Path-selection based adaptive guard interval for TFI-OFDM system

摘要

TFI-OFDM system can achieve an accurate channel identification property with small pilot symbols. However, when the guard interval is longer than the maximum delay spread, the fixed guard interval is inefficient. To mitigate this problem, in this paper, we propose the path-selection based adaptive guard interval for TFI-OFDM system. In the proposed system, the paths that exceeded the threshold which was set to a noise variance, were selected. Moreover, due to the selected large delay path, the proposed system can control the guard interval adaptively. From the simulation results, the proposed adaptive guard interval TFI-OFDM can achieve 7.2% and 3.2% throughput enhancement to compare with the conventional fixed guard interval TFI-OFDM under the 15path and vehicular A channels, respectively.