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Conventional energy detection (ED) spectrum sensing method requires the knowledge of noise power and consequently suffers from noise uncertainty. In this letter we propose a novel blind spatial spectrum sensing method to conquer this problem. We utilize an Electronically Steerable Parasitic Antenna Receptor (ESPAR) which can divide the space into several sectors and switch receive beampattern to each...
ZigBee is widely used in many fields for its low cost, low power. This paper discussed the network topology, device type and protocol architecture about ZigBee protocol and introduced CC2530 chip. Then we used Z-Stack protocol stack for networking and did some tests based on the previous content, such as the network communication distance and packet loss rate test. Test results show, ZigBee networking...
This paper introduces a cost-effective and robust positioning architecture that relies on wireless sensor networks (WSNs) for construction resources localization. The architecture determines the location of mobile sensor nodes by evaluating radio signal strengths (RSS) received by stationary sensor nodes. Only a limited quantity of reference points with known locations and pre-calibrated RSS in relation...
Blocking probability, coverage quality, and interference are three imperative factors to be included in planning a radio frequency (RF) communication system. Coverage quality refers to the acceptable communication quality, which can be determined in three ways: land surface, population, or traffic. In a RF communication, interference can be categorized into noise, co-channel interference, and adjacent...
Deep ground penetrating radar, as its name says, is able to image the deep buried objects with high resolution. It becomes an important tool for human to know the underground world. In this paper a stepped frequency deep penetrating radar system has been developed. This miniature system is designed for three operation modes: Mode 1 is fast measurement, real-time data storage, off-line data analysis...
In order to improve the communication quality in practical network coding system, three main strategies are proposed to protect the encoding vectors, which includes importing cyclical redundancy into the encoding vectors of the coded packets, executing distributed space-time code to the encoded packets and a shift between the above two modes above according to different signal-noise ratios. And then...
Emerging broadband entertainment applications such as IPTV (Internet protocol television) and whole-house PVR (personal video recorder) bring new challenges to existing home networks. Gigabit Ethernet is an obvious choice, but consumers are still reluctant due to the need for rewiring in most dwellings. Several ldquono-new-wiresrdquo technologies have been proposed in recent years, but there is little...
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