Impact of HPA nonlinearity on the performance of power domain OFDM-NOMA system

Mounir, Mohamed; Mashade, Mohamed B. El; Aboshosha, Ashraf; Youssef, Mohamed

doi:10.1088/2631-8695/ac5aa2

Cited by 5 publications

(6 citation statements)

References 37 publications

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“…Successive interference cancellation (SIC) is used in the receiver (1) k,m are the signal-to-interference-plus-noise ratio (SINR) and the signal-to-noise ratio (SNR) of the mth user over the kth subcarrier, respectively. The first term in the denominator of (4) becomes 0 in γ k,1 , i.e., at NU [8]. Finally, the total sum rate capacity is computed as shown below [8];…”

Section: Ofdm-noma Systemmentioning

confidence: 99%

“…The first term in the denominator of (4) becomes 0 in γ k,1 , i.e., at NU [8]. Finally, the total sum rate capacity is computed as shown below [8];…”

Section: Ofdm-noma Systemmentioning

confidence: 99%

“…IBO is mathematically represented as [40]: where x sat represents the saturation level of the linearized HPA, also called soft limiter (SL). In the presence of nonlinear distortion, the received OFDM-NOMA signal is not the same as in (2); instead, it is modified according to Bussgang theorem as follows [8]:…”

Section: Papr Problem and Nonlinearity In Ofdm-noma Systemmentioning

confidence: 99%

“…This means that the OFDM-NOMA system will exhibit some nonlinear distortion in order to preserve the HPA efficiency. As a result, in order to mitigate the effect of nonlinear distortion, the PAPR of the OFDM-NOMA system must be reduced [8].…”

Section: Introductionmentioning

confidence: 99%

“…Both the polynomial model and the RHI term are insufficient to investigate the effect of the nonlinear HPA on the performance of the OFDM-NOMA system. In contrast, the authors of [8,12,13] used the Bussgang theorem to model HPA. This is a practical HPA model for investigating the impact of IBO on the performance of the OFDM-NOMA system.…”

Section: Introductionmentioning

confidence: 99%

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Low-complexity selective mapping technique for PAPR reduction in downlink power domain OFDM-NOMA

Mounir

Youssef

Aboshosha

2023

EURASIP J. Adv. Signal Process.

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To support ultra-massive connectivity, non-orthogonal multiple access (NOMA) techniques are expected to be used in 6G instead of conventional orthogonal multiple access (OMA) techniques. Furthermore, given that orthogonal frequency division multiplexing (OFDM) was used by 4G and 5G, NOMA is expected to be combined with OFDM to mitigate frequency selectivity in multipath channels. However, after passing through nonlinear high power amplifiers (HPAs), OFDM-NOMA has reportedly suffered from nonlinear distortion due to the high peak-to-average power ratio (PAPR) problem, thus reducing users’ achievable data rates, sum rate capacity, and users’ bit error rate after going through nonlinear HPAs. Many PAPR reduction techniques have been introduced in the literature; however, high PAPR reduction gain comes at the expense of computational complexity. In this paper, a novel selective mapping (SLM) scheme for PAPR reduction in OFDM-NOMA systems is proposed. By utilizing the structure of the OFDM-NOMA transmitter, the proposed SLM scheme achieves the same performance as that of the conventional SLM scheme while requiring less computational complexity.

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Section: Ofdm-noma Systemmentioning

confidence: 99%

“…The first term in the denominator of (4) becomes 0 in γ k,1 , i.e., at NU [8]. Finally, the total sum rate capacity is computed as shown below [8];…”

Section: Ofdm-noma Systemmentioning

confidence: 99%

Section: Papr Problem and Nonlinearity In Ofdm-noma Systemmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Low-complexity selective mapping technique for PAPR reduction in downlink power domain OFDM-NOMA

Mounir

Youssef

Aboshosha

2023

EURASIP J. Adv. Signal Process.

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Reducing peak to average power ratio in optical NOMA based 5G system using advanced SLM method

Kumar,

Chakravarty,

Nanthaamornphong

2024

Opt Quant Electron

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Optimizing PAPR, BER, and PSD Efficiency: Using Phase Factors Generated by Bacteria Foraging Algorithm for PTS and SLM Methods

Kumar,

Gaur,

Nanthaamornphong

2024

IEEE Access

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The orthogonal time-frequency space (OTFS) waveform is a modulation scheme for wireless communication that achieves high spectral efficiency by exploiting multipath propagation, offering robustness to Doppler shifts and delay spread. A high peak-to-average power ratio (PAPR) is considered to be a significant issue in the OTFS waveform, drastically reducing the performance of the framework. PAPR affects system performance by causing power amplifiers to operate inefficiently at high power levels, leading to increased power consumption, distortion, and reduced spectral efficiency. In this study, we combined the partial transmission sequence (PTS) and selective mapping (SLM) with the bacterial foraging algorithm (BFA), which is also known as the SLM-BFA and PTS-BFA. An extensive search for the optimal phase factors in the PTS and SLM can be computationally expensive. BFO mimics the foraging behavior of bacteria to efficiently navigate the search space. BFO intelligently finds the optimal phase factors, reducing the computation and PAPR values of the OTFS. The performance of the proposed hybrid schemes was simulated for Rayleigh and Rician channels for 64 and 256 subcarriers, respectively. Parameters such as PAPR, bit error rate (BER), and power spectral density (PSD) were analyzed and compared with those of conventional SLM and PTS methods. The projected hybrid methods obtained a significant PAPR gain of 7.9 and 11.9 dB for 64 subcarriers and 7.5 dB and 8.9 dB for 256 subcarriers with Rayleigh and Rician channels, respectively. Further, it is seen that the proposed methods effectively retained the BER performance of the framework with trivial intricacy. In conclusion, using PTS and SLM techniques, which have been improved by the BFA, makes OTFS waveform communication systems work better. These methods effectively mitigate the PAPR issue and improve the system efficiency and spectral utilization. The synergy between the PTS, SLM, and BFA offers a promising approach for overcoming the challenges in OTFS modulation, contributing to the advancement of robust and efficient wireless communication technologies.

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Impact of HPA nonlinearity on the performance of power domain OFDM-NOMA system

Cited by 5 publications

References 37 publications

Low-complexity selective mapping technique for PAPR reduction in downlink power domain OFDM-NOMA

Low-complexity selective mapping technique for PAPR reduction in downlink power domain OFDM-NOMA

Reducing peak to average power ratio in optical NOMA based 5G system using advanced SLM method

Optimizing PAPR, BER, and PSD Efficiency: Using Phase Factors Generated by Bacteria Foraging Algorithm for PTS and SLM Methods

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