About the book
Next generation wireless networks require massive uplink connections as well as high spectral efficiency. It is well known that, theoretically, it is impractical to achieve the sum capacity of multi-user communications with existing orthogonal multiple access (OMA) techniques, i.e., in time, frequency, and code domains. To meet the challenging requirements of next-generation networks, researchers have explored non-orthogonal and overloaded transmission technologies–known as new radio multiple access (NR-MA) schemes or non-orthogonal multiple access (NOMA)–for fifth generation (5G) or beyond wireless communication networks. In this book, we will discuss the key features of the promising NR-MA/NOMA schemes for the massive uplink/downlink connections. The candidate schemes of NR-MA/NOMA can be characterized by multiple access signatures (MA-signatures), such as a codebook, sequence, power, and interleaver /scrambler. The NOMA allows multiple users to share the same radio resources by using successive interference cancelation (SIC) method. There are several NOMA techniques evolving in the research community which are Power domain NOMA, Code Domain NOMA, multiple inputs, multiple output (MIMO) based NOMA, orthogonal frequency domain (OFDM) based NOMA, Pattern Division Multiple Access (PDMA), Sparse Code Multiple Access (SCMA), Multi-user Shared Access (MUSA), non-orthogonal coded multiple access (NCMA), non-orthogonal coded access (NOCA), Group orthogonal coded access (GOCA), Interleave-division multiple access (IDMA), interleave grid multiple access (IGMA), a repetition division multiple access (RDMA), and resource spread multiple access (RSMA). A general guideline for system model of the above schemes, transceiver design, interference cancelation, physical layer security, and system performance will be provided in this book. The idea can be extended but not limited to mmWAVE and terahertz communication.