Alcatel Lucent

Alcatel N.v.

Alcatel Sel Aktiengesellschaft

Heinz Schlesinger

Bernd X Weis

Cornelis Hoek

Michael Tangemann

Hans-Peter Mayer

Thomas Bohn

Xin Yu

Anke Schmietainski

Embodiments relate to a multiband transceiver apparatus (), comprising a first transmit path () operable to transmit a first transmit signal (sig) in a first radio frequency band (RF), wherein the first transmit path () comprises an input (), an output () and a first feedback path () from the output towards the input of the first transmit path, a second transmit path () operable to transmit a second signal (sig) in a second radio frequency band (RF), the second radio frequency band (RF) being different from the first radio frequency band (RF), wherein the second transmit path () comprises an input (), an output () and a second feedback path () from the output towards the input of the second transmit path, and a cross-talk canceller () operable to cancel cross-talk from the second feedback path () to the first feedback path () and/or to cancel cross-talk from the first feedback path () to the second feedback path () of the multiband transceiver apparatus ().

Cross-talk cancellation in a multiband transceiver

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

A method of controlling a tuneable filter () of an antenna network () for use in a base station (). The proposed method comprises:

Tuneable filter control method and base station

A telecommunication device (11) for vehicle installation is proposed, which is equipped with an HF-transmitting and receiving device (22, 23), with different terminals and with a transmission network (19) between the HF-transmitting and receiving device and the terminals. The telecommunication-specific part of each terminal is physically separated from the actual user part (12, 13, 14) of the terminal, and installed in a central terminal control (15), which is connected with the HF-transmitting and receiving device (22). An efficient, optical transmission network (19) may be provided between the terminal control (15) and the user parts (12, 13, 14) of the terminals. Both the central terminal control (15) and the user parts (12, 13, 14) of the terminals are equipped with an interface unit for the transmission network (19). The telecommunication device (11) is less voluminous than a conventional device with individual terminals, and therefore more suitable for installation in the vehicle.

Radio-telecommunication device in vehicles

To assign a carrier frequency to different mobile stations in a conventional Space Division Multiple Access (SDMA) radio system, the stations are differentiated according to the direction in space from which they transmit radio signals to a base station. In addition, the distances between the base station and the mobile stations are compared. To prevent interference at the receiving site (base station BTS), according to the invention a carrier frequency (f) is assigned to the different mobile stations (MS1 to MS3) only if the directions in space (.THETA.1 to .THETA.3) are sufficiently different and the receive levels (P1 to P3) of the radio signals are sufficiently equal. To that end, each mobile station (MS1 to MS3) is assigned a guard area, which encompasses at least a preselected solid angle (lobe width w) and at most a preselected level space (dynamic range S). Any further mobile station wanting a radio link with the base station on the same carrier frequency (f) must be located in a permissible zone (Z) between the guard areas, which comprises a level range (zP) that is common to all preceding mobile stations. A further guard area is defined with each further connection, and the permissible zone (Z) is determined anew. The full capacity of the carrier frequency (f) is only attained when the permissible zone (Z) becomes so small that it no longer comprises sufficient space for the solid angle (w).

Assignment of a carrier frequency in an SDMA radio system

A frame-structured bus system, particularly for a local operation network for automotive applications, is disclosed in which a plurality of bus stations share a data bus, and in which one of the bus stations generates a sequence of data frames of constant bit length. Each data frame includes an isochronous frame module and an asynchronous frame module, and the division of each data frame into the isochronous and asynchronous frame modules is dynamically variable. The message transmitted by a station is passed through a central star coupler to all stations. A frame clock is generated by a frame clock generator and sent to the central star coupler, with the time sequence of the data frames of the frame clock defining a reference frame clock, and the other stations of the local operation network determining an individual frame transmit clock, such that the respective message transmitted by a particular station, taking into account the propagation delay to the central star coupler, arrives at the central star coupler at that instant relative to the reference frame clock at which this message has to be inserted into the data frame present in the central star coupler.

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Mundelsheim, Germany

Heinz Schlesinger