Interleave Division Multiple Access (IDMA) is a recently proposed multiple access technique with potential applications in 5G and 6G communication systems. In this study, the wireless communication channel is modeled as an Additive White Gaussian Noise (AWGN) channel, which serves as a widely accepted theoretical framework for evaluating the performance of digital modulation schemes under noise conditions. Phase-Shift Keying (PSK) provides higher bandwidth efficiency and supports higher data rates, whereas Frequency-Shift Keying (FSK) offers superior noise immunity, making it suitable for operation in noisy environments. When integrated with an interleaver, the IDMA system employing both PSK and FSK modulation schemes demonstrates significantly improved performance. In this paper, the performance of the IDMA system has been compared using BPSK and BFSK modulation schemes with both prime and tree interleavers. The Bit Error Rate (BER) is evaluated by varying the Signal-to-Noise Ratio (SNR), and the results are thoroughly analyzed. The complete IDMA system is simulated using MATLAB..
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