A novel pre-coding orthogonal full diversity space-time block coding scheme for 4×4 MIMO system

In this paper we consider a novel design of space-time block code combined with pre-coding module transmission system. Theory of orthogonal designs has shown that such code cannot be simultaneously orthogonal, of rate 1, with full diversity order, for more than 2 transmit antennas. We propose in this paper a new way to overcome this limitation by adding a pre-coding module before transmitting space-time block signals, this scheme is a rate 1 coding scheme with full diversity, and is also an orthogonal one thanks to the new adding pre-coding weights.