Nokia Solutions and Networks Oy

Jan Hellmann

Marko Fleischer

Rene Röschke

Michael Kronwald

Bjoern Jelonnek

Björn Jelonnek

Christian Reichl

Michael Weber

Helmut Heinz

Thomas Klink

Norbert Hueller

Jürgen Hellstab

Eric Koenig

The present subject matter relates to an apparatus for a communication system. The apparatus is configured for: for each beam direction of a set of beam directions of an antenna array of the communication system, determining a level of a passive intermodulation, PIM, signal at a receiver of the communication system, the PIM signal being caused by a set of signals transmitted by the antenna array in the beam direction, identifying beam directions of the set of beam directions whose PIM level is higher than a predefined threshold, adapting a beamforming of signals in at least part of the identified beam directions to mitigate the PIM level at the receiver.

Passive intermodulation aware beamforming

An apparatus includes an estimation circuitry configured to receive a first set of one or more digital signals of transmitters of a communication system, and capture a set of one or more radio frequency signals that have been generated from the first set of digital signals The set of radio frequency signals being input of an antenna system of the communication system. Based on the first set of digital signals and the corresponding set of radio frequency signals, a set of weights related to a distortion effect caused by the generation of the radio frequency signals is derived. A received second set of digital signals is weighted using the set of weights, resulting in filtered signals. Using the filtered signals, a correction signal indicative of an interference caused by transmission of the second set of digital signals at a receiver of the communication system is estimated.

Method for processing of passive intermodulation products

A method comprises obtaining a transmission signal to be power-amplified in a power amplifier () prior to transmission; separating the transmission signal into two or more polyphase components of the transmission signal; feeding one or more polyphase components of the transmission signal comprised in the two or more polyphase components to each of two or more parallel predistortion circuits (); selecting a dedicated predistortion model and dedicated predistortion coefficients for each of the two or more parallel predistortion circuits (); performing non-linear memory-based modeling on the transmission signal according to the selected dedicated predistortion models and coefficients using the one or more polyphase components; and combining output signals of the two or more parallel predistortion circuits () to form a predistorted transmission signal (y[n]) to be applied to the power amplifier ().

Polyphase digital signal predistortion in radio transmitter

To take into account a passive intermodulation, resource blocks are associated with information indicating passive intermodulation impact of a corresponding resource block. The resource blocks are scheduled using the information.

Scheduling in wireless communication networks

The present invention provides methods, apparatuses and a program relating to detecting passive intermodulation in broadband communication. The present invention includes transmitting, at a base station, a first signal at a first centre frequency and a second signal at a second centre frequency with a predetermined transmit power, capturing, at the base station, received signal at a reception frequency, obtaining, at the base station, a delay between the transmitted signal and a passive intermodulation caused received signal.

Detecting intermodulation in broadband communication affecting receiver sensitivity

The present invention addresses apparatuses, methods and computer program product for providing improved distance to fault measurement for voltage standing wave ratio (VSWR) on antenna line in networks. An embodiment of the present invention comprises the steps of transmitting a signal to a line to be tested, capturing a forward signal of the signal, capturing a reverse signal of the signal, separating the reflection of the signal in time domain via cross correlation of the forward signal and the reverse signal, and detecting a distance to fault in the line by searching and processing maximum peak position of the captured and separated signals.

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Munich, Germany

Jan Hellmann