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In this paper, a proposal to improve the reliability of a downlink multiuser(MU) MIMO transmission scheme is investigated with the use of a new approach inorthogonal space-time block codes (OSTBC) and network coding with asuperposition modulated system and side information. With the new encoded OSTBCapproach, diversity is offered where each user receives all other users'symbols, which allows the recovery of symbols in several ways. In addition,multiple users can be accommodated with the same resource, which is quiteuseful in a wireless system where resources are always restricted. By employingsuperposition modulation, the side information needed for error recovery can betransmitted over the same resource used for the normal information frame. Inaddition, the proposed system exploits diversity through a novel technique ofsub-constellation alignment-based signal combining for efficient sideinformation dissemination. A detailed analysis of the new OSTBC approach iscarried out. It is shown that the performance of the MU-MIMO system can beimproved significantly in terms of block and frame error rates (BLER, FER)considered as reliability measures. By accommodating a reasonable number ofmultiple users, high reliability is achieved at the expense of the rate. Tocompensate for the low rate, conventional OSTBC can be considered andsimulation results are shown, where, as a penalty to pay, multiple orthogonalresources are required.

High Reliability Downlink MU-MIMO: New OSTBC Approach and Superposition Modulated Side Information