Impact of Non-Linear High Power Amplifiers on Cooperative Relaying Systems

Balti, Elyes; Guizani, Mohsen

doi:10.1109/tcomm.2017.2722499

Cited by 49 publications

(41 citation statements)

References 50 publications

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“…Therefore, studying the impact of NLD on the system performance is important from perspective of system design. Thus, researchers have also observed the impact of NLD on the performance of various cooperative relaying systems [21]- [27].…”

Section: A Related Workmentioning

confidence: 99%

On Performance of Hexagonal, Cross, and Rectangular QAM for Multi-Relay Systems

et al. 2019

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Error performance is considered as one of the most important performance measures, and deriving the closed-form expressions for efficient modulation techniques over generalized fading channels is important for future cellular systems. In this paper, the performance of a dual-hop amplify-and-forward multi-relay system with best relay selection is analyzed over independent and non-identically distributed (i.n.i.d.) Nakagami-m fading links with both integer and non-integer fading parameters. The impact of practical constraints of imperfect channel state information (CSI) and non-linear power amplifier (NLPA) at each of the relays are considered. Closed-form expressions for the outage probability are derived for both integer and non-integer fading parameters, and asymptotic analysis on the outage probability is performed to obtain the diversity order of the considered multi-relay system. Based on the cumulative distribution function approach, average symbol error rate (ASER) expressions for general order hexagonal QAM, general order rectangular QAM, and 32-cross QAM schemes are also derived. The comparative analysis of ASER for various QAM schemes with different constellations is also illustrated. Furthermore, the impact of the number of relays, fading parameter, channel estimation error, and non-linear distortion on the system performance is also highlighted. Finally, the derived analytical results are validated through Monte-Carlo simulations. INDEX TERMS Nakagami-m, multi-relay, imperfect CSI, non-linear power amplifier (NLPA), hexagonal QAM (HQAM), rectangular QAM (RQAM), cross QAM (XQAM).

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Section: A Related Workmentioning

confidence: 99%

On Performance of Hexagonal, Cross, and Rectangular QAM for Multi-Relay Systems

et al. 2019

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“…Unfortunately, in practice, the system performance gets affected by the RF impairments such as high power amplifier (HPA) nonlinearity, in-phase and quadrature-phase (I/Q) imbalance and crosstalk [7,8]. Balti et al [9] have investigated the impact of the nonlinear distortion on multiple relay systems. They have proved that the system performance such as the outage probability, bits error rate (BER) and the ergodic capacity deteriorated compared to the linear HPA.…”

Section: Introductionmentioning

confidence: 99%

Performance Analysis of NOMA in 5G Systems With HPA Nonlinearities

2020

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In this paper, we provide an analytical performance assessment of downlink non-orthogonal multiple access (NOMA) systems over Nakagami-m fading channels in the presence of nonlinear high-power amplifiers (HPAs). By modeling the distortion of the HPA by a nonlinear polynomial model, we evaluate the performance the NOMA scheme in terms of outage probability (OP) and ergodic sum rate. Hence, we derive a new closed-form expression for the exact OP, taking into account the undesirable effects of HPA. Furthermore, to characterize the diversity order of the considered system, the asymptotic OP in the high signal-to-noise (SNR) regime is derived. Moreover, the ergodic sum rate is investigated, resulting in new upper and lower bounds. Our numerical results demonstrate that the performance loss in presence of nonlinear distortions is very substantial at high data rates. In particular, it is proved that in presence of HPA distortion, the ergodic sum rate cannot exceed a determined threshold which limits its performance compared to the ideal hardware case. Monte-Carlo simulations are conducted and their results agree well with the analytical results. INDEX TERMS non-orthogonal multiple access (NOMA), high-power amplifiers (HPA), nonlinear polynomial model, outage probability (OP), ergodic sum rate.

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“…More specifically, in the case of TWTA model, the impairment parameters K and σ 2 NL can be given under the assumption of negligible AM/PM effects by [66,Eq. (11)], [67,Eq. (19)]…”

Section: B Nonlinear Satellite Transpondermentioning

confidence: 99%

Performance of Multibeam Very High Throughput Satellite Systems Based on FSO Feeder Links with HPA Nonlinearity

Zedini¹,

Kammoun²,

Alouini³

2020

Preprint

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Due to recent advances in laser satellite communications technology, free-space optical (FSO) links are presented as an ideal alternative to the conventional radio frequency (RF) feeder links of the geostationary satellite for next generation very high throughput satellite (VHTS) systems. In this paper, we investigate the performance of multibeam VHTS systems that account for nonlinear high power amplifiers at the transparent fixed gain satellite transponder. Specifically, we consider the forward link of such systems, where the RF user link is assumed to follow the shadowed Rician model and the FSO feeder link is modeled by the Gamma-Gamma distribution in the presence of beam wander and pointing errors where it operates under either the intensity modulation with direct detection or the heterodyne detection. Moreover, zero-forcing precoder is employed to mitigate the effect of inter-beam interference caused by the aggressive frequency reuse in the user link. The performance of the system under study is evaluated in terms of the outage probability, the average bit-error rate (BER), and the ergodic capacity that are derived in exact closed-forms in terms of the bivariate Meijer's G function. Simple asymptotic results for the outage probability and the average BER are also obtained at high signal-to-noise ratio.

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Impact of Non-Linear High Power Amplifiers on Cooperative Relaying Systems

Cited by 49 publications

References 50 publications

On Performance of Hexagonal, Cross, and Rectangular QAM for Multi-Relay Systems

On Performance of Hexagonal, Cross, and Rectangular QAM for Multi-Relay Systems

Performance Analysis of NOMA in 5G Systems With HPA Nonlinearities

Performance of Multibeam Very High Throughput Satellite Systems Based on FSO Feeder Links with HPA Nonlinearity

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