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Multi-core processors are increasingly considered as execution platforms for embedded systems because of their good performance/energy ratio. Many applications implemented on multi-core platforms are safety- and some also time-critical. A critical issue for these applications is the reduced predictability of such systems resulting from the interference of different applications on shared resources...
Increasing the flexibility in spectrum access is a key to enhanced efficiency in radio spectrum utilization. Noncontiguous carrier aggregation (CA) is one enabling technology towards more flexible spectrum access, but can also lead to serious implementation challenges in terms of transmitter lin-earity. Especially when a single power amplifier (PA) is deployed for all carriers, serious intermodulation...
In this paper the two implementations of RObust Header Compression (ROHC), namely ROHCv1 (RFC 3095) and ROHCv2 (RFC 5225), are evaluated in terms of potential throughput increase and complexity for wireless IP networks and compared with each other for different multimedia streams. In order to compress the header information to a minimum, RoHCv1 has been proposed some years back and recently RoHCv2...
Heterogeneous wireless sensor network (HWSN) consists of sensor nodes with different ability, such as computing power and sensing range. Compared with homogeneous wireless sensor network, the design of protocols for such networks has to be more complex due to the energy constraint in order to prolong the lifetime of the network. As energy consumption mostly comes from the radio transmissions, bandwidth...
In this paper a new Hybrid Minimum Connected Dominating Set [MCDS] algorithm is proposed. This algorithm achieves energy efficiency by minimizing the Broadcast Storm Problem [1]. The minimum connected dominating set (MCDS) is widely used as a virtual spine for mobile ad-hoc networks. Here the MCDS is a mixture of Centralized and Distributed approaches based on Unit Disk Graph [2]. The node's mobility...
In the context of scalable video coding, we present in this paper a general prediction mechanism to combine temporal and inter-layer reference signals for compressing the enhancement-layer (EL). By utilizing the proposed combinations, the EL temporal prediction residue can be further predicted from a referenced base-layer (BL) temporal residue; or, the inter-layer prediction residue between EL and...
In the developing scalable extension of the HEVC/H.265 standard, a low-resolution baselayer picture may be used for predicting a higher resolution enhancement layer. This requires an upsampling process to generate the prediction, and this upsampling process is traditionally a linear and time invariant interpolator. In this paper, we consider an upsampling design that is both non-linear and content...
This paper introduces a new implementation of Shared Segment Protection (SSP) in mesh communication networks, in which a novel Integer Linear Program (ILP) is proposed under a reduced amount of routing information. In particular, the scheme of Distributed Partial Information Management with Sufficient and Aggregated Information (DPIM-SAM) [1] will be adopted for trading the optimality with the reduction...
This paper introduces new bandwidth guaranteed routing algorithms using remaining path holding time. The idea is to combine residual bandwidths with future available band-widths which are calculated based on holding time of routing paths to select next routes. The proposed algorithms have low complexity because only link bandwidths are considered and no critical computation is needed. They are tested...
Embedded vision is a rapidly growing and challenging market that demands high computation with low power consumption. Carefully crafted heterogeneous platforms have the possibility to deliver the required computation within the power budget. However, to achieve efficient realizations, vision algorithms and architectures have to be developed and tuned in conjunction. This article describes the algorithm...
2nd generation of integrated modular architectures (IMA) should be more generic, reconfigurable and scalable to be adopted for different aircraft platforms. Ultimately this leads closer to the concept of a distributed embedded real-time computer, which can host different critical and non-critical functions using few generic components, while ensuring deterministic sharing of common computing and networking...
Long Term Evolution (LTE) is considered the most promising cellular system able to support the growing demand of multicast services (e.g., IPTV, video streaming) over mobile terminals. The design of effective strategies for the management of these applications is still an open issue, especially in scenarios where several multicast streams are simultaneously transmitted in a cell. In this paper we...
To cope with the ever increasing demand for bandwidth and increasing number of users, future wireless networks will be designed with the radio resource allocation techniques able to get good performance with low complexity and feedback. In this paper we study an allocation problem for OFDMA networks formulated with the objective of minimizing the load of each cell in the system or maximizing the number...
Resource management in heterogeneous wireless networks has been approached from various angles by the research community. The complexity of the network and the heterogeneity of clients make the conclusive comparison of the various resource allocations challenging. This work introduces superBS, an approach defining a theoretical optimal resource allocation that adheres to the required resource management...
Phase compensation prefiltering is experimentally investigated for multipath channels over the frequency band spanning 2–12 GHz, a topic which to the best of our knowledge has not been studied in the literature on ultrawideband (UWB) systems. We assess the capabilities of PC over realistic Line-Of-Sight (LOS) and Non-Line-Of-Sight (NLOS) UWB channels regarding multipath suppression. The “RMS delay...
We study the reference signal time difference (RSTD) performance and implementation of scalable positioning reference signal (PRS) bandwidth in long term evolution (LTE). Limited number of reference signal symbols for performing RSTD measurements reduces the quality of the timing and position estimations. To overcome this limitation, we propose to share the PRS transmit port with one of the cell-specific...
The zoom FFT (ZFFT) has been utilized in various digital signal processing systems, it is used when a fine spectral resolution is needed within a small portion of a signal's overall frequency range. It has been implemented in different fields and for different applications. This paper presents an implementation method of the ZFFT approach to estimate the spectral peak in the FMCW radar using a field...
In the paper we present integer programming (IP) optimization models for flexgrid elastic optical networks (EON). We consider several different basic assumptions regarding flexibility of EON that lead to a variety of IP formulations differing in precision and complexity. As usual, detailed models aiming at precisely describing technological aspects of EON suffer from tractability issues resulting...
One important cause of energy waste in networks is over-provisioning: this paper presents novel necessary and sufficient conditions which can be employed for dynamically adapting network provisioning capacities when performance indicators fluctuate. We develop a novel formulation, based on the application of a theorem by Greenberg, demonstrating how the dynamic detection of over-provisioning in a...
Orthogonal Frequency Division Multiplexing (OFDM) is a promising candidate for Multi-Carrier (MC) transmission. The combination of OFDM and Code Division Multiple Access (CDMA) referred to as OFDM-CDMA has drawn much interest in wireless communication systems. Inspite of its various beneficial qualities, the drawback includes the requirement of Cyclic Prefix (CP) to avoid interference between OFDM...
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