Intelligent Automation & Soft Computing DOI:10.32604/iasc.2021.015793 | |

Article |

PTS-PAPR Reduction Technique for 5G Advanced Waveforms Using BFO Algorithm

1Department of Electronics and Communication Engineering, JECRC University, Jaipur 303905, India

2Institute of Research and Development, Duy Tan University, Danang550000, Vietnam

3Faculty of Information Technology, Duy Tan University, Danang550000, Vietnam

4Department of Mechanical Engineering, College of Engineering, Taif University, P. O. Box 11099, Taif21944, Saudi Arabia

*Corresponding Author: Dac-Nhuong Le. Email: ledacnhuong@duytan.edu.vn

Received: 01 December 2020; Accepted: 02 January 2021

Abstract: Non-orthogonal multiple access (NOMA) will play an imperative part in an advanced 5G radio arrangement, owing to its numerous benefits such as improved spectrum adeptness, fast data rate, truncated spectrum leakage, and, so on. So far, NOMA undergoes from peak to average power ratio (PAPR) problem, which shrinks the throughput of the scheme. In this article, we propose a hybrid method, centered on the combination of advanced Partial transmission sequence (PTS), Selective mapping (SLM), and bacteria foraging optimization (BFO), known as PTS-BFO and SLM-PTS. PTS and SLM are utilized at the sender side and divide the NOMA into several sub-blocks. An optimal phase factor is achieved by the BFA and combined with the NOMA sub-block, where a low peak power value is obtained. Further, we estimate the bit error rate (BER) and PAPR of BFA in the SLM and PTS technique. The simulation outputs reveal that the PTS-BFO outperforms the traditional peak power minimization approaches and moderates the complexity of the system. It is concluded that the proposed algorithm is not explored for the NOMA waveform.

Keywords: 5G; non-orthogonal multiple access (NOMA); peak to average power ratio (PAPR); partial transmission sequence (PTS); bacterial foraging optimization (BFO)

Orthogonal frequency division multiplexing (OFDM) is currently employed in 4G radio, but it is not considered for the 5G radio system due to its several disadvantages mentioned in [1–3]. FBMC is one of the best standard advanced wave form schemes that can be envisaged for 5G radio. The NOMA is one of the most promising advances for the state-of-the-art portable matching framework because of its efficient transmission capacity. One of the most significant qualities of NOMA is the use of power space to understand numerous inputs simultaneously [4]. Accordingly, it is prescribed to utilize Successive Interference cancelation method (SIC) at the sender side to upgrade the exhibition of the framework. NOMA likewise expands the limit of the 5G organize a framework allowing a few client gadgets to share indistinguishable assets. The efficiency of NOMA with versatile power portion is examined [5]. The investigation results uncover that the limit of the framework dependent on NOMA is 70% more prominent than the OFDM framework. Nevertheless, there are some obstacles in the NOMA [6,7].

The PAPR is among the few obstacles to its regularization. PAPR hampers the exhibition of the framework because the usage of the OFDM transmission conspires at the sender of the framework PAPR is regarded as one of the significant concerns in designing the FBMC framework. An escalation in PAPR decreases the excellence of the system by increasing the PAPR and bit error rate (BER) of FBMC. The design of FBMC is built in filters; Inverse Fast Fourier transforms (IFFTs) and, FFTs. The cluster of filters reduces the spectrum outflow and improves the bandwidth shaping [8,9]. BFA is regarded as the latest developments optimizer algorithm, centered on the rummage behavior of the E. coli bacteria. The principal persistence of BFA is to produce a perfect phase factor for SLM [10]. The authors of [11] described that the FBMC waveform cannot employ OFDM's conservative PAPR practices because of its uncommon configuration.

In [12], a hybrid system grounded on SLM and circular transformation (CT) is considered for the advanced waveform. The simulation fallouts show an enhanced PAPR enactment, while an upsurge in the BER factor is observed. In [13], the Genetic algorithm-bilayer partial transmission sequence (GA-BPTS) is implemented for FBMC. The unitary layer of the PTS is converted to double-layered and phase factor is derived from GA, which optimized the peak power of the structure. The bit error rate (BER) execution of the framework is improved by spreading the sign over the whole range. Also, PAPR is decreased by executing a network pre-coding pinnacle control decrease method [14]. The work in [15] proposed a survey of future generation wireless communication systems, dynamic spectrum access, and CRN, which contain many spectrum sensing methods for CRN. This improves dynamic spectrum usage and minimizes intrusion for authorized users. The best possible solutions for multiple-band joint detection are analyzed in a practical environment. An experimental result reveals that prediction spectrum detection techniques can significantly improve system efficiency. The work in [16] gave their contemplations towards range seeing in the advanced radio. Architects advance the synergistic vision system through the introduction of importance and NOMA. The results of the reconstruction and examination indicate that the system can reasonably update the probability of opening the range of vision. A sincere and key test of wireless systems is to offer the cell some assistance with edging profit, execution, and ampleness and attract multi-stream transmissions to cell edge customers. Obstacle engagement systems based on various radio wires and inter-cell coordination are now strongly oriented towards synthesis. In the current work, the NOMA PAPR implementation is explored. In this paper, we propose and demonstrate a novel and suitable method for the NOMA framework relying upon various radio wires at the transmitter of the transmitting module and the recipient. The traditional reduction methods and proposed BFA reduction methods have not been contemplated. Also, it eliminates the problem of adjacent channel interference in the QAM modulated communication system. To the best of our understanding and the work presented, it should be noted that the suggested SLM-BFA and PTS-BFA are not currently under consideration for the NOMA waveform.

In this work, we integrate PTS-BFO and SLM-BFO. Initially, PTS and SLM are applied to the NOMA, and subsequently the BFO phase elements are multiplied by the PTS and SLM-OMA symbols. The diverse combinations of phase factors and sub-blocks are applied to decrease the PAPR of the structure.

The schematic of NOMA is given in Fig. 1.

The NOMA signal can be represented as [17]:

where k = 0, 1, 2…N-1. The Eq. (1) after the PHYDYAS filter can be represented as:

where is the carrier frequency, and is the PHYYDAS filter.

From, Eq. (2), the PAPR of the NOMA signal can be written as:

where E {} is the expected value.

Traditionally, PAPR is defined in terms of dB:

To analyze the effect of the reduction method, it is imperative to evaluate the complementary cumulative distribution function (CCDF) of PAPR. The CCDF of NOMA waveform is presented every bit:

2.1 Bacterial Foraging Optimization Algorithm (BFOA)

BFA is extensively employed as a novel optimization technique. It is based on the nature of E. coli bacteria. It is one of the universally adopted algorithms for analyzing the difficulties that arise in the process of optimizing the real environment [18]. There are three stages to a BFO:

a) Chemotaxis: It is a procedure to perform a run and tumble and final estimates the fitness value of bacterium,

b) Reproduction: It estimates the health position and classifies the bacterium in descending sequence in accordance with the health rank of the bacterium and

c) Termination: It involves eliminating the bacterium that has a poor health [19]. The bacterium with high fitness condition indicates the ideal location in the environment.

In the proposed algorithm, the main concern is to find the ideal value of the phase factor which can be multiplied by the NOMA symbols for an optimal peak power [20]. The schematic of the proposed model is illustrated in Fig. 2.

The objective of the projected work is attained in dualistic phases. In the first stage, the advanced SLM and PTS are used for the NOMA signal. It pursues the division of all sub-blocks. SLM and PTS also upsurge the computational intricacy due to the use of IFFTS. In the second phase, we use a BFA to identify an enhanced phase element for SLM, which reduces the PAPR and system complexity.

The NOMA may be represented by equation [21] as follows:

where b is the sub-blocks and n is the number of sub-carriers. The real and imaginary FBMC symbols for sub-carriers can be expressed as:

A cluster of the filter is applied on Eq. (7), resulting:

is the phase period of the NOMA symbol and r is the characteristic of the filter. The IFFT of is expressed as [22]:

Now, the BFA is applied to obtain an optimal phase sequence for SLM and PTS. The composite phase aspect is expressed as:

where are generated to integrate with SLM. The is characterized in terms of vector U is given as:

The NOMA symbol with BFA optimal phase factor is expressed as:

The preeminent incorporation of with the lowest PAPR is picked as:

From Eq. (13), it is noted that the SLM-PTS-BFO familiarized two crucial constraints U, and b, hence PAPR of the NOMA signal can be diminished by choosing different values of U, and b.

The present work is analyzed by using Matlab-2014. The constraints used in the model are shown in Tab. 1.

In the presented simulation, we have selected N = 256, 64-QAM transmission scheme, PHYDYAS filter with roll-off factor (α = 1), b = 8, 16, 32, U = 2, and 4. The proposed approach is rigorously reviewed with a Matlab-2014. Considering the complexity, the number of multiplications required by the SLM-BFA are in comparison to the SLM [23] (4N2 V + 8V2), where N is total sub-carriers and V is sub-blocks. The multiplications requisite in the PTS-BFA are whereas the PTS and SLM-CT [19] needs 4N (NV+ 2VV, 4 (N + 2V) multiplications and 2 (2N + 2U + 2 × 2UU − V − U), 2N (2NV + U) additions, where V is the sub-blocks, N is the total number of sub-carriers and W and b is phase factors. In terms of complexity, the BFO surpasses conventional techniques. Tab. 1 indicates the constraints utilized in the present computer simulation.

Fig. 3 represents the PAPR performance of SLM-BFO and conventional SLM. The best PAPR performance is accomplished by changing the values of U and b. For the CCDF of 0.1%, the PAPR is reduced to 10 dB, 7.9 dB, 5.8 dB, 5.2 dB, 3.9 dB, 3.1 dB and 2.1 dB for SLM, U = 2 b = 8, U = 2 b = 16, U = 2 b = 32, U = 4 b = 8, U = 4 b = 16 and U = 8 b = 32. It has been established that peak performance can be achieved through two constraints.

Fig. 4. illustrates the BER performance of SLM-BFA and SLM. In order to obtain a BER of 0.010%, the signal to noise ratio (SNR) are 12 dB, 9.7 dB, 8.8 dB, 8.2 dB, 7.2 dB, 5.4 dB and 4.3 dB for SLM, U = 2 b = 8, U = 2 b = 16, U = 2 b = 32, U = 4 b = 8, U = 4 b = 16 and U = 8 b = 32.

The CCDF for NOMA PAPR is illustrated in the Fig. 5. The gain of 17 dB in the PAPR is achieved by the PTS. It is seen that the gain of 4 dB, 37 dB, 44 dB, 63 dB, 68 dB for the diverse value of u and W, respectively. The ideal PAPR performance has resulted in u = 4 and b = 32.

The BER curve is shown in Fig. 6. It is seen that the reduction algorithms obtained a gain of 18 dB, 36 dB, 43 dB, 49 dB, 72 dB, and 79 dB, for diverse ideals of sub-blocks and phase factors, respectively. The best possible PAPR performance is seen for u = 4 and b = 32.

To analyze the throughput of the OFDM and NOMA waveform, the BER performance estimation is shown in Fig. 7. The SNRs of the OFDM and NOMA are 12 dB and 14.5 dB, for BER of 10−3 dB. It indicates that the NOMA obtained a gain of 2.5 dB as compared to the OFDM structure [24]. In addition, the NOMA throughput is improved in an efficient manner by applying a proposed BFO-PTS and BFO-SLM.

The conventional OFDM and proposed NOMA waveform schemes are examined to calculate the peak power performance, indicated in Fig. 8. The CCDF of 10−3 is obtained at the SNR of 10.5 dB and 13.5 dB for the OFDM and NOMA waveform. Hence, it is concluded that the peak power efficiency of NOMA is better than the conventional OFDM structure.

The Power spectrum density (PSD) of NOMA is demonstrated in Fig. 9. It is observed that the out of band spectrum leakage performance of the NOMA waveform is efficient and guarantees the high spectral access of the framework.

In this work, the hybrid PAPR algorithms are implemented for the 256-QAM-NOMA structure. PTS and SLM are regarded as one of the most dynamic methods to decrease the PAPR of the waveforms. It also prompts high computational intricacy. Further, a BFO is implemented to find a suitable phase element for which an optimal PAPR is attained. The conclusions of the simulation reveal that the NOMA with SLM-BFO and PTS-BFO performed better than the traditional PAPR procedures and in particular reduced the complexity of the NOMA structure. In the future, BFA can be combined with a number of advanced PAPR methods for 5G waveform.

Funding Statement: Taif University Researchers Supporting Project number (TURSP-2020/77), Taif university, Taif, Saudi Arabia.

Conflicts of Interest: The authors declare that they have no conflicts of interest to report regarding the present study.

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