Alcatel

Alcatel Lucent

Alcaltel

Primo Garofoli

Claudio Colombo

Mario Giovanni Frecassetti

Silvio Cucchi

Alberto Lometti

Giuseppa Licata

A method and apparatus are described for transmitting/receiving a Gigabit-Ethernet signal by a high capacity point-to-point radio system. The basic idea consists in transmitting a Gigabit Ethernet interface using a single frequency in a channel plan of about 56 MHz bandwidth. The invention is based on a technology that combines forward error correction, cross polarization interference cancellation (XPIC), base-band signal processing, adaptive equalization and antenna's interconnection. In the best configuration, two carrier frequencies, H and V polarized, are selected in order to have the required bandwidth for easily transporting a Gigabit Ethernet. A proper compression rate can be selected according to the available resources; in case of radio channel failure, the compression rate can be changed. Ethernet frames are mapped by a Generic Framing Procedure encapsulation protocol.

Method and apparatus for transmitting a gigabit-ethernet signal by a high capacity point-to-point radio system

Described is a method and apparatus for mapping Fast Ethernet data interfaces (in addition to possible data interfaces of different type) into a single VC-4 Virtual Container of a STM-1/OC-3 payload transmitted to a radio-link system. The method is characterized by the steps of: packeting the Fast Ethernet signal and any other signal, mapping the packets into a single (VC-4) Virtual Container of a STM-1/OC-3 payload of a SDH/SONET signal frame, and transmitting said signal frame through the point-to-point radio-link, said radio link being a point-to-point SDH/SONET radio link. All the packets have the same format and are associated to a header for identifying the source. The interfaces of different type are conveniently grouped. Possibly, the VC-4 is filled with null packets to exhaust the maximum available capacity.

Method and apparatus for mapping fast ethernet data interfaces into a single VC-4 virtual container of a STM-1/OC-3 payload transmitted in a radio-link system

Described is a method and system for increasing the spectrum efficiency in a radio transmission system. Advantageously, the interference phenomenon is used for transmitting two different signals, by utilizing for each of them carriers at the same frequency, thus obtaining in this way a doubling of the spectrum efficiency. Practically, the same signal is transmitted by two different antennas in order to have two coherent signal sources. On the receiving front, there are points of maximum and minimum of this signal. If the original signal is properly phase shifted with an antenna vis-&#xe0;-vis the other one, the effect will be to arrange the maxima and minima on the receiving front in a corresponding way. The present invention allows for the use of dual polarization antennas (H and V or any other type of orthogonal polarization) to obtain a still higher spectrum efficiency.

Method and system for doubling the spectrum efficiency in a radio transmission system by transmitting the same signal from two different antennas

A method and device is described for converting an STM-signal into a sub-STM-signal in synchronous radio transmission. The invention provides for the use of a pure regenerator network element without any multiplexing function. The method according to the invention provides in transmission, for reducing the received STM-signal by one third (only the first TUG-is considered as valid and is transmitted in the radio link, whereas the second and the third TUG-are considered in an unequipped condition and are not transmitted), thus maintaining the STM-structure. In reception, the method provides for reconstructing the signal with the complete regenaration of the payload and the correct structure of the AU-without incurring any parity control infringement.

Method and device for converting an STM-1 signal into a sub-STM-1 signal and vice-versa in radio transmission

A method is described for transmitting/receiving STM-4 (SDH) or STS-12 (SONET) digital signals over two RF carriers in a radio regenerator section. The method provides for performing, in transmission, a de-interleaving operation of the standard frame to be transmitted in such a way as to subdivide it by columns into two sub-frames. The RSOH bytes of the standard frame are terminated and transmitted over the two working channels or over one service channel and one working channel so as to be protected in a 1+1 configuration: In reception, a column interleaving operation recombines together the two sub-frames and recovers and correctly rearranges the RSOH bytes so terminated as to obtain the standard frame originally received from the transmitter. The generated sub-frames are synchronized with the standard frame.

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Milan, Italy

Primo Garofoli