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Non-Orthogonal Multiple Access (NOMA) is emerging as a capable aspirant for fifth-generation (5G) technology. High spectral efficiency and massive connectivity demands are satisfied by NOMA along with Orthogonal Frequency Division Multiplexing (OFDM). In this article, we describe the NOMA technique with the OFDM channel selection technique. The source signal is modulated by Quadrature Amplitude Modulation (QAM) and encoded by the fast Fourier Transform (FFT) encoder. The transmitted signal is transferred under the optimal power allocation using the firefly optimization algorithm in the OFDM NOMA technique. The fitness function is derived with power constraint and is optimized using the firefly optimization algorithm. The performance parameters of the suggested scheme are Signal to Noise Ratio (SNR), Bit Error Rate (BER), Spectrum Efficiency (SE), and Energy Efficiency (EE) which are computed and attain better outcomes when compared with the traditional OFDM technique along with Orthogonal Multiple Access technique (OMA).

Optimal Power Allocation Based on OFDM-NOMA Network Using Firefly Optimization