Multiple-Echo Suppression Modeling and Experimental Verification for Acoustic Transmission along Periodic Drillstring Using Dual Receivers

Table 4

The measured average BER for three basic modes of modulation at different rotation speeds.

Rotation speed (r/min)	Modulation	Single receiver	Dual receiver
0	ASK	3.8%	2.2%
0	FSK	2.8%	2.0%
0	PSK	2.6%	1.6%
80	ASK	15.0%	5.2%
80	FSK	13.6%	3.8%
80	PSK	21.2%	8.2%
140	ASK	22.8%	8.6%
140	FSK	16.2%	6.2%
140	PSK	32.0%	12.2%