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In this paper, we present mobile sinks with energy-efficient sink location service protocol for wireless sensor networks. The data is collected by mobile sinks in sensor networks. To make source built an efficiently forward data from a source node to a sink with minimal delay path, sink and source broadcast the information of their locations each other in different direction. We also propose a reduced...
Conventional timing-optimized synchronous circuit is designed and constrained by the longest critical path delay, i.e. the worst-case design. However, the path delay of the circuit is absolutely data-dependent. In the example of an 8-bit multiplier simulation, for the 10,000 random input patterns, only about 1% of the input patterns exercise the critical path. This fact motivates us to exploit data-dependent...
Bit-error correction is crucial for realizing cost-effective and reliable NAND Flash-memory-based storage systems. In this paper, low-power and high-throughput error-correction circuits have been developed for multilevel cell (MLC) nand Flash memories. The developed circuits employ the Bose-Chaudhuri-Hocquenghem code to correct multiple random bit errors. The error-correcting codes for them are designed...
Along with rapid economic development in China, the energy consumption and pollutants emission are increasing rapidly. It has caused great pressure to resource and environment. How to improve energy productivity in a more cost-effective manner and reduce atmospheric pollutants emission is a big problem at present. Based on Chinese energy consumption and atmospheric pollutants emission between 1990...
Spectrum sensing is a crucial measure for cognitive radio networks (CRN) to protect transmission of primary users. Cooperative spectrum sensing is regarded as the most promising method to improve the reliability of spectrum sensing. However, such cooperation also introduces overhead traffic of control signaling and result transmission which consumes more power in battery-operated mobile terminals...
Cooperative transmission technique is now widely considered as a promising approach to combat fading and achieve energy efficiency in wireless networks. In this paper we focus on the routing problem in energy-constrained wireless sensor networks (WSNs), of which a cooperative MISO-based routing strategy is adopted. We first analyze the physical layer energy consumption model of cooperative transmission...
Cognitive radio technology is used to improve spectrum efficiency by having the cognitive radios act as secondary users to access primary frequency bands when they are not currently being used. In general conditions, cognitive secondary users are mobile nodes powered by battery and consuming power is one of the most important problem that facing cognitive networks; therefore, the power consumption...
Energy efficiency is one of the most important design metrics for wireless sensor networks. As sensor data always have redundancies, compression is introduced for energy savings. However, in some cases, it is unlikely to be wise to trade computation energy for communication savings. In this paper, a novel node-level compression arbitration mechanism is proposed, which is applied to improve compression...
Energy efficiency is a key problem in wireless sensor networks. Keeping only a portion of nodes active and putting the others into sleep mode can conserve energy. In order to maintain satisfactory data quality, we recover the would-be sensed data for sleeping nodes. In this paper, we exploit spatial correlation among densely deployed nodes and use such correlation for data recovery. Loss in data quality...
A few classes of algorithms to implement division in hardware have been used over the years: division by digit-recurrence, by reciprocal approximation by iterative methods and by polynomial approximation. Due to the differences in the algorithms, a comparison among their implementation in terms of performance and precision is sometimes hard to make. In this work, we use power dissipation and energy...
This paper considers a circular high-density WSNs, which is divided into several homogeneous sectors. For a sector, the route nodes transmit data to base station (BS) along the sides of the sector and the radio of nodes can cover all areas of target area. The paper presents an energy-balance solution to balance the energy consumption, by adjusting transmission range with quality coverage under a FSCTA...
Data samples sensed from a densely deployed sensor network often exhibit strong spatial and temporal correlation. Sampling and transmitting these highly correlated data through wireless channel would result in excessive energy consumption. One way to conserve energy is to set a portion of sensors into sleep mode provided their missing data can be well recovered by sensors that remain active. Different...
Cooperative MIMO transmission technique is considered as one of the effective solutions to reduce the energy consumption in wireless sensor networks. However, the existing cooperative MIMO based protocols only focused on how to reduce the energy consumption, but for some applications such as audio/video surveillance sensor network, a large amount of gathered data (formulated as network utility function)...
Most routing protocols for sensor networks try to extend network lifetime by minimizing the energy consumption, but have not taken the network reliability into account. To be adaptive to the harsh environment, we propose an energy-aware, load-balancing and fault-tolerant routing scheme, termed as ELFR. We first present a network robustness model. Based on this model, we design the route discovery...
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