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This paper presents the new result in the Trajectory approach when considering more than one packet of a sporadic flow is overstocked on an output port for an AFDX network, using the FIFO assumption. The principal contribution is to compute upper bounds of end-to-end delays for the processing flows by the recursive calculation of interference time windows. The paper proposes a memo recursive computation...
The General interferometry technique (GINTY) is used to measure the mean PMD of an entire fibre link. In this paper, we analyse the GINTY interferogram envelopes in the presence of an adjustable high polarization mode dispersion (HiPMD) segment. Experimental results show that the GINTY interferogram will develop two symmetric satellite interferogram envelopes and one central interferogram envelope...
Medium waveband navigation systems are considered. Systems using code-division multiplexing have intrasystem interference level determined by cross-correlation sidelobe. Interference immunity of spread spectrum signal with minimum shift keying correlation receiver is improved with powerful adjacent-channel interference compensator providing high accuracy interference copy forming. Correlation receiver...
A Sensor Network Aided Cognitive Radio Network uses the concept of a wireless sensor network that assists a cognitive radio network by providing information about the current primary spectrum occupancy. In this paper we study the performance of the cognitive network for various cell sizes and transmit power levels when deployed co-located with a mobile primary system that uses a cellular reuse pattern...
This work proposes an adaptive intercell interference avoidance scheme for the self-organization in Orthogonal Frequency Division Multiple Access (OFDMA) femtocell networks. Due to the expected large number of user-deployed cells, the femtocell networks suffers from the intercell interference problem. In this paper, we define the self-organizing resource allocation problem to maximize resource efficiency...
Coexistence of multiple wireless body area networks (WBAN) is a very challenging problem because piconets move frequently and each piconet can have hundreds of sensors. The IEEE 802.15.6 task group is developing a standard based on superframe-level frequency-hopping scheme, which is a good solution to the piconet coexistence problem without requiring coordination between piconets. However, its spectrum...
In this paper we propose an inter-cell coordination scheme that coordinates the transmission time and mode of users in neighboring cells. The scheme is designed for 3G LTE systems and therefore takes into account interface constraints especially for the uplink. The objective of the scheme is to assign physical resource blocks together with the transmission mode to users in a way that minimizes interference...
In this paper, we investigate the outage performance of a dual-hop relaying systems with partial relay selection and feedback delay. The analysis considers the case of Rayleigh fading channels when the relaying station as well as the destination undergo mutually independent interfering signals. Particularly, we derive the cumulative distribution function (c.d.f.) of a new type of random variable involving...
The multicarrier modulations (MCM) became widely used and have been applied to wire and wireless transmission systems in recent years. This modulation techniques enable a near-perfect utilization of the provided frequency band on metallic cables and they also eliminate multipath propagation effect in terrestrial transmission. Mainly used implementations of MCM are Discrete MultiTone (DMT) and Orthogonal...
Combining electronics, telecommunications, and information technology to connect devices and remote systems is perhaps the best feature of the future Machine-to-Machine (M2M) technology. Wireless communication technologies for managing future M2M applications are becoming mature, but electromagnetic interference and time dispersion in industrial environments can limit the successful functioning of...
The deep quasiperiodic variations in the part of frequency dependence of amplitude of reflections from layer Es observed by Kazan ionosonde was discovered. The analysis of height location of traces in an ionogram has shown that beatings arise because of interference between o- and x-modes. For an explanation of such interaction details a modeling is performed on the basis of calculations of coefficient...
Robust and load-balanced routing protocol for traffic engineering is very important to stabiLity of Internet. A novel adaptive load-balanced routing algorithm(ALB) based on minimum interference and cross-layer design principle is proposed. The least interference path algorithm principle is introduced briefly, and the implementation of adaptive load-balanced routing algorithm is elaborated in detail...
In order for interference alignment (IA) techniques to be implemented in future generation mobile multiple-input multipleoutput (MIMO) communications systems, they must be shown to be robust to system limitations such as quantisation and delay. Current IA algorithms in the literature assume global and instantaneous channel knowledge. In this paper, a novel IA algorithm is proposed which uses limited...
Delivery of high-quality streaming services over multi-hop wireless mesh networks (WMNs) is a challenging research problem because of quality fluctuation and interference of wireless links in WMNs, as well as strict throughput, delay, and reliability requirements of streaming applications. In this paper, we propose a Network Assisted Peer-to-Peer (NAP2P) system for file-based media streaming services...
In the domain of real-time systems, the analysis of the timing behavior of programs is crucial for guaranteeing the schedulability and thus the safeness of a system. Static analyses of the WCET (Worst-Case Execution Time) have proven to be a key element for timing analysis, as they provide safe upper bounds on a program's execution time. For single-core systems, industrial-strength WCET analyzers...
In underwater sensor networks (UWSNs), acoustic communication is commonly used unlike that in terrestrial wireless networks. The long propagation delay of acoustic signals causes spatio-temporal uncertainty, which makes the link scheduling in UWSNs a challenging problem. To describe the propagation delays of the transmission links and deal with the spatio-temporal uncertainty, we construct a so called...
Physical-layer cooperation allows leveraging the spatial diversity of the wireless channel without requiring multiple antennas on a single device. However, most research in this field focuses on optimizing physical layer metrics, with little consideration for network-wide and application-specific performance measures. This paper studies cross-layer design techniques for video streaming over cooperative...
Wireless mesh networks (WMNs) have attracted much attention lately for providing efficiently wireless services with high quality of service (QoS). Metropolitan WMNs are a low-cost solution for providing broadband wireless internet access in large areas. One of the fundamental issues of wireless communications is interference. In WMNs interference can be caused by simultaneous transmissions at links...
In this paper we report results from the Calibration and Communications Sea Trial 2010. We explain in detail the used cyclic-prefix orthogonal frequency division multiplexing (OFDM) signal design and adopted receiver processing, based on sparse channel estimation and intercarrier interference (ICI) equalization. We then focus on two phenomena that are not commonly treated in wireless communications...
Pulse position modulated (PPM) acoustic pulses are difficult to detect since they carry information on delays so, assuring reliable information delivery mainly in shallow sea channels because of strong multipath and other interference sources/causes, large signal fluctuation and high noise level may be considered a timely challenge. This paper proposes a signal analysis based on the Wigner-Ville transform...
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