The most challenging aspects for wireless medical devices on patients are:

• Low-Power for long lifetime
• Long-Range for mobility and daily use
• Interference robustness for all-time reliability

To assist physicians in hospitals and operating rooms efficiently and effectively with wireless equipment, device communication must be reliable and easily accessible. Devices can be buried under a pile of other equipment, contain metal, or other electrical components, which result in rich multipath, interference, and shadowed propagation of the radio waves. This requires wireless communication under large interference and low SNR.