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The recent trend in wireless communication networks has seen the focus shift from spectrum efficiency to energy efficiency. Use of multi clock-rate sampling devices to provide reduced power idle listening promises to significantly reduce power consumption in wireless devices without affecting throughput or transmission range. However, the use of frequency agnostic preamble to enable multi clock-rate...
Wireless Sensor Networks are to a large extent characterized by the sensing, communication and computation constraints of their constituent sensor nodes. Moreover, energy efficient operation is critical, since the nodes are typically powered by batteries or scavenge energy from their environment. Communication over a wireless channel is prone to noise and interference, which causes errors to occur...
A new technique for performing energy detection for ultra-low power OOK-modulated radio receivers is presented. This technique uses oversampling and digital averaging to reduce the excess noise contributions of wideband gain following the channel selection stage in these radios and helps to bring the noise performance closer to the expected value from communications theory. The proposed sampler effectively...
Cooperative relay techniques are exploited to reduce the transmission energy consumption which is very important for average and long range transmission in wireless sensor networks (WSNs). In this paper, the system having a two-antenna source, two one-antenna relays and a one-antenna destination is considered. Using distributed space-time code at relays, MIMO simple cooperative relay model (MSCR)...
Error control coding (ECC) is a classic approach used to increase link reliability and lower the required transmitted power. It provides coding gain, resulting in transmitter energy savings, at the cost of added decoder power consumption. But the choice of ECC is very critical in the case of wireless sensor network (WSN). Since the WSNs are energy constraint in nature, both the BER and power consumption...
This paper presents a transmitter design for Ultra Wideband Impulse Radio (UWB-IR) communications. The design is targeted towards the implementation of passive Wireless Sensor Tags (WST) where micro-power consumption is required. The transmitter has been implemented in UMC 0.18μm CMOS and placed inside a QFN lead-less package. It complies with the FCC regulations for Pulse Rate Frequencies (PRF) up...
The radio applications in wireless sensor networks where the energy constraint is vital are considered. In this context, the impact of cooperative strategies is analyzed thanks to the realistic power model of a real radio transceiver. A system using a two-antenna source, two one-antenna relays and one-antenna destination is considered. Three types of association strategies of Space time coding and...
Sensor networks have applications that have spread widely in various fields of the industry; and one of the most useful applications is data collection. Specifically, the data collection for large areas has become critical in commercial industry, science, and academic researches. However, the existing relevant MAC protocols have shown their unsuitability to apply for these systems. In our previous...
In wireless sensor networks where nodes are powered by batteries, it is critical to prolong the network lifetime by minimizing the energy consumption of each node. In this paper, the cooperative multi-input-multi-output (MIMO) and data aggregation techniques are jointly adopted to improve energy efficiency in a cluster based wireless sensor network. Using the energy model derived, the average energy...
In order to make sure that the Wireless Sensor Networks can transmit signals efficiently and reliably in uneven, heterogeneous and limited space, the V-MIMO-OFDM mode is used underground coal mines. It allows the nodes equipped with single antenna to process information and transmit collaboratively, so multi-path fading can be resisted efficiently. The energy consumption of SISO, V-MIMO and V-MIMO-OFDM...
In this paper, we propose a framework for the study of power consumption and bit error rate (BER) performance of non-coherent impulse radio ultra wideband (IR-UWB) correlation receivers in the IEEE 802.15.3a channel. Using this framework, transmitted reference (TR) and energy detection (ED) correlation receivers are studied and compared. The receivers are assumed to operate in the 3.1-5 GHz band targeting...
Most ad hoc mobile devices in wireless networks operate on batteries and power consumption is therefore an important issue for wireless network design. In this paper, we propose and investigate a new distributed cooperative routing algorithm that realizes minimum power transmission for each composed cooperative link, given the link BER (bit error rate) constrained at a certain target level. The key...
Sensor nodes in wireless sensor networks (WSNs) are often expected to operate on batteries for a long period of time. Battery power efficiency (BPE) is therefore a critical factor dictating the lifetime of WSNs. In this paper, we aim to select the appropriate modulation scheme from a battery power efficiency perspective. Pulse position modulation (PPM) and on-off keying (OOK), as low-complexity pulse-based...
This paper presents a new energy-efficient cooperative sensor network scheme. Cooperative nodes shift the carrier frequency of the source node, and the destination node receives the signal from the source node and the cooperative nodes as a standard orthogonal frequency division multiplexing (OFDM) receiver. The maximal ratio combining (MRC) approach is applied to achieve full diversity with low complexity...
In this paper, an energy efficient adaptive modulation scheme is proposed for a wireless cognitive radio ad hoc network, where each node is equipped with cognitive radio and the network is an OFDMA system operating on time slots. In each slot, the users with new traffic demand will sense the spectrum and locate the available subcarrier set. Then they choose subcarriers with favorable channel condition...
We propose a novel distributed cross-layer optimization approach for cognitive radio wireless networks. A cognitive radio is a wireless device that is capable of sensing the prevailing environmental conditions and automatically adapting its operating parameters in order to enhance the performance of both the system and potentially the whole network. Given the lack of a centralized intelligence to...
3D contactless technology based on capacitive coupling represents a promising solution for high-speed and low power signaling in vertically integrated chips. AC coupled interconnects do not suffer from mechanical stress, and the parasitic load is much reduced when compared to standard DC solutions, such as wire bonding and micro bumps. Communication system based on wireless interconnection scheme...
This paper evaluates transmission performance and power-saving effect of the collaborative beamforming for wireless ubiquitous network systems. The evaluation of power-saving includes the power consumption for signal transmission to collaborative sensors in beamforming. The simulation result shows that the total power consumption of the beamforming with 3 collaborative sensors can be decreased to...
In this paper, we propose a cross-layer optimization approach that exploits retransmission diversity in wireless CDMA communications. Conventionally, data packets that are not correctly detected are usually dropped. These dropped packets can be used to help data packet detection. By exploiting all the retransmitted packets, data packets can be correctly detected with higher probability. The proposed...
Wireless sensor networks consist of a large number sensors spread across a given geographical area. Each sensor has its own communication capability as well as certain level of intelligence for signal processing and networking. As the sensor nodes are densely populated, communication range requirement for these nodes is smaller. After signal detection, a number of sensor nodes communicate over the...
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