Telefonaktiebolaget Lm Ericsson (publ)

Optis Cellular Technology, LLC

Vimar Björk

Jacob Österling

Derek Hagen

Claes Rolen

Daniel Chen Larsson

Lars Sundström

Johan Axnäs

Mikael Coldrey

Jonas B Karlsson

Ulf Gustavsson

Leonard Rexberg

Peter Jakobsson

Markus Ringström

Sven Jacobsson

Alireza Nejatian

Johan Thorebäck

Tore André

Scott Leyonhjelm

Jichang Liao

Christian Braun

Giuseppe Durisi

Erik Hammarberg

Georgios Sidiropoulos

Karl-Erik Assarsson

Torbjorn Gunnar Widhe

Thord Hyllander

Claes Rolén

Torbjörn Gunnar Widhe

John Grass

Lennart Neovius

Paul Leather

John Gass

Lennar Neovius

A transmission beam change method is disclosed for a wireless communication transmitter adapted to transmit an orthogonal frequency division multiplex (OFDM) signal using a transmission beam of a plurality of transmission beams available at the wireless communication transmitter. The method includes temporarily adapting an output power during a transmission beam change from one transmission beam to another transmission beam. In some embodiments, the transmission beam change is performed during a cyclic prefix (CP) of an OFDM symbol and the temporary adaptation is applied to only a part of the CP. Temporarily adapting the output power includes decreasing the output power to initiate the temporary adaptation and increasing the output power to terminate the temporary adaptation. In some embodiments, the temporary adaptation is performed during all transmission beam changes or only when an occurrence frequency of transmission beam changes is higher than a threshold value.

Power scaling of transmission signal during transmission beam change

In a method for calibrating at least two cross coupled antenna element groups in an antenna array, calibrating (S) the antenna elements within each group of antenna elements. Further, in a respective calibration transceiver in each group, measuring (S) a coupled signal within each group and a cross-coupled signal originating in another of the at least two groups. In addition, determining (S) a respective relative phase and amplitude difference between said at least two groups based on the measured coupled signal and said cross-coupled signal, and determining (S) the true phase and amplitude difference between the at least two groups based on the determined respective relative phase and amplitude differences. Finally, calibrating (S) the at least two antenna groups based on the determined true phase and amplitude difference.

Method and arrangement for antenna calibration

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 () a type of interference scenario affecting the received signal and obtains () 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 () for the received signal, which AGC mode out of the following ACG modes to be used: &#x2014;a slow AGC using a release timer for releasing an AGC state, &#x2014;a fast AGC using a release timer for releasing an AGC state, and&#x2014;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.

Radio network node and method therein for deciding AGC mode for a received signal in a wireless communications network

It is provided a provided a time-interleaved analog-to-digital converter (ADC) system comprising an input port configured to receive an analog signal, an ADC-array comprising M, M&#x2265;2, ADCs arranged in parallel. Each ADC is configured to receive and to convert a portion of the analog signal into a digital signal at a sample rate f. The ADC-system further comprises a reference ADC configured to receive and to convert the analog signal into a digital reference signal at an average sampling rate flower than f. Each sampling instant of the reference ADC corresponds to a sampling instant of an ADC in the array of ADCs, and the ADC to select for each reference ADC sampling instant is randomized over time. The ADC-system also comprises a correction module configured to adjust the digital signal outputs of the ADC-array into a corrected digital output signal based on samples of the digital reference signal and the digital signals from the corresponding selected ADCs. It is also provided a method for time-interleaved analog-to-digital conversion.

Time-interleaved analog-to-digital converter system

The present disclosure relates to a wireless communication node comprising at least one array antenna configured to receive a radio signal, said array antenna comprising a plurality of receiving antenna devices, each of said antenna devices being connected to a respective receiving circuit which is configured for processing said radio signal. Each receiving circuit comprises a demodulator, an analog-to-digital converter and a decoder, the demodulator being configured to receive an analog signal from the corresponding receiving antenna device and to output a demodulated analog signal to said analog-to-digital converter which outputs a converted digital signal to the decoder. Furthermore, the node is configured for adding a direct current, DC, offset value to said demodulated analog signal wherein the combined offset values of said node follow a predetermined distribution of values, having a variance, over the analog-to-digital converters.

Wireless communication node and a method for processing a signal in said node

An aspect of the solution herein is directed to a receiver arrangement () including multiple RF-filters (RF, RF, RF) and RF-attenuators (RF-A, RF-A, RF-A), one for each of multiple frequency bands (RX, RX, RX), where each RF-attenuator (RF-A, RF-A, RF-A) is provided with a respective power splitter (PS, PS, PS) that connects the RF-attenuator to an average power detector (Pave), which is configured to monitor an average power of each frequency band, where all frequency bands share a common antenna arrangement (), at least one common LNA () and a common mixer arrangement () configured to mix all frequency bands into a common analog signal, and where a peak power monitor arrangement () is configured to monitor the peak power of the common analog signal, wherein, the receiver arrangement includes a digitizer arrangement () configured to control the gain of each RF-attenuator based on the monitored average power of each band from the average power detector and a detected peak power of the common analog signal from the peak power monitor arrangement.

Receiver arrangement and a method therein

The invention discloses a base station () for a cell () in a cellular communications system (). The base station comprises a scheduler () for scheduling transmissions to users () in the cell () and a transmitter with a power amplifier (). The scheduler () is also arranged to set the output power level of the power amplifier () for an upcoming transmission period.

Base station and method for scheduler controlled setting of the output power of a base station power amplifier

The invention provides a receiver comprising an input end, an Rx-chain with at least one regulating means and an output end. The receiver further comprises a feedback loop in the Rx-chain, the regulating means arranged for providing a higher or lower gain setting. The feedback loop comprises an AGC Multilevel threshold detector unit, AMU. The AMU comprises at least one Low Multilevel Threshold Detector, LMTD, and the LMTD comprises at least two threshold detectors, each detector having an associated low threshold level and detection interval, the length of the detection interval being shorter the lower the low threshold level is arranged to be set. The higher gain setting being arranged to be initiated through the feedback loop when the absolute level of an AGC input signal has been below at least one of the low threshold levels during the entire detection interval associated with that low threshold level. The invention also provides a communication system comprising the receiver, an AGC Multilevel threshold detector Unit (AMU) and a method to adjust the gain in a receiver.

AGC low threshold signal level detection

A receiver circuit comprising first and second receivers for demodulating first and second parts, respectively, of a received signal. The receiver circuit also comprises an adjustment circuit for adjusting the demodulated signal from the first receiver. The output signal from the adjustment circuit is used as output signal from the receiver circuit which also comprises an adjustment value circuit for determining an adjustment value for the adjustment circuit in adjusting the output signal from the first receiver. The adjustment value circuit receives the demodulated signal from the second receiver and the output signal from the adjustment circuit and uses differences between these input signals for forming said adjustment value. The first receiver and the second receiver have different transfer functions within one and the same frequency range.

Receiver system comprising a main receiver and au auxiliary receiver for correcting imperfections in the main receiver

A communication method for use in a first cellular communications system is proposed for minimizing the interference caused by strong interfering pulses in the same frequency band as the system or an adjacent frequency band. The method comprises the steps of Receiving an incoming signal Bandpass filtering the incoming signal to filter out a first frequency band (B) used by the communications system and forwarding the bandpass filtered signal to a receiver unit () for processing and forwarding the processed signal to a signal detector () arranged to detect the wanted signal. Redirecting a fraction of the received signal and detecting the power of the redirected fraction. Using the detected power to modify the function of the signal detector ().

Communications unit and method for detecting pulse interference

The present solution relates to a method in a first communication node () for suppressing noise in a communication system () utilizing an automatic gain control. The first communication node () receives () a signal from a second communication node (). Then, the first communication node () determines () if a gain level is changed. The signal gain is changed (). The next step is for the first communication node () to determine () if an inband interferer is present, and then to suppress () transient noise in the signal.

Reducing switching noise

The present invention relates to a method, an Automatic Gain Control control unit and a receiver for Noise change output signalling. It also relates to an Adjustment Unit, a receiver and a base band detector for adjustment of an Automatic Gain Control output signal on the basis of the Noise change output signalling. In a first step a receiver receives a communication input signal. In a second step at least one Automatic Gain Control attenuator or amplifier in the receiver attenuates the communication input signal. In a third step the receiver produces at least one AGC output signal. In a fourth step at least one AGC control unit in the receiver initiates a changed gain setting on the receiver, when the level of an AGC control unit input signal received by the unit has been below a first threshold level or above a second threshold level during a detection interval.

WCDMA AGC receiver SNR adjustment and signalling

A method and base station for forming an OFDM signal from a baseband signal includes a partitioning unit configured to partition a block of baseband signal samples into sub-blocks. A sub-carrier mapper maps the sub-blocks onto adjacent sub-carrier blocks of an OFDM multi-carrier to form corresponding unprefixed OFDM symbols. A cyclic prefix adder adds a cyclic prefix to each mapped sub-block to form prefixed OFDM symbols. Phase compensations force the unprefixed OFDM symbol part of all subsequently up-converted prefixed OFDM symbols to start at the same phase. Up-converters up-convert the phase compensated prefixed OFDM symbols to respective radio frequency bands having center frequencies and bandwidths that preserve the OFDM multi-carrier structure. A combiner combines the up-converted phase compensated prefixed OFDM symbols into an OFDM signal.

Method and base station for orthogonal frequency division multiplexing (OFDM) signal processing

The present invention relates to radio base stations including a standardized interface CPRI between a Radio Equipment (RE) and a Radio Equipment Controller (REC). The present invention also relates to a method. The problem addressed is how to convey calibration information from the RE to the REC, when the capacity is occupied by radio IQ samples. The solution is to suppress the IQ samples to get capacity for the calibration information. Various embodiments of the invention focus on reducing the negative impact the suppression of IQ data may have on detecting the signals received.

Method and a radio base station in a telecommunications system

The invention provides robust and non-invasive calibration of an adaptive signal conditioning system having a signal conditioning block in the signal path to a signal conversion system, and a feedback path with a number of feedback components for enabling adaptation, by means of a parameter adaptation block, of the parameters used in the signal conditioning. In order to calibrate the feedback path, a well-defined reference signal is inserted into the feedback path, and an appropriate calibration coefficient is then determined by a coefficient calibrator in response to the received reference signal. The calibration coefficient is provided to a compensator, which effectively compensates for changes in the transfer characteristics of the feedback path due to factors such as variations in ambient temperature and component aging. Accordingly, the feedback signal transferred over the calibrated feedback path will be an accurate representation of the output signal of the signal conversion system, thus allowing accurate adaptive signal conditioning.

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Göteborg, Sweden

Vimar Björk