A quasi-orthogonal space-time block code

It has been shown that a complex orthogonal design that provides full diver sity and full transmission rate for a space-time block code is not possible for more than two antennas. Previous attempts have been concentrated in ge neralizing orthogonal designs which provide space-time block codes with ful l diversity and a high transmission rate. In this work, we design rate one codes which are quasi-orthogonal end provide partial diversity, The decoder of the proposed codes works with pairs of transmitted symbols instead of s ingle symbols.