Abstract
One of promising applications for implant communications is a wireless capsule endoscope, which can realise a high quality of medical and healthcare services. However, the regulation of medical implant communication service (MICS) band often employed by the wireless capsule endoscope prevents reliable and high-speed transmission due to its narrowband limitation. In this study, the authors introduce several multilevel modulation schemes with local frequency offset diversity reception into the implant communications to improve the communication reliability and the data rate without any frequency bandwidth extension. Then, the authors evaluate the throughput performances for the proposed multilevel modulation with spatial diversity reception based on propagation characteristics of implant wireless signals derived by a finite difference time domain analysis. Consequently, the computer simulation results demonstrate that the proposed implant communication system can accomplish maximum communication distance of 20 cm ensuring excellently high throughput of 1.5 Mbps under the MICS bandwidth limitation of 300 kHz in a realistic implant communication scenario.
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