Abstract
This paper presents a Generalized Power Allocation (GPA) scheme for different users in Non-Orthogonal
Multiple Access (NOMA) based wireless communication system. The power allocation to the users becomes
complex with the increased number of users. There are some conventional schemes for power allocation in
NOMA but they have to optimize some parameters arbitrarily. In this paper, a simple but effective power
allocation scheme has been formulated and tested by simulations. The proposed GPA scheme does not need
any parameter adjustment. Theoretical power distribution to different users of NOMA has been calculated
using the proposed GPA technique. The calculated powers of individual users with the proposed scheme
are different and more distributed than the arbitrary power allocation scheme which satisfies the basic
condition of NOMA. The total of calculated powers with GPA scheme shows only 01% variation with the
arbitrary power allocation scheme which shows the consistency of GPA scheme with other schemes. The
performance of NOMA based wireless communication system with GPA scheme has been simulated under
various conditions using Matlab. The simulated BER performance for NOMA based wireless
communication system using different modulation techniques show similar results with other conventional
schemes which validates the formulation of GPA scheme.
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