Abstract
This paper investigates the joint effects of in-phase and quadrature-phase imbalance (IQI) and imperfect successive interference cancellation (ipSIC) on the cooperative Internet of Things (IoT) nonorthogonal multiple access (NOMA) networks where the Nakagami-m fading channel is taken into account. The closed-form expressions of outage probability for the far and near IoT devices are derived to evaluate the outage behaviors. For deeper insights of the performance of the considered system, the approximate outage probability and diversity order in high signal-to-noise ratio (SNR) regime are obtained. In addition, we also analyze the throughput and energy efficiency to characterize the performance of the considered system. The simulation results demonstrate that, compared with IQI, ipSIC has a greater impact on the outage performance for the near-IoT-device of the considered system. Furthermore, we also find that the outage probabilities of IoT devices can be minimized by selecting a specific power allocation scheme.
Highlights
With the development of Internet of Things (IoT), traditional orthogonal multiple access (OMA) can no longer afford massive connections due to its low spectrum utilization [1]
E first time slot e second time slot e near-IoT-device tem are derived by considering in-phase and quadrature-phase imbalance (IQI) at source, relay, and IoT devices; imperfect successive interference cancellation (ipSIC) is taken into account (ii) In order to obtain more insights, the asymptotic outage performance is analyzed
The results show that IQI and ipSIC play negative roles in the considered system performance and the outage performance of the considered system will be greatly improved with the increase of signal-to-noise ratio (SNR)
Summary
With the development of Internet of Things (IoT), traditional orthogonal multiple access (OMA) can no longer afford massive connections due to its low spectrum utilization [1]. The authors in [29] have demonstrated that IQI has negative effects on the NOMA systems and cannot be ignored To solve this problem, authors in [30] studied the impact of IQI on the two-way cooperative AF relay systems and derived the closed-form and asymptotic expressions for the outage probability. (i) The exact outage probability expressions of the nearIoT-device and far-IoT-device of the considered syshSR hSDn hSDf. tem are derived by considering IQI at source, relay, and IoT devices; ipSIC is taken into account (ii) In order to obtain more insights, the asymptotic outage performance is analyzed. E1⁄2· denotes the expectation operator; f Xð·Þ and FXð·Þ are the probability density function (PDF) and the cumulative distribution function (CDF) of a random variable X, respectively; Γð·Þ is the Gamma function; Pr ð·Þ represents the probability of a random variable; Kvð·Þ symbolizes the vth-order modified Bessel function of the second kind, and ≜ stands for the definition operator
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