Báo cáo hóa học: " Research Article Energy-Efficient Transmission of Wavelet-Based Images in Wireless Sensor Networks" pdf

... algorithms in the remaining of the paper. Each sensor node i, including the base station, maintains the following variables. (i) Father i : the father of the sensor in the final spanning tree. The base ... with a processing unit and storage of data, a unit of wireless transmission and a battery. Organized as a network, the sensors (or nodes) of a WSN, despite resource con...

Ngày tải lên: 21/06/2014, 11:20

... surrounding this area: in the example in Figure 1(a) there are six sensors. (In the remainder of this paper, by sensor we will denote the wireless transceiver which includes the sensing element. However, ... Sastry, “Distributed environmental mon- itorning using random sensor networks,” in Proceedings of the 2nd International Workshop on Information Processing in Sensor Ne...

Ngày tải lên: 21/06/2014, 17:20

... the paper in Section 5. 2. TOA-BASED RANGING IN INDOOR MULTIPATH ENVIRONMENTS 2.1. Ranging coverage One of the major factors determining the quality of TOA- based ranging and localization in indoor ... reproduction in any medium, provided the original work is properly cited. 1. INTRODUCTION In recent years, there has been a growing interest in ad hoc and wireless sensor ne...

Ngày tải lên: 22/06/2014, 06:20

... left of the intersection where the same occurs for φ c,b . (iii) The sign of φ s,b changes at an intersection of curves in (12) (say intersection 1 in Figure 2) which is to the left of the intersection ... INTRODUCTION AND RELATED WORK A wireless sensor network (WSN) consists of several small scale miniature devices capable of onboard sensing, comput- ing, and communicatio...

Ngày tải lên: 22/06/2014, 19:20

... combines uplink and downlink scheduling in one discipline and allows the use of a centralized single server scheduler design as shown in Figure 2. As it is seen in Figure 2, there are two sets of ... implemented in the access point. CAPS uses the concept of virtual packets and combines the task of scheduling uplink and downlink flows of a naturally distributed CSMA/CA environ...

Ngày tải lên: 21/06/2014, 23:20

... receives the RREP, it inserts the routing information about D into its routing table and uses this routing information to send data to D. Instead of blindly searching for the route in the entire network, ... Kang Ling Fang 1 1 College of Information Science and Engineering, Engineering Research Center of Metallurgical Automation and Measurement Technology, Ministry of Education, W...

Ngày tải lên: 21/06/2014, 05:20

... et al., “Trio: enabling sustainable and scalable outdoor wireless sensor network deployments,” in Proceedings of the 5th International Conference on Information Processing in Sensor Networks (IPSN ... architecture of typical sensor nodes. Next we present the major ideas and challenges of the design of HINT. In the next section we introduce the implementation of HINT ai...

Ngày tải lên: 21/06/2014, 17:20

... Obtaining the optimal sharing efficiecy on gateways. 3.2. Sharing Efficiency of Gateways. Two gateways interfere with each other if they are within the distance of Int D- hops. Int D is defined as Interfering ... maximized. In the first step, the table of nonoverlapping interfering groups is constructed as follows: (1) each interfering group appears as a single row in the table and contai...

Ngày tải lên: 21/06/2014, 18:20

... the transmission power in dBm, G TA is the gain of the transmission antenna in dBi, l T are the additional losses in the transmission path before the antenna, G RA is the gain of the receiving ... quality indicator introduced in [24] is proposed. This indicator is the effective frame rate that is introduced and discussed in later sections of this paper. As packet errors o...

Ngày tải lên: 22/06/2014, 19:20

... other hand, radio interference is an important problem in the wireless communication. Interference prob- lems include two kinds of problems. One of them is to re- duce in uence of interference. Another ... determined by modulation meth- ods and spec of the receiver. In the communication timing control described in Section 2.3 , however, the in uence of in- terference wav...

Ngày tải lên: 22/06/2014, 22:20