Figure 4
From: A polarity comparison timing synchronization estimation for MB-OFDM-based UWB systems
Correlation difference output for preamble 1 (or equivalently 2). (A) CM1, SNR = 10 dB. (B) CM1 noiseless. (C) CM2, SNR = 10 dB. (D). CM2, noiseless. The received timing index varies from 0 to 1000. The real blue lines in figures are the correlation difference operation results of adjacent received symbols, and the dotted red lines show the exact timing index. The meanings of different lines of Figure 5 are the same as this figure.