Imec

Katholieke Universiteit Leuven

Agilent Technologies, Inc.

Interuniversitair Microelektronica Centrum (imec)

Geert Leus

Frederik Petré

Marc Moonen

The present invention is related to a method for multi-user wireless transmission of data signals in a communication system having at least one base station and at least one terminal where for a plurality of users have robustness to frequency-selective fading added to the data to be transmitted, then grouping data symbols into blocks formed by demultiplexing a serial-to-parallel operation, and spreading and scrambling a portion of the obtained blocks of data, followed by combining spread and scrambled portions of the blocks, adding transmit redundancy to the combined spread and scrambled portions which is then transmitted.

CDMA transceiver techniques for wireless communications

A method and system for retrieving a desired user data symbol sequence from a received signal are disclosed. In one embodiment, the method includes i) receiving a channel modified version of a transmitted signal comprising a plurality of user data symbol sequences, each being encoded with a user specific known code, ii) determining an equalization filter directly and in a deterministic way from the received signal and iii) applying the equalization filter on the received signal to thereby retrieve the transmitted signal.

Wideband multiple access telecommunication method and apparatus

The present invention is related to a system and method for wideband multiple access telecommunication. In the method, a block is transmitted from a basestation to a terminal. The block comprises a plurality of chip symbols scrambled with a base station specific scrambling code, the plurality of chip symbols comprising a plurality of spread user specific data symbols which are user specific data symbols spread by using user specific spreading codes and at least one pilot symbol. In the terminal, at least two independent signals that comprise at least a channel distorted version of the transmitted block are generated. The two independent signals are combined with a combiner filter with filter coefficients which are determined by using the pilot symbol, thus a combined filtered signal is obtained. The combined filtered signal is despread and descrambled with a composite code of the basestation specific scrambling code and one of the user specific codes.

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Hasselt, Belgium

Geert Leus