QPSK super-orthogonal space-time trellis codes with 3 and 4 transmit antennas

Abstract

International audienceIn this paper, we propose, for the first time, QPSK super-orthogonal space-time trellis codes (SO-STTCs) with 3 and 4 transmit antennas and with more than 4 states. In order to decrease drastically the search time of the best SO-STTCs with 3 and 4 transmit antennas, a matrix representation of codes and an adaptation of the coset partitioning are proposed. Thus, we obtain good SO-STTCs with more than 2 transmit antennas. We demonstrate by simulations that the new proposed SO-STTCs outperform the best corresponding STTCs

A new differential space-time modulation scheme for MIMO systems with four transmit antennas

“…Furthermore, as in [13]- [15], the performance of this new differential scheme can be improved by selecting the set of transmission matrices having the best distance spectrum. The new scheme can be extended to MIMO systems with more transmit antennas (8 or 16) using the Kronecker product…”