A constellation design based on direct insertion and decoding algorithm for noncoherent unitary space-time codes

A novel scheme of unitary space-time constellations generation based on zero vectors adding are proposed for the multiple-antenna communication system. In the scheme, T₂ zero row vectors are added into conventional unitary matrices directly, and the number of new unitary matrices obtained by different positions of the added zero vectors in T symbol duration is ⌊T/T₂|⌋ times larger than that of conventional unitary matrices. According to the special construction, a corresponding decoding algorithm is proposed with low complexity in flat fading channel. Simulation results show that the proposed the constellation outperform the conventional constellations and the proposed decoding algorithm is efficient and simple.