Infineon Technologies Ag

Maven Wireless Sweden Ab

Intel Mobile Communications Gmbh

Infineon Technologies Wireless Solutions Sweden Ab

Intel Deutschland Gmbh

Lantiq Deutschland Gmbh

Infineon Technologies LLC

Michael Lewis

Mikael Hjelm

Elmar Wagner

Christian Grewing

Stefan Van Waasen

Mikael Rudberg

Jan-Erik Eklund

Detlev Theil

Etan Shirron

Johan Oestergren

A method of transporting digital data in an active distributed antenna system DAS. The method includes receiving data from at least one data source, processing the received data, and providing the processed data as digital real-valued passband data for further transport within the DAS. An apparatus and computer program configured to perform the method are also provided.

Transporting digital data in a distributed antenna system

A method of configuring a distributed antenna system ('DAS') having digital remote units configured to provide a DAS interface to wireless communication devices connecting to the DAS, and at least one digital master unit configured to provide a DAS interface to base stations connecting to the DAS. The method includes connecting digital remote units such that each digital remote unit is connected either to at least another digital remote unit and the digital master unit or to at least two other digital remote units. The method further includes connecting at least one of the digital remote units either to other the digital remote units and the digital master unit, or to at least three other digital remote units, and connecting the digital master unit to at least two of the digital remote units, thereby providing at least one path for redundant data transport.

Distributed antenna system providing redundancy

A method performed by a digital Distributed Antenna System ('DAS') for routing aggregated carriers received by at least one digital master unit of the DAS to at least one digital remote unit of the DAS. The method includes identifying the received aggregated carriers to be transmitted to a wireless communication device located in a coverage area served by the at least one digital remote unit, and routing the identified aggregated carriers through the DAS such that the carriers are transported to said at least one digital remote unit for transmission to the wireless communication device.

Routing aggregated carriers in a distributed antenna system

Mechanisms for controlling sample rate and frequency shift of a digital signal in a multi-operator network. A method is performed by a network node. The method includes obtaining a frequency difference and a phase difference between two clock domains. One of the clock domains is associated with a radio access network of a network operator of the multi-operator network and the other of the clock domains is associated with a distributed antenna system in the multi-operator network. The method includes controlling sample rate conversion of the digital signal between the two clock domains using the phase difference. The digital signal is communicated between the radio access network and the distributed antenna system. The method includes controlling a frequency shift of the digital signal using the frequency difference.

Distributed antenna systems for multi-operator networks

A digital distributed antenna system ('DAS') configured to route at least one reference signal received by at least one digital master unit to at least one digital remote unit. The DAS has at least one processing unit configured to cause the DAS to measure a strength of a received reference signal, determine a required strength that the received reference signal should have upon being transmitted to a wireless communication device located in a coverage area served by the at least one digital remote unit, and adjust a gain of a routing path of the DAS via which the received reference signal is to be routed to an antenna port of the at least one digital remote unit such that the strength of the received reference signal attains the required strength when being transmitted from said at least one digital remote unit.

Automatic configuration of a digital DAS for signal dominance

A system includes a first memory, a second memory, a host processor, and a second processor. The first memory is configured to store first layers of a Bluetooth protocol stack including at least a portion of a link manager layer. The second memory is configured to store second layers of the Bluetooth protocol stack. The second layers have higher real-time requirements than the first layers. The host processor is coupled to the first memory. The host processor is configured to execute the first layers. The second processor is coupled to the second memory. The second processor is configured to execute the second layers.

Partitioned bluetooth system

One embodiment relates to a low intermediate frequency (IF) receiver. The low-IF receiver includes an analog front end that is configured to receive a modulated IQ data signal and provide an in-phase signal and a quadrature signal, where the in-phase signal is phase shifted by approximately 90&#xb0; relative to the quadrature signal. The low-IF receiver further includes a digital processing block, and a single path that provides only one of the in-phase signal and the quadrature signal to the digital processing block. Other receivers and methods are also disclosed.

Low intermediate frequency receiver

The present invention relates to a transmitter in a transmission system operable to optimize estimates of a quantity at a receiver for improved operation. The transmission system includes a transmitting unit connected to a number of antennas (Txm), and to control unit. The control unit controls the transmitting unit to initially transmit an initial training/quantity estimation sequence during an initial training/quantity estimation phase and subsequently transmit a sequence of data symbols such that the information rate of the data symbols is progressively increased.

Operation for backward-compatible transmission

Described herein are techniques related to data communications using a data packet having at least one frame with a robust preamble for use over media having a high degree of non-stationary noise (e.g., impulsive noise). The described techniques employ a preamble with a structure having multiple transitions between the preamble sections. Each transition indicates the start of the upcoming frame. With the techniques described herein, if noise damages the transitions between such sections beyond recognition, the receiver can still determine the frame start time from the one or more of the undamaged transitions. Thus, the robustness of communications via the noisy media is significantly increased.

Method and arrangement for reducing the average time needed for a communication unit to connect to a communication network

A communication system has an audio receiver path, and a digital transceiver path, wherein both paths are integrated on a single integrated circuit. The audio receiver path has a concealment device, and the communication system also has at least one functional block connected to and shared by the both paths. The communication system has a digital controller connected to both paths, the at least one functional block, and the concealment device. The digital controller is operable to schedule the operation of the digital transceiver path, and to inform the concealment device of start and end points of the activity of the digital transceiver path. The concealment device is operable to mask interruptions in the audio stream from the audio receiver path caused during periods of activity of the digital transceiver path.

Sharing at least one functional block in a communication system

A modulator using a polynomial interpolator is described herein. In a simple circuit implementation of the modulator, coefficients of a representative polynomial are generated with interpolation filters in the polynomial interpolator. Crossing points may be identified for each sampling period by incorporating a virtual carrier waveform with the representative polynomial to generate a switching output control. Among other applications, the described modulator may be used in a Class-D amplifier. The described implementations may further confer benefits such as micro-power low voltage operation, low sampling rate, and low harmonic distortion.

Pulse width modulator using interpolator

A method is disclosed of synchronizing a first high data-rate radio transceiver and a second high data-rate radio transceiver. The first high data-rate radio transceiver is associated to a first lower data-rate radio transceiver and the second high data-rate radio transceiver is associated to a second lower data-rate radio transceiver. The method comprises time synchronizing the first and second lower data-rate radio transceivers, determining a timing information concerning operation of the first high data-rate radio transceiver relative to operation of the first lower data-rate radio transceiver, transmitting the timing information to the second lower data-rate radio transceiver, and time synchronizing the first and second high data-rate radio transceivers using the transmitted timing information.

Synchronizing high data-rate radio transceivers

A polar modulator including a signal converter configured to provide a phase signal and an amplitude signal based on at least one received signal is disclosed. A digital-to-analog converter is coupled to the signal converter, the digital-to-analog converter configured to receive an augmented signal, wherein a polarity of the augmented signal is selected to minimize an absolute phase change for sequential signals. A signal mixer is coupled to the digital-to-analog converter to receive an analog signal generated from the augmented signal.

Polar modulator with signed amplitude reducing phase transitions

The present invention relates to a tracking system comprised in a receiver, which tracking system is operable to track rapid changes in frequency and phase offset. The tracking system comprises a first system operable to perform a pilot-based phase and frequency tracking. The tracking system also comprises a second system operable to perform data-based phase and frequency tracking. The tracking system also comprises a control means connected to said first system and to said second system, which control means is operable to gradually reduce the effect of said first system, i.e. said pilot-based phase and frequency tracking.

Tracking system

A system for constructing and deconstructing data packets is disclosed, wherein the system is operable to support a number of different coding formats. The system comprises a processor means operatively coupled to a processor bus. A packet processing data path is attached to the processor bus as a slave via a bus interface means. The packet processing data path comprises a number, n, of blocks, where n is an integer. Respective blocks comprise configuration registers operable to provide information on what operation the blocks should perform for the current packet field being processed. The bus interface means comprises a first register operable to control a bus of Update Enable signals, which bus is also connected to the n blocks. The bus interface means also comprises a second register operable to control a Mode signal, which is also connected to the n blocks.

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Märsta, Sweden

Michael Lewis