A New 2×2 Coordinate Interleaved STBC for High-Rate Wireless Systems

In this paper, we present a new full-rate, full-diversity coordinate interleaved design (CID) for multiple-input multiple-output (MIMO) systems with two transmit antennas. When compared with the conventional space-time block codes (STBCs) and coordinate interleaved orthogonal designs (CIODs), the proposed scheme is above the predefined full-rate limits since we ignore the pure orthogonality principle while transmitting extra symbols from available slots. The higher complexity of this structure due to non-orthogonality is reduced by using a simple conditional maximum-likelihood (ML) decoder. The new CID achieves full-diversity with a high minimum determinant, and outperforms its counterpart given by Sezginer and Sari with certain constellations, which make it to be considered for the future high data rate wireless applications.