Channel Impulse Response Detection Algorithm for OFDM System

A detection algorithm based on dual-sliding-window is proposed for the detection of channel impulse response (CIR). In OFDM systems with coherent demodulation, the precision of channel estimation has a significant impact on the performance of receivers. However, traditional threshold detection algorithms adopted by time domain channel estimation of OFDM systems is sensitive to noise. In the presence of low-level CIR components, false detection and miss detection occur frequently if the traditional method is adopted, resulting in an inevitable precision loss. According to the cause and the characteristic of low-level CIR, an improved robust CIR detection algorithm is derived in this paper. The detection performance is investigated and simulated. Experimental results verified the theoretical analysis and the validity of the proposed scheme.