Abstract
The fourth Industrial Revolution is expected to lead to an era of technological innovation and digitization that would require connectivity by the users, anywhere and anytime. The fifth generation of wireless communication systems and the technologies therein are being explored to cater to high connectivity needs that encompass high data rates, very low latencies, energy‐efficient systems, etc. A multiuser environment is anticipated that would require multiple access techniques, such as Nonorthogonal Multiple Access (NOMA). The user data in the power domain NOMA is superimposed, at the transmitter base station, which is in turn subjected to Successive Interference Cancellation at the user end. In the multiuser downlink, the desired user’s signal is subjected to imperfect SIC due to incomplete cancellation of the undesired user’s signal. Pulse‐shaping of NOMA symbols using wavelet transform is proposed to mitigate the multiuser interference due to imperfect SIC. Closed‐form symbol error rate (SER) expression is derived for the wavelet NOMA system for a three‐user scenario. Analytical results show that wavelet transform pulse‐shaped NOMA performs better compared to Fourier transform pulse‐shaped NOMA symbols in mitigating SIC and thereby minimize the residual error due to imperfect SIC.
Highlights
The number of wireless devices connected to the network is growing to billions, and the fifth-generation mobile communication networks (5G) is envisaged to cater to massive connectivity, high data rate with high reliability [1]
The authors presented the work including mathematical analysis of three users for Nonorthogonal Multiple Access (NOMA) system under imperfect successive interference cancellation (SIC) constraint and preference is given to the numerical results
At 0 dB, the residual error value for User 3 is 0.0565 that is the minimum compared to the User 2 for Fast Fourier Transform (FFT)-NOMA, while for User 2, the error value at 0 dB is 0.0781 that is a bit higher than the User 3 because of the placement of it is near to the base station
Summary
The number of wireless devices connected to the network is growing to billions, and the fifth-generation mobile communication networks (5G) is envisaged to cater to massive connectivity, high data rate with high reliability [1]. Most of the data traffic from mobile subscribers is video streaming that requires higher bandwidth and lower latency. These requirements call for an upgrade of current mobile communication networks. NOMA is considered a promising multiple access technique to boost the current wireless communication network. NOMA allows the optimization of multiuser operation and allocates the same frequency resources to all the users in the downlink, where no spatial separation is needed. This can be achieved by using a superposition technique [5]. Successive interference cancellation (SIC) is applied to retrieve a signal
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
