Alcatel Lucent

Alcatel

Jürgen Otterbach

Hardy Halbauer

Peter Jaenecke

Gabriele Schwoerer

Bozo Cesar

Mark Doll

Oliver Stanze

Bernd Gloss

Karsten Oberle

Robert Fetscher

Gunther Jacob

The present invention relates to a method for reducing interference in the downlink direction of a cellular radio communication system comprising base stations communicating with terminals using a frame structure showing a time and frequency extension, said frame comprising a preamble portion and at least one data portion, said terminals being adapted to receive frames for which the receive power of said at least one data portion is varying in a predefined range relative to the receive preamble power of said preamble portion, According to the present invention, the method comprises the steps of:

Method for reducing interference in the downlink direction of a cellular radio communication network and corresponding base station

The invention relates to a multicarrier mobile device comprising a receiver () for receiving a first multicarrier signal being associated with a first communication cell and a second multicarrier signal being associated with a second communication cell, an extractor () for extracting a first signal portion from the first multicarrier signal and for extracting a second signal portion from the second multicarrier signal and a processor () for determining a first interference power on the first signal portion and the second interference power on the second signal portion.

Multicarrier mobile device

A synchronization procedure for a multipoint-to-point CDMA network (), which minimizes the influence on the information transmission. Instead of interleaving communications and synchronization signals timewise, a simultaneous emission is proposed, in which the synchronization signals are superimposed on the communications signals. The synchronization signals are coded with a special synchronization code (), which does not correspond to the CDMA communications code of the information signals, e.g Barker code. In addition, the synchronization signals are sent at a lower amplitude compared with the communications signals. The synchronization signals are also modulated () prior to sending, in particular using alternating multiplication by +1 and &#x2212;1. On the receiving side (), the synchronization signals are detected by demodulation (), correlation () and subsequent accumulation. The transmission capacity for the communications signals is maximized by this procedure and the influence of the synchronization signals on the communications signals minimized.

Transmitting and receiving device for a multipoint-to-point network

It is the object of the invention to make available a method of transferring user data packets from a terminal to a mainframe of an S-CDMA point-to-multipoint system, in which the data transfer is optimized. The method includes the steps of a repeated transmission of reference data packets coded with pilot codes for the duration of the connections between terminals and a mainframe, wherein the reference data packets contain previously known information, and the transmission of user data packets coded with communication codes include the user information to be transferred. In a preferred embodiment of the invention the user data packets are coded synchronously in time to the reference data packets, superimposed on these, and then modulated. Each terminal is allocated a pilot code, and at least one communication code.

Method of transferring user data packets

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Stuttgart, Germany

Jürgen Otterbach