Characteristics Analysis of Joint Acoustic Echo and Noise Suppression in Periodic Drillstring Waveguide

Table 2

The average BER for three basic modes of modulation.

Boundary condition	ASK	FSK	PSK
Without acoustic isolator and noise 𝑛𝑑(𝑡)	4%	2.2%	0.8%
Without acoustic isolator but considering the noise 𝑛𝑑(𝑡)	17.6%	17.2%	4%
Considering acoustic isolator and the noise 𝑛𝑑(𝑡)	6.4%	7%	0.6%