Abstract
The non-regenerative massive multi-input-multi-output (MIMO) non-orthogonal multiple access (NOMA) relay systems are introduced in this paper. The NOMA is invoked with a superposition coding technique at the transmitter and successive interference cancellation (SIC) technique at the receiver. In addition, a maximum mean square error-SIC receiver design is adopted. With the aid of deterministic equivalent and matrix analysis tools, a closed-form expression of the signal to interference plus noise ratio (SINR) is derived. To characterize the performance of the considered systems, closed-form expressions of the capacity and sum rate are further obtained based on the derived SINR expression. Insights from the derived analytical results demonstrate that the ratio between the transmitter antenna number and the relay number is a dominate factor of the system performance. Afterward, the correctness of the derived expressions are verified by the Monte Carlo simulations with numerical results. Simulation results also illustrate that: 1) the transmitter antenna, averaged power value, and user number display the positive correlations on the capacity and sum rate performances, whereas the relay number displays a negative correlation on the performance and 2) the combined massive-MIMO-NOMA scheme is capable of achieving higher capacity performance compared with the conventional MIMO-NOMA, relay-assisted NOMA, and massive-MIMO orthogonal multiple access (OMA) scheme.
Highlights
F IFTH generation (5G) is brought up to tumble down the explosive increasing number of devices accessing to the internet [1]–[3]
We propose a novel non-regenerative massive-MIMONOMA relay system model
The analytical results are compared with the simulation results of the non-regenerative massive-MIMO-non-orthogonal multiple access (NOMA) relay systems here
Summary
F IFTH generation (5G) is brought up to tumble down the explosive increasing number of devices accessing to the internet [1]–[3]. Besides the prior key technologies with massive multi-input-multi-output (MIMO) [6], [7], small cell [2] and heterogeneous networks (HetNets) [5], non-orthogonal multiple access (NOMA) has received various attentions both in academia and industry for its SE performance merits [8]–[10]. The two user scenario was propounded to compare with the orthogonal frequency division multiple access (OFDMA) [14]; it was proved that with equal power allocation, NOMA can achieve about 48% corresponding gain compared to OFDMA. The relay assisted NOMA systems’ resource allocation problem was investigated in the study of [37], where the proposed matching algorithm can provide sub-optimal solution within an affordable time. The adaptive transmission with buffer assisted NOMA relaying system was proposed in [38], where with the introduced optimal mode selection mechanism, the system throughput was improved
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