I. Introduction
With the development of medical technology and the increment of the elderly population, there will be tremendous growth in the healthcare monitoring markets, such as exercise monitor, health monitor for eldly people and remote patient monitoring. Patients and the aged will benefit from continuous monitoring of their diagnostic procedures. These applications can be integrated into wireless body area networks (WBANs) for health monitoring. A typical WBAN topology consists of a series of miniature invasive/non-invasive physiological sensors and is able to communicate with other nodes or with a central node [1]. Many publications have been reported about the WBAN applications for medical diagnosis, especially electrocardiography (ECG) monitoring system [2] [3] [4].