An Indoor Optical Wireless System Dedicated to Healthcare Using QPSK Modulation

In this paper, Indoor optical wireless infrared (IR) technology has been investigated for wireless health care monitoring of patient in the hospital environments. Monitoring provides the continuous measurement of vital sign to secure the patient in hospital. For the purpose of movement of patient we concentrate on most simplest mobile IR type i.e. LOS (line of sight) propagation method with an QPSK (quadrature phase shift keying) modulation technique within the hospital room under mobility constraints. A mobile channel model is developed in the hospital room through the study of variation of the distance between transmitter and receiver. We consider two mobility scenarios, one in 2 dimensions (2D) for a fixed transmitter height and another in 3D. In both mobility scenarios, the probability of link failure (Outage Probability) between transmitter and receiver has been calculated with the help of channel gain distribution due to variation on the distance (d) by taking two distribution of the channel, first one is uniform distribution (patient is moving uniformly) and second one is Gaussian distribution. By calculating outage probability the impact of the patient mobility on the quality of services and data rate for a reliable wireless monitoring system has been investigated.