2019/11/13 by Nora Boulaioune, Boulaioune, Nora, Nandana Rajatheva +3
Computer Science · Engineering · #Advanced MIMO Systems Optimization #Advanced Wireless Communication Techniques #FOS: Computer and information sciences #Information Theory (cs.IT) #Wireless Communication Networks Research
paper · pdf · doi:10.48550/arxiv.1911.05347
openalex publication_date 2019/11/13 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
In this paper, a proposal to improve the reliability of a downlink multiuser\n(MU) MIMO transmission scheme is investigated with the use of a new approach in\northogonal space-time block codes (OSTBC) and network coding with a\nsuperposition modulated system and side information. With the new encoded OSTBC\napproach, diversity is offered where each user receives all other users'\nsymbols, which allows the recovery of symbols in several ways. In addition,\nmultiple users can be accommodated with the same resource, which is quite\nuseful in a wireless system where resources are always restricted. By employing\nsuperposition modulation, the side information needed for error recovery can be\ntransmitted over the same resource used for the normal information frame. In\naddition, the proposed system exploits diversity through a novel technique of\nsub-constellation alignment-based signal combining for efficient side\ninformation dissemination. A detailed analysis of the new OSTBC approach is\ncarried out. It is shown that the performance of the MU-MIMO system can be\nimproved significantly in terms of block and frame error rates (BLER, FER)\nconsidered as reliability measures. By accommodating a reasonable number of\nmultiple users, high reliability is achieved at the expense of the rate. To\ncompensate for the low rate, conventional OSTBC can be considered and\nsimulation results are shown, where, as a penalty to pay, multiple orthogonal\nresources are required.\n