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This paper focuses on the performance measurement upon different terrains in 3D wireless sensor networks. We investigate the impacts of traffic load and operation mode in specific 3D terrains based on Durkin¡¦s propagation model. We also investigate the effects of different beacon interval and super frame duration in the IEEE 802.15.4 MAC super frame. Many comprehensive studies are shown by comparing...
In this paper, a jointed preamble/boundary detection and fractional carrier frequency offset (CFO) estimation design is presented which supports dual SC/HSI modes of IEEE 802.15.3c applications. Based on correlation based algorithms which utilizes the structure of preamble, an efficiency architecture is proposed which realizes synchronization detection with a sequential detection scheme and only single...
Reset is one of the most important signals in many designs. Since reset is typically not timing critical, it is handled at late physical design stages. However, the large fanout of reset and the lack of routing resources at these stages can create variant delays on different targets of the reset signal, creating reset recovery problems. Traditional approaches address this problem using physical design...
Limitations of the delay bandwidth in active delay circuits can be significantly improved in high-order transfer functions. In this paper, a flat wideband delay circuit is presented using the 2nd-order form of the Padé approximant. The delay circuit is designed and implemented in 0.18 μm CMOS technology. The measured results show that the circuit achieves a delay time of 49 psec in the GHz frequency...
Wireless ad hoc networks are an emerging and popular technology to the world; however, the benefits of them are actually their fragility, too. Owing to mobile node movement, the link break problem always occurs in the network. The problem greatly influences the throughput, delay, jitter, and lots of performance issues of a routing protocol. Hence, this article is proposed to evaluate the influence...
In this paper, a time delay circuit is designed for path mismatch compensation in the polar loop transmitter for the WiMAX standard. The delay circuit contains two stages, each realized in the second-order form of the Padé approximant, to account for a tuning range from 1 ns to 10 ns in 1 ns steps. The proposed circuit is fabricated using 0.35-μm SiGe technology in order to be incorporated into a...
The topology of a delay tolerant network (DTN) over time has been modeled by a space-time graph. However, the mobility of nodes, such as buses, may not be completely predictable due to factors such as traffic load, road condition, the number of passengers getting on and off the buses, and the operations of traffic lights. In this paper, we adapt the space-time graph by augmenting each horizontal edge...
A table of squares for n-bit numbers can be used for LUT-based multiplication for n-bit numbers. This squares-based multiplication using look-up table simplifies the process as a simple addition/subtraction and table look-up, and, thus, speed-ups the operating speed. This study presents a low-cost, yet efficient square generator using a recursive scheme.
Remote medical monitoring with medical sensors and wireless communications has recently gained attention for the potential savings and improved quality in patient health-care. Currently, many mobile wireless medical infrastructures connect to the Internet in a point-to-point fashion, such as the cellular network. However, our research investigates new models for remote patient care that exploit P2P...
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