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In this paper, we consider multiple access in diffusion-based molecular communication where multiple bio-nanomachines transmit bits of information to a micro-scale receiver device in a shared environment. Each bio-nanomachine acting as a transmitter releases a molecule to send a Ί' and no molecule to send a ‘Ο’. The molecules released by transmitters then propagate by Brownian motion in the environment...
We study the real-time data aggregation in contention-based wireless sensor networks that use CSMA/CA MAC layer protocols as defined in IEEE 802.15.4 or IEEE 802.11 standard. The problem is, for a given data aggregation tree and a delay bound, to maximize the average transmission success probability of all sensor nodes within the delay bound. In CSMA/CA protocols, the success probability and the expected...
We study the real-time data aggregation in contention-based wireless sensor networks that use CSMA/CA MAC layer protocols as defined in IEEE 802.15.4 or IEEE 802.11 standard. The problem is, for a given data aggregation tree and a delay bound, to maximize the overall transmission success probability of all sensor nodes within the delay bound. In CSMA/CA protocols, the success probability and the expected...
This letter introduces an observed spectrum sensing issue that: with certain probability, a secondary user (SU) misinterprets a non-interfered primary user (PU) is being interfered, resulting in access opportunity loss. This issue termed as spatial false alarm (SFA) problem is one of determinants on SU's medium access probability. However, it is neglected in current research related to spectrum sensing...
Wireless Sensor Networks, WSN for short, envisions ubiquitous computing future in many fields, such as environmental monitoring, traffic management, disaster forecasting, military surveillance and inventory tracking. In this paper, we put forward the software and hardware design methods of WSN which based on Bluetooth and embedded system. We adopt the Bluetooth as the means of wireless communication,...
This paper describes an on-line monitor system based on wireless sensor networks, which could test the ingredients of vehicles' off-gases, and also introduces the design of the hardware and software in details, and transplants the Zigbee protocol on the system at last. With the character of portability and the high precision gas sensors, the system could monitor the off-gases and distinguish the ingredients...
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