Abstract: In a method of communicating between layers of a protocol stack, message data are generated for communicating between a first layer and a second layer of the protocol stack. The message data are incorporated into a data unit by providing an opaque object within the data unit, conforming to a data structure definition supporting extendible schemas, the opaque object including the message data.

Abstract: The present invention is related to a circuit for encoding at least two input symbols by means of a space-time block code, comprising a plurality of multiplexers, each arranged to receive the input symbols and to output a selected symbol, storing means for storing information on which input symbol is to be selected in each multiplexer of the plurality of multiplexers and for storing gain factor information to multiply the multiplexer outputs with, calculation means, coupled with the storing means, for determining an encoded version of the input symbols based on the multiplexer outputs and corresponding gain factors stored in the storing means. The invention further discloses a corresponding circuit for space-time block decoding.