Performance Analysis of MIMO-OFDM Systems under Different Modulation Schemes and Channel Conditions Using Various Transform Techniques

MIMO-OFDM, a combination of Multiple Input Multiple Output and Orthogonal FrequencyDivision Multiplexing, offers high data rates and improved spectral efficiency for wirelesscommunications. This study evaluates MIMO-OFDM performance in digital image transmissionusing modulation schemes such as BPSK, QPSK, 16-QAM, 64-QAM, and 128-QAM underAWGN, Rayleigh, and Rician channels. Signal transforms including FFT, DWT, DCT, and DFTare applied to enhance robustness and reduce distortion. System performance is assessed based onBit Error Rate (BER) versus Signal-to-Noise Ratio (SNR). Results show BPSK achieves lowestBER in all conditions, making it ideal for noisy environments, while higher-order QAM schemesyield higher throughput with increased BER at low SNR. DWT-based systems perform best inminimizing BER and preserving image quality. These results highlight the importance of selectingoptimal modulation and transform techniques to balance data rate and reliability. Future work mayexplore adaptive modulation and hybrid transforms to improve performance in dynamicconditions.