Table 11.

Studies with orientation-independent activity recognition. OI-F, orientation-independent features; OI-ST orientation-independent signal transformation.

Study	Methods Used for Orientation-Independent Online Activity Recognition	Used Sensors
[32]	OI-F	A, GPS
[51]	OI-F	A
[36]	OI-ST	A
[60]	OI-Training	A
[59]	OI-ST + OI-F	A
[52]	OI-F	A
[33]	OI-ST	A
[39]	OI-F	A
[53]	OI-ST	A