The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
Vehicular Ad-hoc NETwork (VANET) simulation is crucial for the development of new protocols and applications. Even though real-world experimentation is the de facto benchmarking solution for any of these, the first evaluations must be made through simulation, due to the ease of changing parameters and scenarios. In this work, we propose a statistical channel model for VANET simulation based on the...
In this paper, we propose polarization multiplexing as an ideal candidate for next-generation GNSS systems like GPS and Galileo. After describing in detail a new model of MIMO LMS channel, we show simulation results for the proposed scheme concatenated with a state-of-the-art Turbo code. A slow and a fast scenario are considered and both show that PM offers a better performance than other schemes...
Railway signaling communication is a kind of safety-related processing and the information has to be delivered safely. RSSP-1 Railway Signal Safety Protocol is a safety communication protocol which aims at protecting the message transmission between railway signaling safety-related equipment in closed transmission systems. CPN is suitable for the verification of the correctness and safety characteristics...
In this paper, we investigated the influence of asymmetric on TCP over HFC-based networks and related methods to improve the TCP performance. Then, a scheme called Modified Adaptive SACK Filtering is proposed to improve the TCP performance by adjusting the size of the block information in SACK option according to the real-time characteristics of network. Furthermore, based on the fact that the forward...
In the existing SCTP, an association is established by exchanging four initial chunks during four-way handshakes. What is serious is that the association establishment phase has to be backed off exponentially once any initial chunk gets lost or suffers random bit errors. This will result in a severe performance degradation of SCTP over wireless networks due to a very long waiting time. In order to...
In this paper, a nonparametric approach for time-of-arrival (TOA) estimation in impulse radio ultra wide band (IR-UWB) signals is proposed. It exploits the idea of nonparametric detection, which is always utilized in radar systems for detecting targets in a background of noise with unknown statistical properties. The proposed nonparametric TOA estimator is obtained by basing a well-known generalized...
This paper studies feedback based instantly decodable network coding with the aim of minimizing decoding delay per transmission over wireless broadcast erasure channels with memory. We model such channels with a Gilbert-Elliott two-state Markov model with good and bad states. We first present a weighted sum generalized instantly decodable network coding (G-IDNC) scheme, where the aim is to service...
A new interference management strategy is proposed for device-to-device (D2D) underlaying cellular networks without the exact location information of cellular user equipments (CUEs). We consider the case where one D2D pair reusing the same channel with cellular users, both uplink and downlink. The base station (BS) only knows the distances that D2D user equipments (DUEs) and CUEs away from BS, instead...
The Ultra Wide Band (UWB) channel of Body Area Networks (BAN) is characterized by its various paths containing signal energy. The performance of an energy detection receiver (ED) is determined by its integration period which must be defined appropriately to aggregate enough energy, while avoiding the collection of too much noise. A short integration period scaled at the impulse time is a good way...
The hidden secret message capacity, stego-image quality and security are three important conditions for data hiding technology. According to these requirements, an effective security protection with high hiding capacity steganographic method based on general multi-EMD is proposed in this paper. The major contribution of this method is not to need more complicated embedded steps when the secret data...
We introduce a new concept of communication technology called point-and-link communications, which aims to bring convenience to the users of D2D communications in LOS situations. We also propose a new beamforming scheme called Random Jitter Beamforming (RJBF), which is a key component in implementing point-and-link communications. RJBF is designed to eliminate the harmful effect of the side lobes...
A new 6D mesh/torus (Tofu) interconnect is implemented in the K Computer for achieving a performance of more than 10 petaflops. As expected, among its many interesting properties, such interconnect has large variations of latencies for communications within a node-group (intra-node-group) or between them (inter-node-group). Inspired by their works while recognizing the superior features of the recently...
In the last years, Ultra Wideband (UWB) systems have received growing interest for their low-power consumption and low-complexity implementation. Because of the ultra-short emitted waveforms nature, timing acquisition presents a most important challenge for achieving good performance. In this paper, in order to address this task and to achieve this goal, we design and test a novel timing acquisition...
This paper presents a power line communications (PLC) receiver in ICs with emphasis on robustness. The PLC receiver intends to control internal logic values of ICs through power pins. It employs a differential Schmitt trigger to increase noise immunity and tolerate supply voltage fluctuations. The receiver is designed and laid out in 0.18 µm CMOS technology. Post-layout simulation results show that...
Reversible data hiding has its attractions and possible drawbacks in researches, and it has the potential to extend to digital rights management (DRM) applications. For reversible data hiding, secret information can be hidden into original multimedia content, and the content with hidden data can be transmitted to the receiver. After reception, receiver employs corresponding algorithm to decode the...
In parallel communication the cost as well as complexity of the system increases due to simultaneous transmission of data bits on multiple wires. Serial communication alleviates this drawback and emerges as effective candidate in many applications for long distance communication as it reduces the signal distortion because of its simple structure. This paper focuses on the VHDL implementation of UART...
This paper describes a ΔΣ modulation based ranging method for the IR-UWB radar system. To relax the phase resolution requirement of the delay line in the receiver, two coarse timing boundaries of the delay line are used to form a bilevel quantizer which can be the part of a 1-bit ΔΣ oversampling TDC. Also, a digital phase rotator circuit is designed to provide an unlimited phase capture range. Simulation...
Localization is a vital foundation in Wireless Sensor Networks (WSNs). However, most previous localization methods assume an idealistic radio propagation model that is far from reality. This will lead to inaccurate localization, since unknown nodes cannot receive enough location messages under the radio irregularity model. In our previous work “LMAT”, we solved the path planning problem of the mobile...
This paper studies the achievable performance of a single-antenna spectrum-sharing system. Due to limited cooperation between secondary users (SUs) and primary users (PUs), perfect channel state information (CSI) related to the PUs is hard to obtain for the SUs. Therefore, we assume the secondary transmitter and receiver have only statistical CSI from the secondary transmitter to the primary receiver...
Multiprocessor systems have been popular for their high performance not only for server markets but also for computing environments for general users. With the increased software complexity, networking overheads in multiprocessor systems are becoming one of the most influential factors in overall system performance. In this paper, we attempt to reduce communication overheads through a data packet...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.