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This paper considers the cooperative device-to-device (D2D) systems withnon-orthogonal multiple access (NOMA). We assume that the base station (BS) cancommunicate simultaneously with all users to satisfy the full informationtransmission. In order to characterize the impact of the weak channel anddifferent decoding schemes, two kinds of decoding strategies are proposed:\emph{single signal decoding scheme} and \emph{MRC decoding scheme},respectively. For the \emph{single signal decoding scheme}, the usersimmediately decode the received signals after receptions from the BS.Meanwhile, for the \emph{MRC decoding scheme}, instead of decoding, the userswill keep the receptions in reserve until the corresponding phase comes and theusers jointly decode the received signals by employing maximum ratio combining(MRC). Considering Rayleigh fading channels, the ergodic sum-rate (SR), outageprobability and outage capacity of the proposed D2D-NOMA system are analyzed.Moreover, approximate expressions for the ergodic SR are also provided with anegligible performance loss. Numerical results demonstrate that the ergodic SRand outage probability of the proposed D2D-NOMA scheme overwhelm that of theconventional NOMA schemes. Furthermore, it is also revealed that the systemperformance including the ergodic SR and outage probability are limited by thepoor channel condition for both the \emph{single signal decoding scheme} andconventional NOMA schemes.

Capacity Enhanced Cooperative D2D Systems over Rayleigh Fading Channels with NOMA