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Fast deploying and networking in a disaster area are of great importance. Firstly, we propose an architecture of Emergency Medical Networks in this paper. The objective of this study is to achieve the optimality of heterogeneous sensor nodes assignment in this network. To obtain the needed coverage, network designers initially need to determine how many sensor nodes should be deployed in the disaster...
In this paper, an optional architecture of wireless mesh networks based on the IEEE 802.11s draft is proposed and implemented which aims at providing a low-cost, secure and wide-range wireless WLAN-mesh network in the real life. In order to validate the security and practicality of the new architecture, a testbed is deployed which consists of six mesh access points (MAPs) and one mesh portal point...
This paper presents a high throughput pipeline decoder architecture for multiple input multiple output (MIMO) with good performance and its field programmable gate array (FPGA) implementation. This enhanced pipeline decoder architecture can handle large amounts of data and is suitable for very high throughput system. Based on the proposed architecture, the pipeline decoder architecture has been implemented...
Chronic diseases are gradually becoming the principal factors of harm to people's health. Fortunately, the development of e-health provides a novel thought for chronic disease prevention and treatment. This paper focuses on the research of cardiovascular disease (CVDs) prevention and early warning techniques using e-health and data mining. In this paper, we will use weighted associative classification...
This paper presents a healthcare monitoring architecture coupled with a wireless sensor network and wearable sensor systems which monitor chronic patients in nursing house or the elderly in their home. With this architecture, we investigate how sensor nodes are deployed in the three-dimension (3D) monitoring region to achieve uniform distribution, which directly determines the Quality of Service (QoS)...
Energy is one of the crucial factors in wireless sensor network. In this paper, we consider energy fairness problem in heterogeneous wireless sensor network. Firstly, we propose a nodes' deployment model in which we deploy heterogeneous sensor nodes judiciously to conserve energy. This prevents the problem of occurrence of 'energy holes' and ensures prolonged network lifetime. Then, we use Game Theory...
This paper focuses on the optimization of energy efficiency (EE) for BSs with distributed multiple-input multiple-output (MIMO) using an efficient antenna sleep strategy. A novel metric called sleep EE gain is proposed in this paper to evaluate the energy efficiency performance of sleep strategy in distributed MIMO systems. A related closed-form expression is developed to determine the optimum antenna...
This paper studies the design and implementation of MAC (Media Access Control) layer in very-high-throughput WLAN(Wireless Local Area Network), which is based on the latest IEEE 802.11ac protocol. As an intermediate layer between service layer and physical layer, MAC layer is responsible for deployment and reorganization of data packets during sending and receiving process. Meanwhile, system implementation...
The Wireless Local Area Network (WLAN) has experienced tremendous changes through these days, both in usage and technological aspects. Recently, 802.11ac and 802.11ad protocols for WLAN have been standardized by IEEE. They are both amendments to the 802.11-2012 protocol and their primary Medium Access Control (MAC) technique is Distributed Coordination Function (DCF). What's more, in order to improve...
Energy-efficient transmission is an important issue for wireless communication systems, due to the increased energy consumption and limited battery capacity. In this paper, we study the energy-efficient transmission in a single cellular downlink multi-user Orthogonal Frequency Division Multiple Access (OFDMA) system. The transmit power consumption and the circuit power consumption are both taken into...
For the limitation of resource and the requirement of environment, energy-efficient OFDMA systems gradually play an important role in wireless communication. In this paper, we present a novel resource allocation algorithm for downlink energy-efficient OFDMA systems, under the given QoS requirement and power limitation constraints. Compared with the existing works, we propose a sub carrier and power...
This paper focuses on the optimization of coordinated spectrum sensing for cognitive radio (CR) networks using an efficient cognitive terminal (CT) assignment strategy. A metric called ineffective transmission-effective transmission ratio (ITETR) is proposed to evaluate the performance of the CT assignment strategy. Considering the diversity of channel utilization and CT sensing performance, the optimization...
Cognitive spectrum sensing is a key technology to improve the spectrum utilization and meanwhile decrease the possibility of interfering the primary users(PUs). Based on the cooperation of several cognitive radio sensors(CRSs), the channel fading and hidden terminal problems are avoided. The performance of detection has great relevance with the algorithm of combining the data from different CRSs....
This paper addresses relay selection(RS) and power allocation(PA) issues for a physical-layer network coding (PNC) relay based secondary user (SU) communication in cognitive radio networks, in which two secondary transceiver nodes exchange their information with the assistance of a relay under interference power threshold (IPT) constraints. We propose an optimal energy-efficient RS and PA (OE-RS-PA)...
Increasing more patients (especially the elderly) suffering from comorbid diseases motivates us to develop a decision support system which can combine multiple concurrently applied disease-specific clinical practice guidelines. Combining multiple guidelines is not naively running each guideline one by one. Instead, the occurance of potential conflicts between guidelines must be detected and mitigated...
In this letter, a novel metric is proposed to evaluate the average sensing energy-efficiency of cognitive radio (CR) networks. A theorem as well as the related closed-form expression for determining the optimum number of cooperative sensing cognitive terminals is provided to optimize the proposed metric. According to the theorem, we propose an efficient terminal-assignment strategy for coordinated...
This paper focuses on linear precoding in a cognitive radio (CR) multi-input multi-output (MIMO) network, where a secondary broadcast channel shares the same spectrum with a licensed primary user (PU). Considering cooperative feedback from PU to the secondary transmitter (ST), a linear precoding scheme is proposed to minimize the expected mean square error (MSE) and null out the interference to the...
In the intelligent monitoring of the hypertensive patients, it's necessary to assess their treatment effect and give corresponding diagnostic feedback automatically. This paper proposed a hybrid decision support system (DSS) combining several data mining techniques using an improved weighted majority voting scheme (iWMV). The mass health data of hypertensive patients were used as data source of the...
This paper presents a novel type 2 diabetes mellitus (T2DM) monitoring system. Decisions on the statuses of diabetes control and predictions of future blood glucose of an individual made by the system depend both on the original medical data collected by medical sensors and some contexts either are entered manually or generated automatically. When dealing with the data, first we clean and transform...
In this paper, we detail the design of a hypertension monitoring system via telecommunication and computer technologies and propose a method for theoretically analyzing its system accuracy. In the design of our system, we add a novel decision support unit, building on a diagnosis standard in medicine, into our monitoring system. The architecture of our system, including this decision support system,...
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