MSNRMaximal Signal-to-Noise Ratio
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As shown in Figure 3, we changed [alpha] value from 1 to 2 and calculated the improvement of MSNR and the correlation coefficient in the corresponding MSNR value (MSNR = -15, -10 dB) obtained with our method, ARX and LMS-RBFNN.
The improvement of MSNR and the correlation coefficient of our method, ARX and LMS-RBFNN in three alpha values (alpha = 1, 1.5, and 2), are shown in Figure 4.
Figure 5(a) shows the stimulated EP and the accordingly observed signals which are the mixture of the stimulated EP and [alpha]-stable distribution noise by MSNR = -7 dB.
Caption: Figure 2: Single-trial EPs s(t, m = 15,10,5, -5) with MSNR = -7 dB estimated using our method.
We compared MAPD with the case without new APs (called NoNewAP), MSD [20], MNSF [19] and MSNR [22].
Table 3 shows that the mean location error by MAPD is 1.56 meter which is 0.56 meter (26%) 0.17 meter (10%), 0.13 meter (7%), and 0.18 meter (10%) smaller than their counterparts by NoNewAP, MSD, MNSF, and MSNR, respectively.
Also, it is seen that MSD, MNSF and MSNR have similar performance.
Finally, it is interesting to note that for 16-QAM modulation and five allocated subcarriers per MS, then as it can be observed from Figures 6 and 7, the MSNR strategy outperforms the AS-MSNR and AS-MSJNR strategies.