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Recently, applying the multimedia wireless sensor networks and computer vision techniques in the outdoor agriculture field can be observed. Since the performance of such techniques is limited by the low data rate of the wireless sensor network, the transmission using the wider bandwidth is one of the possible solutions. This paper proposes the technique to develop the wide-band channel sounder for...
Future tactical communications involves high data rate best effort traffic working alongside real-time traffic for time-critical applications with hard deadlines. Unavailable bandwidth and/or untimely responses may lead to undesired or even catastrophic outcomes. Ethernet-based communication systems are one of the major tactical network standards due to the higher bandwidth, better utilization, and...
In this paper, we propose a new method to compensate Doppler frequency shift for OFDM-based underwater acoustic communication systems. In order to save bandwidth, we do not use additional signal header (preamble) in each OFDM frame as proposed in many conventional approaches. Instead, the central sub-carrier is reserved for pilot transmission. This subcarrier is so-called as the carrier frequency...
This paper evaluates the link-level performance of millimeter wave (mmWave) wireless communication system operating on 39.5 GHz frequency band. A frame structure based on the long term evolution (LTE) is proposed, including resource allocation and reference signal pattern. Some key parameters are carefully set to adapt to the mmWave frequency. Simulation results validate that the performance of mmWave...
This work studies a digital transmission system by fiber optic. We give special relevance to the synchronism block. The fiber is a transmission medium with large bandwidth and low attenuation. These characteristics allow high speed and long distances. The transmission, instead asynchronous, it is synchronous what provides a big efficiency of 100%. However, the synchronous transmission needs a synchronizer...
Synchronization has become a main concern in communication and control systems during the last years. Although there are several standard mechanisms to accomplish timing requirements, development and improvement of high synchronization technologies is required to obtain better performance and quality of service. In this context, the enhanced version of IEEE 1588v2 synchronization protocol, known as...
Software defined radio (SDR) is a rapidly developing technology that implements signal processing components partially or completely in software. In this paper, SDR's potential as a platform for ground-penetrating radar (GPR) is explored. The stepped-frequency radar method is implemented using off-the-shelf SDR hardware and open-source software. SDR is typically designed for communications applications,...
Tactical Targeting Networks Technology (TTNT) is the latest generation of data link technology. This paper first introduces the basic technical situation and performance of the technology. Secondly, according to the technical characteristics of the new technology, the basic structure of the waveform is analyzed, and the waveform structure of the parallel transmission is given. Finally, according to...
The utilization of time-synchronized operations (TSO) is gaining interest in the research community on Software-Defined Networking (SDN). This paper discusses TSO applicability in electronic packet and optical networks. In electronic packet networks, the TSO approach has been shown to improve network performance, thanks to timed network updates. In optical networks, this approach enables novel security...
For emergency medical cyber-physical systems, enhancing thesafety and effectiveness of patient care, especially in rural areas,is essential. While the doctor to patient ratio in the United Statesis 30 to 10,000 in large metropolitan areas, it is only 5 to 10,000 inmost rural areas; and the highest death rates are often found inthe most rural counties [3]. Use of telecommunication technologiescan enhance...
Contemporary frameworks for data analytics, such as Hadoop, Spark, and Flink seek to allow applications to scale performance flexibly by adding hardware nodes. However, we find that when the computation on each individual node is optimized, peripheral activities such as creating data partitions, messaging and synchronizing between nodes diminish the speedup obtainable from adding more hardware. We...
With the introduction of DVB-T2 in Germany and other European countries as new standard for Digital Video Broadcasting the underlying passive radar signal processing has also to be adapted, because the currently used predecessor, DVB-T, is not compatible to DVB-T2 on the physical layer. DVB-T2 has been improved in order to achieve a higher data rate and to allow more flexibility for different use...
LTE has several advantages to be investigated as transmitter of opportunity for passive radar in Germany: low carrier frequencies (i.e. low free space attenuation), high bandwidth (i.e. high range resolution) and wide area network (i.e. large availability). Therefore the signal correlation behavior is investigated. Additionally, a signal processing method is proposed for passive radar using LTE. The...
Caching plays an important role in many domains, as it can lead to important performance improvements. A key-value based caching system typically stores the results of popular queries in efficient storage locations. While caching enjoys widespread usage in the context of dynamic web applications, most mainstream caching systems store static binary items, which makes them impractical for many real-world...
Crowdsourced signal monitoring systems are gaining attention for capturing the wireless spectrum at large geographical scale. Yet, most of the current systems are still limited to simple power spectrum measurements reported by each sensor. Our objective is to enhance such systems with signal decoding capabilities performed in the backend while retaining the original vision of a low-cost and crowdsourced...
Receive diversity increases the reliability and robustness of ultra-low power Wireless Sensor Networks (WSNs) by using spatially separated antennas without modifying the physical layer. We consider a distributed ground network in the wild to track bats in their natural habitat. The bats are equipped with a sensor node of only 2 g that limits the energy budget available for communication. In this work,...
In this paper we propose the Slot Reservation Announcement (SRA) access scheme to minimize the occurrence of channel-access collisions in infrastructure IEEE 802.11 networks under emergency and crowded scenarios. SRA is based on slot reservation in lieu of a randomized backoff approach to increase the channel-access success ratio. The proposed scheme rids IEEE 802.11-like access networks of throughput...
We present a single-node, multi-GPU programmable graph processing library that allows programmers to easily extend single-GPU graph algorithms to achieve scalable performance on large graphs with billions of edges. Directly using the single-GPU implementations, our design only requires programmers to specify a few algorithm-dependent concerns, hiding most multi-GPU related implementation details....
The reliability of the increasing number of modern applications and systems strongly depends on interconnecting technology. Complex systems which usually need to exchange, among other things, multimedia data together with safety-related information, as in the automotive or avionic industry, for example, make demands on both the high bandwidth and the deterministic behavior of the communication. TTEthernet...
Correctly maintained synchronization between devices is very important in deterministic networks like TTEthernet where is used AS6802 standard for this purposes. In this paper is depicted how to calculate number of integration cycles per cluster period depending on accuracy of clocks implemented in network devices. Influence of the number of integration cycles to bandwidth utilization is analyzed...
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