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Adaptive transmission power control schemes have been introduced in wireless sensor networks to adjust energy consumption under different network conditions. This is a crucial goal, given the constraints under which sensor communications operate. Power reduction may however have counter-productive effects to network performance. Yet, indiscriminate power boosting may detrimentally affect interference...
An initiative approach towards uniform integration of Wireless Body Area Network (WBAN) with various outgoing networks can provide a landmark in Ubiquitous Health care (U-Health) development. More interestingly, provided with Self Organizing Network (SON) characteristics, integration of WBAN with femtocell deployed cellular networks, which can bridge WBAN with widely deployed broadband connections...
In Wireless Local Area Networks (WLANs), channel management is important in achieving reliable data communications and satisfying QoS requirements. The key aspects of wireless channel management are monitoring the channel quality and adapting quickly to the network conditions by switching to a better channel. We propose a wireless channel monitoring system with co-located monitoring surrogates. Our...
The electromagnetic environment in a hospital is characterized by means of a measurement campaign. This serves as a basis for the evaluation of best-suited future technologies to be used for wireless patient monitoring, where highest quality of service is required for sensors recording vital data. Results show that the UWB band features equal dynamic ranges as the ISM band but allows operation at...
The rise in world's aging population and escalating healthcare cost, necessitate directed research on new health monitoring paradigms. Upcoming health monitoring systems require the integration of heterogeneous wireless technologies, to achieve an 'anytime and anywhere' medical environment. The use of well established wireless technologies, such as Bluetooth and IEEE 802.11b Wireless LAN (WLAN) in...
IEEE P1900.4 is an emerging standard for optimized radio resource utilization where cognitive radio technologies are used for efficient spectrum utilization. In this paper, we design and implement a cognitive wireless network system based on open documents of IEEE P1900.4, and evaluate its performance using UDP streaming and HTTP download. Our experiments show interesting results that total network...
In this paper, we study bandwidth management of a wireless/optical based access/metro network in support of voice and data services. For voice services, we use a finite state Markov Chain to estimate the blocking probability of voice circuits over an Adaptive modulation and coding wireless channel, as a function of the channel parameters. For data services, we evaluate a rate matching and a buffer...
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