Agence Spatiale Europeenne

European Space Agency

Politecnico Di Torino

Nader Alagha

Guido Montorsi

Giulio Colavolpe

Farbod Kayhan

Amina Piemontese

Andrea Modenini

A method for design an optimized constellation set and labeling for satellite point to multi-point transmission systems including transmitters and receivers, wherein the transmitters are adapted to create signals overlay and are configured to allow simultaneous transmission of at least two different data streams (services) intended for users with different radio link qualities. In particular, N services are provided to users having a good radio link and a subset of services is maintained and guaranteed for the users having a lower radio link quality condition.

Signal overlay design and detection for satellite communication channels

A data detection method, having the steps of: a. receiving a signal transmitted over a communication channel, the signal being representative of at least a stream of interfering symbols x, each representing one or more bits of a transmitted message; b. filtering the received signal through at least a filter bank having at least a first filter representative of a linear response of the channel and a second filter representative of a non-linear response of the channel, and sampling the filtered signals at the symbol rate, thus obtaining respective sequences of filtered samples rr; and c. jointly computing the a posteriori probabilities of N&#x3e;1 consecutive symbols x. A data detector for carrying out such a method, and a method of transmitting data over a nonlinear channel, optimizing spectral efficiency when data detection is performed using such a method is also provided.

Data detection method and data detector for signals transmitted over a communication channel with inter-symbol interference

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Wassenaar, Netherlands

Nader Alagha