Alcatel Lucent

Alcatel N.v.

Alcatel

Hans-Peter Mayer

Thorsten Wild

Hajo Bakker

Volker Braun

Uwe Doetsch

Dietrich Zeller

Klaus Wunstel

Michael Ohm

Osman Aydin

Rolf Sigle

Olaf Hildebrand

Dieter Baums

Heinz Schlesinger

Werner Rehm

Carsten Haase

Holger Hempel

Walter Hoffmann

Voker Braun

Holger Heimpel

The invention relates to a method for synchronizing RF antenna signals (to) of a plurality of RF antenna sites (to) arranged at different locations of a radio transmission system (), the method comprising; generating a reference signal () in a reference oscillator () located at a central unit () of the radio transmission system (), transmitting the reference signal () as an optical signal from the central unit () to the RF antenna sites (to) via a plurality of optical fiber links (&#x2033; to&#x2033;), and using the transmitted reference signal () for synchronizing the RF antenna signals (to) of the different RF antenna sites (to), The invention also relates to a radio transmission system ().

Antenna synchronization for coherent network MIMO

The invention relates to a method for communication in a wireless telecommunication system, wherein the wireless telecommunication system comprises a plurality of base stations () and at least one computing cloud (), wherein the plurality of base stations are each connected to the at least one computing cloud, wherein the computing cloud comprises a plurality of computing devices, wherein the computing cloud is operatively coupled to the plurality of base stations, and wherein the method comprises the following steps: performing (S) time-critical operations by the plurality of base stations; performing (S) non-time-critical operations by the at least one computing cloud for the plurality of base stations; and exchanging (S) control data between the plurality of base stations and the at least one computing cloud; wherein the non-time-critical operations comprise at least one of the following operations: handover procedures, call admissions, load balancing, gathering statistical data of cells of the wireless telecommunication system, configuration management for the cells of the wireless telecommunication system, and operations for self organizing functions of the wireless telecommunication system, and wherein the control data is used by the computing cloud for performing the non-time-critical operations.

Computing cloud in a wireless telecommunication system

The invention concerns a method for interleaving a dedicated set of bits that is divided in an appropriate number of blocks using for each block an interleaver matrix with a predefined first dimension for interleaving the bits within each block, whereby said appropriate number of blocks is estimated in such a way that a value of a second dimension of the interleaver matrix that is needed to interleave the bits within each block lies within a dedicated range, a base station (BS-BS), a user terminal (T-T) and a communication network (CN) therefor.

Method for interleaving bits, a base station, a user terminal and a communication network therefor

A planar lightwave circuit (PLC) () comprises an optical device, where the optical device comprises at least one piece of waveguide structure (), in particular one piece of fiber, which has at least one thin film layer deposited on an end facet (). Thus, a thin film filter can be integrated in a PLC with minimized insertion loss and high mechanical stability for athermalization.

Thin film filter with waveguide substrate

An optical duplexer, configured as a directional coupler, is integrated into an optical coupling arrangement with a fiber optic pigtail, constructed in planar-optical hybrid technology on a substrate (1). To reduce the required surface area and decrease optical cross talk, the branch of the directional coupler (waveguide 6, branch 7) is sharply bent. The bend is equipped with a reflecting mirror (11) integrated opposite the inner edge (10) of the bend. Furthermore, the waveguiding end of the bent branch (7) is equipped with a cylindrical lens. A laser diode (8) is located before this, and a photodiode (5) is located before the angled end of the straight-line integrated waveguide (2).

Optical coupling arrangement

A circuit arrangement is presented for an optical modulator with an optical modulator diode (MD) driven in the blocking direction which, in addition to a shunt resistor (RN) wired in parallel with the modulator diode, contains a damping resistor (RD) wired ahead of the modulator diode, for attenuating unwanted reflections. The damping resistor is preferably wired ahead of the parallel circuit of modulator diode and shunt resistor, and forms part of the terminal resistance of the connecting line carrying the modulation signal (U.sub.m).

Optical modulator circuit

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Ditzingen, Germany

Hans-Peter Mayer