Abstract
Selection of the most energy-efficient modulation scheme is vital for wireless body area networks (WBANs) for improving the network lifetime. In this paper, we investigate the performance of various modulation schemes specified by IEEE 802.15.6 WBAN standard, in terms of energy consumed for successfully transferring one packet from the sensor node to the hub. Assuming a contention-free MAC protocol, we present an analytical model for computing the energy consumption for a given modulation scheme both for uncoded transmission as well as transmission using Bose-Chaudhuri-Hocquengham (BCH) codes; the coding scheme specified by IEEE 802.15.6 for WBAN. The following communication scenarios specific to a WBAN are considered: (i) in-body communication between invasive devices and hub and (ii) on-body communication among non-invasive devices and hub with line-of-sight (LOS) and non-LOS (NLOS) channels. The results show that the use of higher order differential phase shift keying (D8PSK)-based modulation schemes results in significant reduction of total energy consumption. When BCH codes with various code rate specifications are used, total energy consumption remains lower for the higher order modulation schemes. The energy consumption is further reduced when non-coherent frequency shift keying (NC-MFSK) is employed as an alternate modulation scheme instead of differential PSK schemes.
Highlights
1 Introduction Wireless body area networks (WBANs) consist of a number of low-power sensor nodes that are attached to the body surface, implanted inside or around the body, that monitor vital physiological parameters and transmit the data to a central device known as hub
The major contributions of our paper are as follows: We investigate the performance of different modulation schemes for IEEE 802.15.6-complaint WBAN
3 Results and discussions we evaluate the energy consumed by various modulation schemes in the context of WBAN narrow band physical layer
Summary
Wireless body area networks (WBANs) consist of a number of low-power sensor nodes that are attached to the body surface, implanted inside or around the body, that monitor vital physiological parameters and transmit the data to a central device known as hub. WBANs can be classified as in-body (implantable) and on-body (wearable) systems. While the former allows RF communication between invasive devices and hub, the latter supports RF communication among non-invasive devices and hub. The IEEE 802.15 Task Group 6 has recently approved the PHY and MAC specifications for WBANs [5]. It defines a MAC layer in support of three PHY layers: narrow band (NB), ultrawide band (UWB), and human body communications (HBC).
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