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Abstract

A method for data transmission in a radio data transmission system having a plurality of parallel single-input single-output or multiple-input multiple-output channels over which the data is transmitted, the data represented by a plurality of data symbols, the data symbols being spread prior to transmission by a plurality of spreading sequences is described. The method comprises determining a system value λk for each signature sequence k of a plurality of signature sequences K, wherein the system value λk is indicative of a signal-to-noise ratio of the associated signature sequence k; determining a number of signature sequences K* to be used for spreading the data symbols in accordance with the system values λk associated with the plurality of signature sequences K, selecting the signature sequences S to be used to spread the data symbols from the plurality of signature sequences K in accordance with the system values λk associated with the plurality of signature sequences K, wherein the number of signature sequences selected corresponds to the determined number of signature sequences K*, and spreading the data symbols using the selected signature sequences S.

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