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Journal : ITEj (Information Technology Engineering Journals)

Performance Evaluation of Modulation and Power Allocation Effects on BER in NOMA with SIC over AWGN Channels Apriliani, Defina; Soim, Sopian; Sholihin, Sholihin
ITEJ (Information Technology Engineering Journals) Vol 11 No 1 (2026): In Progress
Publisher : Pusat Teknologi Informasi dan Pangkalan Data IAIN Syekh Nurjati Cirebon

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24235/itej.v11i1.257

Abstract

This study evaluates the performance of a Non-Orthogonal Multiple Access (NOMA) system implementing Successive Interference Cancellation (SIC) over Additive White Gaussian Noise (AWGN) channels, focusing on the effects of modulation schemes and power allocation on Bit Error Rate (BER). Three modulation schemes BPSK, QPSK, and 16QAM are studied in combination with different power allocation configurations (e.g., α = 0.1, 0.3) for two users in an OFDM-based NOMA downlink scenario. The signal superposition process is performed at the transmitter side, while SIC is applied at the receiver side to separate the user signals. The simulation results show that the BER performance is greatly affected by the modulation level and power allocation ratio. Lower-order modulations (such as BPSK and QPSK) provide better performance at low SNR, especially for users with poorer channel quality. On the other hand, improper power distribution can cause error propagation in the SIC process, degrading the demodulation accuracy. This study emphasizes the importance of selecting adaptive modulation schemes and power allocation strategies in NOMA system design. These findings provide important contributions to the development of future wireless communication systems, especially 5G and later generations, which demand high spectral efficiency and multi-user service reliability.
Co-Authors Abal, Hubertus Abd Haris, Abd Achmad Efendi Achmad Udin Zailani Ade Wasti, Ade Adewasti, Adewasti Adewasti, Adewasti Al Himam, Wasik Alfurqon, Kharisma Choirunisa Ali Amran Ali Nurdin Ali Syahbana Ali, Rizkia Salsabila Alvino Octaviano Amanda, Lavenia Megy Andika, Jaya Dwi Anggih Tri Cahyadi Anggraini, Leni Ani Firda, Ani APRILIANI, DEFINA Arifanti, Anggita Dwi Arifuddin, Y. Waliyyun Aris Wibowo Asyraf, Muhammad Irfan Mishbahuddin Atik Pramesti Wilujeng, Atik Pramesti Azzahrah, Ladysa Betty Erda Yoelianita Budi, Yulifah Salistia Damayanti, Fransiska Erna Diniati, Dian Luvi Eka Susanti Emilia Hesti Ervia Toga Firmanti, Tria Anisa Fitri Yani Fitria, Yaumul Fitriah, Rahmatul Fransisca Retno Asih Ginting, Bersiap Haerunnisa Haerunnisa, Haerunnisa Haerunnisah, Haerunnisah Ibrahim, Ferbian Ikhsan, Maulana Malik Indah Dwi Lestari Indriani, Ninis Irma Salamah irsyad, irsyad Iswahyudi, Ulul Azmi Izzah, Ukhtul Koyimah, Koyimah Kusumawati, Diana Lafiya, Rifdatul Lestari, Khotifah Puji Liamsi, Heri Lindawati Lindawati Lubna Lubna Lusiyani, Eka Muh. Azis Albar J. Muhammad Al Amin Mujur Rose, Martinus Nani Nani Ningsi, Fitri Noviati, wiwi Nuhardin, Irhamni Nurjaya2, Nurjaya2 Nurmayanti, Anggi Indah Nurudin Nurudin Prasetyawan, Riyan Dwi Putri, Novita Surya Rahman, Asri Ramdhayani, Eryuni Ramli Ramli Rashid, Salman Rizky, Putri Alifia Rudiyanto Rudiyanto, Rudiyanto Salsabila, Shabrina Zhafira Samsudin Samsudin Saparudin, Mohamad Gusmil Sapta Grahadi Wintang, I Wayan Saputra, Ananda Saputro, Bayu Trio Saputro, Rizky Wahyu Sari, Ayu Dwi Ratna Sarjana Sarjana Satrianto, Anang Siswandi Siswandi, Siswandi Siti Nurjanah Sopian Soim, Sopian Subianto, Cahyo Bayu Sultan, Jumriani Supardi Supardi Supriyanto Supriyanto suzan zefi syafitri, kurnia Syafruddin Syafruddin Syafrurrahman, Syafrurrahman Tamaulina Br Sembiring Toga, Erik Turrahmah, Annisa Ulyasari, Nur Wardani, Oktoviani Trisunu Winnugroho Wiratman, Manfaluthy Hakim, Tiara Aninditha, Aru W. Sudoyo, Joedo Prihartono Wulan Agustin, Sindi Candra Yuliyasari, Ricka Ayu