Cognitive Radio-Based Non-orthogonal Multiple Access
Cognitive Radio-based Non-orthogonal Multiple Access (CR-NOMA) is a derivation of NOMA. In CR-NOMA, a user with bad channel condition is viewed as the primary user (PU), while a user with good channel condition is regarded as the secondary user (SU), which is squeezed into the spectrum occupied by PU (Ding et al. 2016). CR-NOMA opportunistically serves one user on the condition that other users’ Quality of Service (QoS) is guaranteed.
The advent of CR-NOMA is driven by the advantages of NOMA and CR. Recently, NOMA has attracted increasing attention because of its high spectral utilization. At the transmitter side, multiple users’ signals can be transmitted simultaneously in time domain, frequency domain, or code domain by utilizing power domain multiplexing. At the receiver side, the multiplexed signals can be separated by using Successive Interference Cancellation (SIC). Thus, the resource block...
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