100 Training Index Training Index 100 200 300 300 400 400 500 100 300 200 Testing Index (a) 400 500 500 100 300 200 Testing Index (b) 400 500 100 300 200 Testing Index (d) 400 500 100 Training Index 100 Training Index 200 200 300 200 300 400 400 500 100 300 200 Testing Index (c) 400 500 500 1 1 0.98 0.9 True Positive Rate True Positive Rate FIGURE 5. The TRRS matrix under an effective bandwidth of (a) 10 MHz, (b) 40 MHz, (c) 120 MHz, and (d) 360 MHz. 0.96 0.94 0.8 0.7 0.92 0 0.02 0.04 0.06 False-Positive Rate (a) 0.08 0.6 Effective Bandwidth = 40 MHz Effective Bandwidth = 280 MHz 0 0.2 0.4 0.6 False-Positive Rate (b) 0.8 Effective Bandwidth = 160 MHz Effective Bandwidth = 360 MHz FIGURE 6. The ROC curve in the presence of environmental dynamics: (a) dynamics from human movement and (b) dynamics from large object movement [32]. IEEE Signal Processing Magazine | May 2018 | 65