Experimental Validation of Non-Orthogonal Multiple Access (NOMA) Technique using Software Defined Radio
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Experimental Validation of Non‑Orthogonal Multiple Access (NOMA) Technique using Software Defined Radio Bathula Siva Kumar Reddy1 Accepted: 29 October 2020 © Springer Science+Business Media, LLC, part of Springer Nature 2020
Abstract For last few years, the usage of bandwidth is being increased rapidly due to the growth of advanced applications and services. Therefore, it is required to depend on various multiple access techniques to maximize the spectrum efficiency. Non-orthogonal multiple access (NOMA) is recognized as a prominent technique to increase the spectrum utilization for upcoming wireless technologies. In this paper, the experimental validation of NOMA system is carried out with the help of software defined radio testbed by considering 4 users maintaining various distances from the base station. The necessity of successive interference cancellation (SIC) for NOMA is tested experimentally and results are presented. Obtained results show that the NOMA system has a better improvement in terms of bit error rate after applying SIC. Keywords GNU radio · NOMA · OFDMA · SDR · USRP
1 Introduction During the several decades, wireless communication brought a revolutionary changes in technology such as 1G, 2G, 3G and 4G. In all the generations, especially multiple access techniques [1–5] played an important role to provide possible best services. Recently, NOMA has turned in to an essential multiple access technology for 5G to achieve better spectral efficiency, massive connectivity for Internet of Technology (IoT), high connectivity density and very less latency [6]. Users share the different resources in multiple access techniques, time in TDMA, frequency in FDMA, code in CDMA, orthogonally multiplexed frequency in OFDMA, power in power domain NOMA, pattern in pattern division multiple access (PDMA) [7] and antenna beams in spatial division multiple access (SDMA) [8] (reuses the same set of cell phone frequencies in a given service area), which are shown in Fig. 1. FDMA, TDMA, CDMA and OFDMA techniques are employed in 1G, 2G, 3G and 4G technologies, respectively. OFDMA is used as an important technique in 4G technology due to its multi-user diversity and low receiver complexity. In contrast, the * Bathula Siva Kumar Reddy [email protected] 1
Department of Electronics and Communication Engineering, CMR Engineering College, Hyderabad, Telangana 501401, India
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Fig. 1 Multiple access techniques
number of multiple users are reduced and the orthogonality among the users is frequently disturbed by the channel impairments. Consequently, it became more challenging task to maintain high spectral efficiency, massive connectivity by using orthogonal multiple access (OMA) techniques. Therefore, an innovative concept “NOMA” is proposed where all the users are multiplexed orthogonally in power domain [6]. However, the receiver complexity is increased to separate the users by suppressing the interference. Recently, several NOMA solutions are proposed and these are classified
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