LUTHFI ALFAJRI ZANIL, - (2024) PERFORMANCE EVALUATION OF DFE EQUALIZER ACROSS THREE REGIONS AND IONOSPHERIC CHANNEL CONDITIONS AS PER ITU STANDARDS. ICTECA (International Conference on, Technology, Engineering, and Computing Applications).

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Abstract

The advancement of technology has broadened the utilization of frequencies, significantly enhancing communication range. Among these frequencies, high frequency (HF) is frequently employed, particularly in conjunction with the ionospheric layer. However, practical applications often encounter challenges, notably the delay spread phenomenon caused by multipath propagation, which distorts signals at the receiver. This distortion contributes to a cascade of issues, including elevated Bit Error Rate (BER) values. To mitigate this problem, it is essential to implement methods that effectively reduce the high BER resulting from delays caused by multipath objects. One promising approach involves the application of equalization techniques, specifically the Decision Feedback Equalizer (DFE). This research aims to analyze the performance of a DFE equalizer for three regions and three ionospheric channel conditions based on ITU standards. Additionally, it examines the performance of the DFE equalizer under these conditions using simulations conducted in the MATLAB application. The findings show that the decision feedback equalizer significantly improves the performance of highfrequency (HF) radio communication systems in the Waterson model ionospheric channel. Moreover, the DFE equalizer effectively reduces Inter-Symbol Interference (ISI) and lowers the Bit Error Rate (BER), bringing the BER down to 10-3, compared to the higher BER of 10-1 in systems without the equalizer. This method also successfully mitigates interference caused by ionospheric channel fluctuations.

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