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Fig. 6: Outage probability of 3 users – Near User is a
cooperative Relay.
It’s clear that in Fig. 7 the fluctuation of the instantaneous
values of the near and middle users’ achievable rate. It is
always higher than the target rate, as well as the stability of
the value of the far user’s achievable rate above the threshold
target rate despite its low value, which gives the continuity
working of the three users without outage. The middle user
outperforms the far user in terms of throughputs due to the
channel's strength, proximity to the relay, and absence of
interference.
Fig. 7: Instantaneous Achievable Rates bit/s/Hz with
NOMA cooperative Un relay.
IV. CONCLUSION
In this paper, a framework has been proposed to increase
the area of the spectrum while increasing energy efficiency,
based on the principle of the power allocation between users
by using the NOMA technology, as well as relying on the
principle of cooperation and increasing energy using one of
the green energy methods. The system's performance is
analyzed using the achievable data rates and the outage
probability.
A model has a barrier between the second and third users
with absence of a link between them and the base station.
The first user acts as a signal relay for the other users, they
will be entered into the work and the cooperation will
increase the achievable data rate values from zero to (a value
ranging 7.57 bps/Hz to 12.55 bps/Hz) and (1,292 bps/Hz),
respectively, at transmitting power ranging from zero to 30
dBm. The first user’s achievable data rate has been reduced
by half due to the relying, these values make all users
working without outage, thus increasing the throughput,
Msayer, Swadi, & AlSabbagh
spectrum efficiency, and reliability of all users of the
proposed system.
CONFLICT OF INTEREST
The authors have no conflict of relevant interest to this
article.
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