Bit Error Rate for NOMA Network

Aldababsa, Mahmoud; Goztepe, Caner; Kurt, Güneş Karabulut; Kucur, Oğuz

doi:10.1109/lcomm.2020.2981024

Cited by 79 publications

(51 citation statements)

References 11 publications

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“…The presented expressions are applicable for the two-user NOMA using only binary phase shift keying (BPSK) and QPSK. In [22], the BER for downlink NOMA is derived for any number of users using BPSK. Exact symbol error rate (SER) analysis for NOMA using quadrature amplitude modulation (QAM) is presented in [23], [24].…”

Section: Introductionmentioning

confidence: 99%

Exact Bit Error-Rate Analysis of Two-User NOMA Using QAM With Arbitrary Modulation Orders

et al. 2020

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This letter considers the exact bit error rate (BER) analysis of a two-user non-orthogonal multiple access (NOMA) system using square quadrature amplitude modulation (QAM). Unlike existing work, no constraints are imposed on the modulation order of the QAM symbols for any user. Closedform expressions are derived for the BER of the successive interference cancellation (SIC) receiver in Raleigh fading channels. The analytical BER results corroborated by Mote Carlo simulation show that the power control becomes challenging for high order QAM. Moreover, the BER of each user is approximately independent of the modulation scheme used by the other user for certain power settings.

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Section: Introductionmentioning

confidence: 99%

Exact Bit Error-Rate Analysis of Two-User NOMA Using QAM With Arbitrary Modulation Orders

et al. 2020

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“…The PCBs were introduced in the literature to ensure fairness between users and to avoid the overlap between the NOMA constellation points [15], [25], [27]. Also, PCB ensures the correct placement of each constellation point with respect to other constellation points to avoid constellation points ambiguity problem.…”

Section: Power Coefficients Bounds Analysismentioning

confidence: 99%

“…Table I shows Λ n and κ n for various modulation orders. The PCB can be derived from (25) and it is given as…”

Section: A N = 2 Casementioning

confidence: 99%

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Exact BER Analysis of NOMA with Arbitrary Number of Users and Modulation Orders

Yahya¹,

Alsusa²,

Al-Dweik³

2021

Preprint

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<div>Non-orthogonal multiple access (NOMA) is considered a promising candidate for future mobile networks due to its ability to provide improved spectral-efficiency, massive connectivity and low latency. As such, studying the bit error rate (BER) performance of NOMA is crucial, particularly as its BER performance depends on the power assignment for each user. Therefore, this paper derives exact BER expressions under additive white Gaussian noise (AWGN) and Rayleigh fading channels for an arbitrary number of NOMA users, where each user employs quadrature amplitude modulation (QAM) with an arbitrary modulation order. Furthermore, the power coefficient bounds (PCB), which ensure fairness between users and solve the constellation points ambiguity problem, are derived for the two and three users NOMA system with arbitrary, but identical, modulation orders. However, the procedure to find these bounds for any modulation orders are exemplified. In addition, this paper finds the optimal power assignment that minimizes the system's average BER for N=2 and 3 users cases. The integrity of the analytical expressions is verified by Monte Carlo simulations, where the results give a valuable insight on the system's BER performance and power assignment granularity. It is shown that the feasible power assignment range becomes significantly small as the modulation order, or the number of users, increases, where the BER performance degrades due to the increased inter-user interference (IUI).</div><div><br></div>

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“…So far, there are also a few works focused on improving the outage security of the TAS in the NOMA networks in [19–21]. Additionally, a few works also study the error rate performance of the NOMA network in [22–29].…”

Section: Introductionmentioning

confidence: 99%

Majority based antenna selection schemes in downlink NOMA network with channel estimation errors and feedback delay

Aldababsa

Kucur

2020

IET Communications

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The antenna selection (AS) in non-orthogonal multiple access (NOMA) networks is still a challenging problem since finding optimal AS solution may not be available for all channel realizations and has quite computational complexity when it exists. For this reason, in this paper, we develop a new suboptimal solution, majority based transmit antenna selection (TAS-maj), with significant reduction in computational complexity. The TAS-maj basically selects the transmit antenna with the majority. It is more efficient when compared to previously proposed suboptimal AS algorithms, namely maxmax-max (A 𝟑 ) and max-min-max (AIA) because these schemes are merely interested in optimizing the performance of the strongest and weakest users, respectively at the price of worse performance for the remaining users. On the other hand, the TAS-maj scheme yields better performance for more than half of mobile users in the NOMA networks. In this paper, we consider a multiple-input multiple-output communication system, where all the nodes are equipped with multi-antenna. Besides the TAS-maj is employed at the base station, a maximal ratio combining (MRC) is also employed at each mobile user in order to achieve superior performance. The impact of the channel estimation errors (CEEs) and feedback delay (FD) on the performance of the TAS-maj/MRC scheme is studied in the NOMA network over Nakagami-m fading channels. The outage behavior of the network is investigated by deriving the exact outage probability (OP) expression in closed-form. In addition, the corresponding upper bound of the OP is obtained in the presence of the CEEs and FD. The OP expression in high signalto-noise ratio region is also provided to illustrate an error floor value in the presence of the CEEs and FD as well as diversity and array gains in the absence of the CEEs and FD. The analytical results in the presence and absence of the CEEs and FD are verified by the Monte Carlo simulations. The numerical results imply that the system performance is more sensitive to the CEE than FD and shows the superiority of the proposed TAS-maj/MRC scheme over both A 𝟑 /MRC and AIA/MRC schemes.

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Bit Error Rate for NOMA Network

Cited by 79 publications

References 11 publications

Exact Bit Error-Rate Analysis of Two-User NOMA Using QAM With Arbitrary Modulation Orders

Exact Bit Error-Rate Analysis of Two-User NOMA Using QAM With Arbitrary Modulation Orders

Exact BER Analysis of NOMA with Arbitrary Number of Users and Modulation Orders

Majority based antenna selection schemes in downlink NOMA network with channel estimation errors and feedback delay

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