Multiuser-Interference-Free Space–Time Spreading MIMO Systems Based on Three-Dimensional Complementary Codes


This paper proposes a replacement sort of complementary code, i.e., 3-D complementary code (3DCC), that integrates space–time coding and code division multiple access under a unified framework for multiple-input–multiple-output (MIMO) system implementation. Thanks to its ideal correlation properties, the 3DCC ensures orthogonal transmissions among users and antennas. Analytical studies given during this paper will show that the proposed 3DCC-MIMO system is ready to support each transmit diversity and multiplex at the same time, with its distinctive agility to change between them in keeping with completely different channel environments and system configurations. Additionally, multiuser interference (MUI) is eliminated in a very 3DCC-MIMO system for each synchronous and asynchronous transmissions over a flat-fading channel with a relatively low complexity. Simulation results also are provided to verify the correctness of research and demonstrate the prevalence of the proposed MIMO system in terms of its MUI-free performance.

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