Mobile Wireless Sensor Networks (MWSNs) can be defined as a wireless sensor network (WSN) in which sensor nodes are mobile. It has recently become an area of attractive research interest. MWSNs have been attracting increasing interest for supporting a new generation of ubiquitous computing systems with great potential for many applications. However, the communication paradigms in this type of network differ from the ones associated to traditional wireless networks, triggering the need for efficient wireless communication technology. Several wireless technologies have emerged ranging from short and medium distance. Bluetooth, ZigBee and Impulse Radio Ultra Wide Band (IR-UWB) are three popular wireless communications technologies. Due to its various features and advantages (especially low power consumption and low complexity), IR-UWB is a key solution for MWSNs. In this paper, we study and evaluate the performance of IR-UWB for WSNs. We used MiXiM platform under OMNet++ simulator, to analyze and evaluate the main features and advantages of this new technology in terms of transmission time, data coding efficiency and power consumption.

Ultra low power consumption, short transmission time and efficient data coding wireless communication technology for MWSNs

This paper addresses the performance evaluation of Time-Hopping (TH), Direct-Sequence (DS) and sleeping protocol in LDR-UWB (Low data rate-ultra-wideband) network in the view of energy consumption of node The energy lifetime is one of the most challenging issues of low data rate UWB network Ultra-wideband (UWB) radio systems operate using extremely short duration signalling pulses Spread spectrum techniques for multiple access is commonly considered for such a systems First, we describe about the energy consumption model based on TH-SS and DS-SS techniques Secondly, we show the energy consumption analysis with the simulation results

Comparison of TH-SS and DS-SS with sleeping protocol for LDR-UWB network

In this paper, we focus on retransmission following transmission failure in an impulse radio ultra wideband (IR-UWB) system. The causes of transmission failure are classified and a new “selfish” retransmission protocol is proposed. Simulation results show that the proposed protocol improves throughput by up to 100% and decreases retransmission delay by up to 70% compared with a conventional retransmission system.

Selfish retransmission protocol in an IR-UWB system

In a binary asymmetric channel (BAC) it may be necessary to correct only those errors which result from incorrect transmission of one of the two code elements. In optical fiber multichannel systems, the optical amplifiers are critical components and Amplified Spontaneous Emission (ASE) noise in the optical amplifiers is the major source of noise in it. In this paper performance of single as well as concatenated error correcting codes in such systems in presence of Stimulated Raman Scattering and Amplified Spontaneous Emission noises (ASE, ASE- Signal beat and ASE-ASE beat) with asymmetric channel statistics with Binary Pulse Position (BPPM) modulation scheme is reported. The error probability performances have been evaluated and compared between un-coded OOK, coded BAC with OOK and coded BPPM systems. The coded BPPM is found to be more efficient and has a better error rate than others.

/pdf/optical-wdm-systems-with-binary-pulse-position-modulation-2kkwee7jvu.pdf

Optical WDM Systems with Binary Pulse Position Modulation and Coding on Binary Asymmetric Channel

Ultra Wideband Signals and Systems in Communication Engineering

Energy conservation is an important issue in wireless networks, especially for self-organized, low power, low data-rate impulse-radio ultra-wideband (IR-UWB) networks, where every node is a battery-driven device. To conserve energy, it is necessary to turn node into sleep state when no data exist. This paper addresses the impact of two kinds of sleeping protocols (slotted and unslotted) on PHY-MAC in UWB networks. We introduce an analytical model for energy consumption of a node and evaluate the performance of the proposed sleeping protocols. Simulation results show that the energy consumption per packet of slotted sleeping is less than that of unslotted one for bursty load case, but with respect to the load access delay unslotted one consumes less energy, that maximize node lifetime.

Impact of Sleep on PHY-MAC in UWB Networks

Energy conservation is an important issue in wireless networks, especially for self-organized, low power, low data-rate impulse-radio ultra-wideband (IR-UWB) networks, where every node is a battery-driven device. To conserve energy, it is necessary to turn node into sleep state when no data exist. This paper addresses the energy consumption analysis of direct-sequence (DS) versus time-hopping (TH) multiple accesses and two kinds of sleeping protocols (slotted and unslotted) in PHY-MAC for UWB networks. We introduce an analytical model for energy consumption of a node in both TH and DS multiple accesses and evaluate the energy consumption comparison between them and also evaluate the performance of the proposed sleeping protocols. Simulation results show that the energy consumption per packet of DS case is less than TH case and for slotted sleeping is less than that of unslotted one for bursty load case, but with respect to the load access delay unslotted one consumes less energy, that maximize node lifetime.

Analysis of Energy Consumption and Sleeping Protocols in PHY-MAC for UWB Networks

Ultra-wideband (UWB) is a killer technology for short-range wireless communications. In the past, most of the UWB research focused on physical layer but the unique characteristics of UWB make it different to design the upper layer protocols than conventional narrow band systems. Cross-layer protocols have received high attention for UWB networks. In this paper, we investigate the performance of two physical layer schemes: time hopping binary pulse position modulation (TH-BPPM) and time hopping binary pulse amplitude modulation (TH-BPAM) with proposed private MAC protocol for UWB ad-hoc networks. From pulse level to packet level simulation is done in network simulator ns-2 with realistic network environments for varying traffic load, mobility and network density. Our simulation result shows TH-BPAM outperforms TH-BPPM in high traffic load, mobility and dense network cases but in a low traffic load case identical performance is achieved.

Performance Evaluation of TH-BPPM and TH-BPAM with Private MAC in UWB Ad-hoc Networks

In this paper we proposed an energy consumption model for IR-UWB wireless sensor networks. The model takes the advantages of PHY-MAC cross layer design, and we used slotted and un-slotted sleeping protocols to compare the energy consumption. We addressed different system design issues that are responsible to energy consumption and proposed an optimum model for the system design. We expect the slotted sleeping will consume less energy for bursty load than that of the un-slotted one. But if we consider latency, the un-slotted sleeping model performs better than the slotted sleeping case.

An Energy Consumption Model for Time Hopping IR-UWB Wireless Sensor Networks

Ultra-wideband(UWB) is a killer technology for short-range wireless communications. In the past, most of the UWB research focused on physical layer but the unique characteristics of UWB make it different to design the upper layer protocols than conventional narrow band systems. Cross-layer protocols have received high attention for UWB networks. In this paper, we investigate the performance of two physical layer schemes: Time Hopping Binary Pulse Position Modulation(TH-BPPM) and Time Hopping Binary Pulse Amplitude Modulation (TH-BPAM) with proposed private MAC protocol for UWB ad-hoc networks. From pulse level to packet level simulation is done in network simulator ns-2 with realistic network environments for varying traffic load, mobility and network density. Our simulation result shows TH-BPAM outperforms TH-BPPM in high traffic load, mobility and dense network cases but in a low traffic load case identical performance is achieved.

Cross-layer Design of Private MAC with TH-BPPM and TH-BPAM in UWB Ad-hoc Networks

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