Patent ID: 7843888

Claim:
A method of providing space-time diversity for information to be transmitted from a plurality of T antennas, T≧2, comprising the steps of: in each of a plurality of successive symbol intervals, producing T symbols comprising systematic information and parity information at outputs of each of two recursive systematic convolutional coders, to one of which coders input bits are supplied directly and to the other of which coders said input bits are supplied after interleaving of bit groups for respective symbol intervals in an interleaving block; changing a phase of the symbols from the two coders relative to one another; and selecting first and second different mappings, mapping each of T symbols from said symbols produced by the coders, in respective alternating symbol intervals for supply to the T antennas to provide said space-time diversity, the interleaving and mappings being arranged so that systematic information is selected for all of the input bits in the interleaving block.