A non-iterative blind signal separation algorithm based on transmit diversity and coding

This paper presents a deterministic blind signal separation algorithm. The algorithm assumes transmit diversity, i.e. each user is equipped with at least two transmit antennas. Through each antenna the same symbol sequence is transmitted but coded in a different way. This coding does not require any extra bandwidth or power and allows one to remove multiple access interference (MAI) in a non-iterative way. The algorithm is applicable for any modulation format and forms an extension of the algorithm of Vandaele, Lens and Moonen (see Proceedings of the 2nd IEEE Workshop on Signal Processing Advances in Wireless Communications (SPAWC), Annapolis, MD, USA, p.98-101, 1999) which is only applicable for BPSK modulation. We further demonstrate how coding combined with transmit diversity increases robustness to intersymbol interference (ISI) and order detection problems.