1. Radoš S. Dabić, Nenad S. Jovičić
Wireless Functional Electrical Stimulation System

2. Introduction
FES considers use of electrical charge pulses to stimulate sensory or motor nerves in order to get controlled muscle contraction
Variety of centralized FES systems and stimulators
Distributed FES systems
Flexible
Displaced processing to powerful host computers
Low complexity
Wireless communication
Reliability – minimizing transport delay
Various wireless protocols in use nowadays

3. FES stimulator design Architecture of the system
Block diagram of the stimulator unit
Block diagram of the coordinator unit

4. Testbed Main task – reliability of data transfer
Basic idea – precise bit-rate control at critical points
Variable bit-rate
Transmit power
Combined gives longer range
Design under test:
Transmit power -16dBm
Various bit-rates
RSSI, LQI included
2-FSK signal modulation MSK modulation 250kbps, 500kbps)

5. Testing results (1)

6. Testing results (2)

7. Conclusion
Bit-rate control is of interest for reliable communication in proposed FES system
Precise bit-rate selection in critical situations
Lower bit-rate in order to increase range and throughput of transmission link
RSSI, LQI – help in bit-rate selection

8. THANK YOU FOR YOUR ATTENTION!