADIO RECEIVER EQUALIZATION - A method, apparatus and computer program product are configured to provide calibration accuracy in an analog filter. In this regard, a method is provided that includes estimating a cutoff frequency for an analog filter. The method further includes causing a filter tuning word to be modified based on the estimated cutoff frequency for the analog filter. The method also includes determining a residual cutoff frequency mismatch for the analog filter. The method also includes causing an equalizer configuration to be selected for a digital filter based on the determined residual cutoff frequency mismatch. | 05-09-2013 |
20130142177 | METHOD AND APPARATUS FOR ADJACENT-CHANNEL EMISSION LIMIT DEPENDING ON SYNCHRONIZATION OF INTERFERED RECEIVER - In accordance with an example embodiment of the present invention, an apparatus comprises a transceiver configured to receive a transmission from a radio node, the transmission including a synchronization signal; a processor configured to determine a state of synchronization with the radio node and based at least in part on the state of synchronization adjusting at least one transmission parameter. | 06-06-2013 |
20130182600 | INTERFERENCE-AWARE SCHEDULING WITH BROADCAST/MULTICAST SIGNALING - A method for interference-aware scheduling is provided. The method can include acquiring a plurality of interference characteristics, each of the interference characteristics associated with a range of communication resources. The method may further include combining at least two of the interference characteristics into a combined interference characteristic, and transmitting a message encoding the combined interference characteristic. | 07-18-2013 |
20130201967 | Open/Closed Loop Synchronization for Radio Transmitters - Methods and systems can provide accurate synchronization of two nodes even when those nodes cannot communicate directly with one another. A method, for example, can include determining a first propagation delay estimate to a first node ( | 08-08-2013 |
20130225221 | Method and Apparatus for Transfer of Radio Resource Allocation - In accordance with an example embodiment of the present invention, an apparatus comprising a transmitter configured to transmit a message releasing radio resource, a receiver configured to receive one or more requests for acquisition of at least part of the released radio resource and a controller configured to defer grant of any request for radio resource acquisition if more than a predetermined number of requests is received within a predetermined time window. | 08-29-2013 |
20130260809 | METHOD AND APPARATUS FOR ADJACENT CHANNEL EMISSION LIMIT - In accordance with an example embodiment of the present invention, an apparatus comprises a transceiver configured to receive a transmission signal from a radio node; a processor configured to, based on the received transmission signal, determine membership of the apparatus and the radio node in a common synchronization group and based at least in part on the determination, adjusting at least one transmission parameter. | 10-03-2013 |
20130281143 | METHOD AND APPARATUS FOR INTERFERENCE-AWARE WIRELESS COMMUNICATIONS - In accordance with an example embodiment of the present invention, a method comprises receiving at a controlling node an interference measurement report from a first node; determining from a transmission schedule a transmit activity by a second node during an interference measurement period associated with the interference measurement report; estimating a contributing interference from the transmit activity by the second node during the measurement period; and causing an adjustment to the contributing interference. | 10-24-2013 |
20130288737 | APPARATUS AND METHOD TO MANAGE INTERFERENCE BETWEEN COMMUNICATION NODES - An apparatus, method and system to control a transmitter power level to manage interference between communication nodes in a communication system. In one embodiment, an apparatus includes a processor and memory including computer program code. The memory and the computer program code are configured to, with the processor, cause the apparatus to receive an interference message including a reported interference characteristic associated with a communication resource employed by an interfered communication node and a reported weighting factor indicating an importance of the communication resource to the interfered communication node. The memory and the computer program code are also configured to, with the processor, cause the apparatus to generate a message for a receiving communication node employing the communication resource, and select a transmitter power level for the message as a function of the reported interference characteristic and the reported weighting factor. | 10-31-2013 |
20140049416 | Analogue to Digital Converter - Measures are provided for performing direct radio-frequency to digital conversion. A radio-frequency input signal is compared with a plurality of reference voltages to generate a plurality of comparison signals, each comparison signal corresponding to one of the plurality of reference voltages. One or more of the plurality of generated comparison signals are first filtered to generate a first filtered signal. One or more of the plurality of generated comparison signals are second filtered to generate a second filtered signal. A digital output signal is generated at least on the basis of the first filtered signal and the second filtered signal. | 02-20-2014 |
20140106690 | Interference Reduction - Measures for interference reduction for an envelope branch type transmitter. Such measures may include determination of a target frequency span for reducing interference caused by an envelope branch type transmitter, and configuration of a differential delay between a signal branch and an envelope branch of the envelope branch type transmitter on the basis of the determined target frequency span. | 04-17-2014 |
20140113576 | Method and Apparatus for Signal Reception - A preferred embodiment of the present invention relates generally to enhancing quality of a received signal in a receiver. The received signal can be enhanced by reducing phase noise. A described method starts with determining input information, wherein the input information comprises at least one of the following pieces of information: a modulation-and-coding scheme of the received signal, a multiple-antenna configuration (MIMO configuration), a signal quality estimate of the received signal, or a frequency separation between the received signal and a transmitted signal. The method continues with selecting a bandwidth value on the basis of the input information. The selecting should result in such a bandwidth value which has an advantageous effect to the quality of the received signal. This advantageous effect is achieved by performing the following: using the bandwidth value for generating a local oscillator signal, and shaping the received signal with the local oscillator signal. | 04-24-2014 |
20140192718 | Wireless Communication - Communication apparatus, method and computer program product for communication in a communication system. While a transmitter of a transceiver module of a user equipment is transmitting, a first receiver is operated on a first received signal, and a second receiver is operated on a transmitted signal from the transmitter. While the transmitter is not transmitting, the second receiver is operated on a second received signal. | 07-10-2014 |
20140362788 | Receiver Configuration - Measures, including methods, apparatus and computer software for use in a cellular telecommunications network. A network entity causes transmittal, to a user equipment comprising a receiver currently configured in a relatively low performance reception modulation state, of signaling information associated with configuration of the receiver in a relatively high performance reception modulation state and, in response to transmittal of the signaling information, the network entity receives from the user equipment an indication that downlink reception by the receiver configured in the relatively high performance reception modulation state is currently viable. | 12-11-2014 |
20150063196 | Apparatus and Method To Allocate Communication Resources In A Communication System - An apparatus, system and method for providing interference cancellation and communication resource reservation limits to allocate communication resources in a communication system. In one embodiment, the apparatus includes a processor and memory including computer program code. The memory and the computer program code are configured, with the processor, to cause the apparatus to identify an interval of received signal power levels for interference cancellation of an interfering signal to a primary signal, and generate a message that provides the interval of received signal power levels for the interference cancellation of the interfering signal to the primary signal. In a related embodiment, the memory and the computer program code are configured, with the processor, to cause the apparatus to determine a communication resource reservation limit, and request an increase in the communication resource reservation limit. | 03-05-2015 |