Geniş bantlı çoklu giriş çoklu çıkış kanallar için düşük karmaşıklıklı NOMA map alıcısı

Multiple input and multiple output (MIMO) technology and non-orthogonal multiple access (NOMA) are two important concepts for the next generation communication systems since they bring many advantages over conventional orthogonal systems. While there are numerous research over MIMO and power domain NOMA integration, the combination of MIMO and practical code domain NOMA schemes has not been investigated much in the literature, which is the subject of this thesis. In this study, we propose a generic maximum a posteriori (MAP) receiver based on the Ungerboeck observations from multiuser, where sparse code multiple access (SCMA) and multi-user shared access (MUSA) can be directly adapted. The proposed technique utilizes channel division multiple access (ChDMA) and code domain NOMA schemes on which a novel receiver architecture is structured at significantly reduced complexity. It outperforms conventional MMSE-SIC methods with very limited number of radio frequency (RF) chains and lower complexity. In addition, we provide an analysis in terms of bit-error rate and achievable information rate (AIR) showing mismatched decoding capacity under different code length and overloading scenarios for uplink transmission where flexible structure of MUSA is exploited.