Improved OFDM THz Communication System Performance through Noise Suppression and Channel Estimation via Channel Matrix Pruning Technique

Channel estimation is crucial in ensuring the quality of transmitted data in wireless THz communication. To evaluate the performance of different channel estimation techniques, we conducted an experimental transmission of 4 to 64 QAM-OFDM signals using intensity modulation and direct detection methods over a 4.5-meter wireless link distance. Subsequently, we proposed a pruning technique that utilizes only a 1-block type symbol pilot to improve channel estimation. Our results demonstrate that using this technique and 1-block type pilot OFDM symbols leads to better mean square error than utilizing 8-block type pilots when transmitting 64 OFDM data symbols. This highlights the effectiveness of our proposed pruning technique in improving channel estimation for wireless THz communication.