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access icon free Performance analysis of discrete wavelet transform for downlink non-orthogonal multiple access in 5G networks

  • Author(s): Usman Ali 1 ; Sobia Baig 1 ; Tariq Umer 2 ; Zhiguo Ding 3
    • View affiliations
  • Source: Volume 14, Issue 10, 23 June 2020, p. 1666 – 1674
    DOI:  10.1049/iet-com.2019.0851 , Print ISSN 1751-8628, Online ISSN 1751-8636
© The Institution of Engineering and Technology
Received 24/08/2019, Accepted 12/03/2020, Revised 04/02/2020, Published 17/03/2020

Non-orthogonal multiple access (NOMA) has been considered a key technology to address the increasing traffic demands for fifth-generation (5G) cellular wireless communication networks and internet of things. The NOMA technique offers efficient bandwidth utilisation, low latency, and support for the massive connectivity of devices in 5G networks. In the conventional NOMA system, orthogonal frequency division multiplexing (OFDM) is used as a pulse-shaping technique that causes high peak to average power ratio (PAPR) due to the superposition of signals of multiple users after passing through inverse fast Fourier transform and spectral inefficiency due to the cyclic prefix insertion. Therefore, an alternate methodology using wavelet OFDM is proposed in this research work, as a pulse-shaping technique for NOMA-based communication systems to improve spectral efficiency and system capacity The main contribution of this study is the analysis of the bit error rate (BER) performance and the effect of carrier frequency offset on system performance of wavelet NOMA (W-NOMA) technique in 5G networks. The simulation results demonstrate that W-NOMA outperforms the conventional NOMA with reference to PAPR and BER.

Inspec keywords: multi-access systems; 5G mobile communication; OFDM modulation; cellular radio; error statistics; discrete wavelet transforms; fast Fourier transforms

Other keywords: conventional NOMA system; NOMA-based communication systems; spectral inefficiency; high peak to average power ratio; fifth-generation cellular wireless communication networks; system performance; spectral efficiency; orthogonal frequency division multiplexing; efficient bandwidth utilisation; internet of things; system capacity; inverse fast Fourier transform; 5G networks; cyclic prefix insertion; wavelet OFDM; discrete wavelet transform; W-NOMA; performance analysis; pulse-shaping technique; bit error rate performance; traffic demands; wavelet NOMA technique; downlink nonorthogonal multiple access

Subjects: Modulation and coding methods; Mobile radio systems; Multiple access communication; Other topics in statistics; Integral transforms

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