Showing papers by "Aarno Parssinen published in 2015"
TL;DR: This paper proposes the design modification that enables using a WUR to receive the control commands beside the wake-up signals, and reveals that use of this feature does not require complex modifications of the current architectures, but enables to improve energy efficiency and latency for small data blocks transfers.
Abstract: This paper discusses the perspectives of using a wake-up receiver (WUR) in wireless body area network (WBAN) applications with event-driven data transfers. First we compare energy efficiency between the WUR-based and the duty-cycled medium access control protocol -based IEEE 802.15.6 compliant WBAN. Then, we review the architectures of state-of-the-art WURs and discuss their suitability for WBANs. The presented results clearly show that the radio frequency envelope detection based architecture features the lowest power consumption at a cost of sensitivity. The other architectures are capable of providing better sensitivity, but consume more power. Finally, we propose the design modification that enables using a WUR to receive the control commands beside the wake-up signals. The presented results reveal that use of this feature does not require complex modifications of the current architectures, but enables to improve energy efficiency and latency for small data blocks transfers.
13 citations
01 Nov 2015
TL;DR: In this article, the potential of a small and relative simple array configuration for switchable on/off-body communications has been presented for WBANs in terms of beam steering capability, E-field distributions and various E-frequency components along a body phantom model.
Abstract: In future's massive multiple-input multiple-output (MIMO) systems, the usage of antenna arrays has a centre stage solving the dilemma of a link range vs. a data rate. From wearable application perspective, proposed antennas in open literature have been mainly passive single element configurations which are optimised for either off-or on-body communication purposes. Arrays can bring fundamental improvements for the purposes of a wireless body area network (WBAN) by enabling possibility to realize an electronically switchable on/off-body communication antenna configuration. As recent trends in wearable market have shown that cellular communications are becoming products, the purpose of this article is to present the potential of a small and relative simple array configuration for switchable on/off-body communications. In this paper, free space channel path gain S21 is compared for the antennas at 2.4 GHz with respect to an array at 10 GHz with the equal aperture. Body tissue characteristics are compared, too. The functionality of the proposed array is shown in terms of beam steering capability, E-field distributions and various E-field (Ex, Ey, Ez, and Eabs) components along a body phantom model.
4 citations