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

Siemens Aktiengesellschaft

Klaus-Dieter Langer

Volker Jungnickel

Joachim Walewski

Clemens Von Helmolt

Jelena Grubor

An adaptive signal processing method to achieve an increase in capacity of data transfer systems, in which control data is returned via a backward channel. The method provides signal processing using an electrical sub-carrier sub-division according to frequency, the electrical sub-carrier with the lowest carrier frequency being permanently used as the backward channel (RC) for transferring control information relating to the current transfer quality of each sub-carrier. An electrical modulation on N parallel sub-carriers takes place in the transmitter (Tx) and then an optical intensity modulation is carried out for a serial data transfer in the optical channel (IRWC). The discrete division of the information to be transferred to the sub-carriers in a real-time operation can take place by the implementation of specific bit-loading algorithms.

Dynamic data-rate adaptive signal processing method in a wireless infra-red data transfer system

In a method and an apparatus for the optical transmission of data by a pulse-width modulated light source (LED), in which a set dimming factor (N) is replaced with a cycle-dependent dimming factor (NI), the cycle-dependent dimming factor is modulated for encoding the data to be transmitted and corresponds to the set dimming factor over a time interval which is resolvable for the human eye.

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Berlin, Germany

Klaus-Dieter Langer