Fraunhofer-Gesellschaft Zur Foerderung Der Angewandten Forschung E.V.

Friedrich-alexander-universitaet Erlangen-nuernberg

Joerg Robert

Josef Bernhard

Gerd Kilian

Johannes Wechsler

Jakob Kneissl

Albert Heuberger

Wolfram Strauss

Hamed Kenawy

Hazem Elsaid Ibrahim

Frank Obernosterer

Michael Schlicht

Raimund Meyer

Stefan Ereth

Wolfgang Koch

Dominik Soller

Eberhard Gamm

Embodiments provide a controller for a participant of a communication system wirelessly communicates in a frequency band used for communication by a plurality of communication systems, wherein the controller is configured to identify a network-specific channel access pattern, wherein the network-specific channel access pattern indicates a frequency hop-based and/or time hop-based occupancy of resources of the frequency band that is usable for the communication of the communication system, wherein the controller is configured to identify a relative channel access pattern, wherein the relative channel access pattern indicates, from the usable frequency hop-based and/or time hop-based occupancy of resources of the network-specific channel access pattern, an occupancy of resources that is to be used for the transfer of data of the participant.

Channel access via hierarchically organized channel access patterns

Embodiments provide a transfer method for transferring data of variable length using a fixedly specified number of sub-data packets to which the data of variable length is distributed.

Variable sub-packet lengths for telegram splitting in networks with low power consumption

Embodiments provide a transmission method of wireless transmission of data within a communication system (e.g. a sensor network or telemetry system). The system includes a step of transmitting the data while using at least two time hopping patterns and/or frequency hopping patterns, a second pattern of the at least two patterns being a time- and/or frequency-shifted version of a first pattern of the at least two patterns.

Optimized hopping patterns for different sensor nodes and variable data lengths on the basis of the telegram splitting transmission method

A data receiver configured to receive a signal having at least two partial data packets, the data receiver being configured to estimate a state of a transmission channel, to obtain first channel state information, to demodulate a first set of received symbols from different data packets, to obtain a first set of received encoded bits, wherein the data receiver is configured to decode the first set of received encoded bits to determine, a first set of estimated encoded bits which corresponds more likely to a first set of transmitted encoded bits than the received encoded bits, and to map the first set of estimated bits to estimated transmission symbols using a mapping rule matching a transmitter-side mapping rule to obtain a first set of estimated transmission symbols, and to determine second channel state information using the first set of estimated transmission symbols.

Decoder-supported iterative channel estimation

A transmitter is configured to transmit at least one signal with a pilot sequence having a plurality of pilot symbols, wherein the transmitter has a signal generator, wherein the signal generator provides the pilot sequence, wherein the signal generator provides the pilot sequence such that the pilot sequence has at least two symbol groups each having at least two pilot symbols, and the symbol groups, when evaluating a signal received by a receiver as a result of the transmission of the signal with respect to a phase, the symbol groups generate phase errors that depend on a temporal off-set between a reference point in time of the transmission of the signal by the transmitter and a value assumed and/or estimated for the evaluation for the reference point in time, said phase errors essentially mutually compensating each other across the symbol groups in the evaluation.

Transmitter and receiver and corresponding methods

A transmitter is configured to transmit signals each having a pilot sequence including a plurality of pilot sequence symbols, wherein the transmitter includes a signal generator, wherein the signal generator is configured to provide the pilot sequence starting from a base sequence which includes a plurality of base sequence symbols, wherein the signal generator provides the pilot sequence symbols starting from the base sequence symbol successively repeated R&#x2212;1 times, and wherein R is a natural number greater than or equal to two, wherein the base sequence is configured such that a correlation of the pilot sequence with a transmission signal formed from the pilot sequence has a main maximum which is as narrow as possible and/or secondary maximums which are as small as possible.

What is described is an Radio Frequency Identification (RFID) tag configured for communicating with an Radio Frequency Identification (RFID) reader, wherein the RFID tag is configured to receive a query command from the RFID reader, to measure a duration of a TRcal signal comprised by the query command, and to determine an individual Backscatter Link Frequency for communicating with the RFID reader based on the measured duration of the TRcal signal. The invention also refers to an RFID reader and to a corresponding method.

RFID tag and RFID reader

An RFID reader includes a transmitter, a receiver, and an evaluator. The receiver receives signals from RFID tags within a given number of slots of a time frame with a given frame size and provides a number of successful slots and a number of collided slots. The evaluator sets a modified frame size based on an estimated number of RFID tags which is determined based on the frame size, the number of successful slots, and the number of collided slots. The invention also refers to a corresponding method.

RFID reader and method for recognizing RFID tags

Embodiments provide an RFID reader. The RFID reader includes a collision detector, a decoder and a frame length adjuster. The collision detector is configured to detect for each slot of a plurality of slots of a current frame, in which a collision of signals transmitted by at least two RFID tags occurred, a signal property of a signal of the signals transmitted by at least two RFID tags. The decoder is configured to decode for the slot in which the collision is detected the signal of the signals transmitted by the at least two RFID tags using the detected signal property, wherein a collision recover probability describing a probability that the decoder can accurately decode the one signal depends on a signal-to-noise ratio (SNR) of the current frame. The frame length adjuster is configured to adjust a frame length of a subsequent frame in dependence on the collision recover probability.

RFID reader and method for adjusting a frame length of an RFID system comprising an RFID reader

A reader for wirelessly receiving a signal from a tag, the signal having a portion on a first side, a portion on a second side and a synchronization sequence to be detected between the first and the second side, wherein the portion on the first side, the synchronization sequence and the portion on the second side are serially arranged with each other, has a processor. The processor is configured for storing the received signal, for detecting the synchronization sequence in the received signal, for calculating a transmission characteristic between the tag and the reader, using the portion of the received signal on the first side and for extracting a payload information from the portion of the received signal on the second side, using the calculated transmission characteristic.

Growing community of inventors

Uttenreuth, Germany

Joerg Robert