Nokia Corporation

Spyder Navigations LLC

Djordje Tujkovic

Matti Latva-Aho

Marian Codreanu

Emiliano Sottani

A method for performing a space-time coding of an information signal to be transmitted by a multi-channel communication system includes demultiplexing received signals into at least two first space-time coded signals and at least two second space-time coded signals, obtaining a first decoding output signal by using a first decoder performing a first space-time decoding based on the at least two first space-time coded signals and a first a-priori probability signal, applying the output of one of a first decoder or a first conversion unit converting the output of the first decoder to a first substracting unit where an a-priori information signal is subtracted, scrambling the output of the first subtracting unit so as to generate a scrambled extrinsic information, applying one of the scrambled extrinsic information or an output of a second conversion unit converting the scrambled extrinsic information as a second a-priori probability to a second decoder receiving that at least two second space-time encoded signals, applying the output of one of the second decoder or a third conversion unit converting the output of the second decoder to a second subtracting unit which has another input receiving the scrambled extrinsic information, generating a descrambled signal based on the output of the second subtraction unit, and applying the descrambled signal or an output of a fourth conversion unit as the first a-priori probability signal to the first decoder.

Concatenated space-time coding

The invention is related to a data loading method in a communication system where sub-carriers include eigenmodes, comprising, for instance: arranging eigenmodes into a predetermined number of clusters, each cluster comprising eigenmodes of different quality levels; pre-allocating transmission power to the eigenmodes with the aid of the calculated required power for achieving the approximated signal-to-noise ratio; determining collective transmission power to be allocated to each cluster based on the pre-allocation; allocating collective transmission power to the eigenmodes.

Data loading method, transmitter, and base station

A method and system for processing information data in a wireless communications system for reducing the complexity in spatial multiplexing of signals over different transmit antennas. In orthogonalized spatial multiplexing with the resolution of one, encoded data are interleaved and converted into a plurality of parallel sub-streams. Each sub-stream is then spreaded with a user specific spreading code with an intentional delay offset of few chips prior to modulating the encoded data for transmission. Likewise, in orthogonalized spatial multiplexing with the resolution of two, encoded data are interleaved and converted into a plurality of parallel sub-stream pairs. Each sub-stream pair is spreaded pairwise with a user specific spreading code with an intentional delay offset of few chips.

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Oulu, Finland

Djordje Tujkovic