Low-Power Communication Signal Enhancement Method of Internet of Things Based on Nonlocal Mean Denoising

Table 1

Time costs of signal enhancement by different methods.

Number of signals/piece	Paper method	Reference [7] method	Reference [8] method
1000	0.2	9.2	6.9
1500	0.8	16.2	15.2
2000	0.9	19.9	19.5
2500	1.2	22.6	23.1
3000	1.8	26.9	28.6
3500	2.0	32.1	33.0
4000	2.2	38.9	38.6
4500	2.3	42.9	40.8
5000	2.6	46.8	45.9