ABSTRACT
Cooperative power-domain (CPD) non-orthogonal multiple access (NOMA) has emerged as a promising technique to enhance the performance of 5G systems by improving spectral efficiency and accommodating more users. This chapter presents the potentials and challenges of CPD NOMA in 5G systems. This chapter highlights the potential advantages of CPD NOMA, such as increased system capacity and improved energy efficiency. By allowing multiple users to share the same time and frequency resources, NOMA can support a larger number of connections and cater to the massive connectivity demands of 5G. Furthermore, we discuss how CPD NOMA can be integrated with other technologies, like massive multiple input and multiple output (MIMO) and millimeter-wave (mm-wave) communications, to unlock even higher gains in spectral efficiency and system performance. However, alongside its potentials, the chapter also addresses the key challenges that need to be overcome to fully exploit the benefits of CPD NOMA. These challenges encompass power allocation optimization, user clustering techniques, and interference management strategies. In conclusion, CPD NOMA holds significant potential for revolutionizing 5G systems by providing increased capacity and energy efficiency. By addressing these challenges, CPD NOMA can pave the way for more efficient and robust 5G networks to meet the ever-growing demands of the modern wireless communication era.
