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.
Packet classification can be applied in network security, QoS, routing, network load balancing, bandwidth sharing etc. Algorithms of packet classification are categorized into either hardware-based or software-based solutions. Nowadays packet classification implementations are inefficient in IPv6 network environment because much longer address fields have to be processed. In this paper, we propose...
Accurate radio channel estimation is necessary for efficient wireless communications. This paper proposes a novel Kalman filter algorithm using basis expansion models (BEMs) of the channel gains to accurately estimate fast fading channels. The channel state for finite duration blocks is summarized in terms of BEM coefficients. The dependency between channel blocks is described with a second-order...
This paper presents an improved bit-edge equalization (BEE) method for mitigating intersymbol interference (ISI) in high-speed backplane applications. Using a least-mean-square (LMS) adaptive algorithm as a receiver (RX) error convergence engine, the proposed BEE method is based on equalizing only the edges of data bits with an adjustment of LMS error derivation points, which in turn changes the error...
In most sensor network applications, the information gathered by sensors will be meaningless without the location of the sensor nodes. Node localization has been a topic of active research in recent years. Accurate self-localization capability is highly desirable in wireless sensor network (WSN). This paper proposes a new centralized localization algorithm for WSN. Given the distances between a sensor...
In a recent contribution [1], we have provided a comparative analysis of various optimization algorithms, which can be used for atomic location estimation, and suggested an enhanced version of the steepest descent (ESD) algorithm, which we have shown (with preliminary results) to be competitive with some other distributed localization algorithms in terms of estimation accuracy and numerical complexity...
As one of the most important applications over the Internet, HTTP traffic is experiencing a fast development period in these few years. The characteristics of the HTTP traffic have been changed due to the introducing of multimedia into web browsing application. One of the most remarkable multimedia pages is the video page which is becoming more and more popular with the web browsing users. In this...
A distributed differential space-time-frequency (STF) coding scheme is proposed for single-relay assisted cooperative communication networks over frequency-selective fading channels. Using full diversity rotation and Cayley transformation at the source node, our proposed scheme can achieve both spatial and multipath diversity without any instantaneous channel state information at the destination node...
This paper presents the design and implementation of a digital audio broadcasting (DAB) signal analyzer. It can be used to test transmitter products or to learn the DAB technique. Compared to conventional DAB receivers, it provides more information of the signal and it is much cheaper than professional analyzers. Several key blocks are described in details such as synchronization and offset correction...
In the reactive routing algorithms of mobile ad hoc networks (MANET), preemptive routing method tries to warn the source node and to tell it to change route in time before a link is about to break. This method alleviates the problem from packet losses, and shortens the delay of route change after a route failure. However, it also decreases the number of route error packets which play an important...
Wireless mesh networking is envisioned as an economically viable paradigm and a promising technology for a wireless backbone. It should provide quality-of-service (QoS) guarantees the same as or similar to those offered by the legacy wireline backbones. A key factor in designing protocols for WMNs is to exploit its distinct characteristics such as immobility of mesh routers and less-constrained power...
The term "community network" has been used in different meanings by the representatives of different disciplines involved. Nevertheless, multidisciplinary research may need more open theoretical approaches. This paper brings together the several "worlds", first of all sociologists and communication specialists, by proposing a socio-technical relational framework. It consists of...
A new resource allocation scheme for joint routing and subcarrier allocation is proposed in the orthogonal frequency division multiple access (OFDMA)-based relay system. The objective of the scheme is to maximize the system throughput while guaranteeing the user QoS (quality of service) requirements. The optimization problem is tackled in a graph-theoretic perspective. The simulation results reveal...
In this paper, a mixed granularity frequency hopping method for single carrier multi-user access system is introduced. This frequency hopping method solves the problem of mixed bandwidth granularity localized transmission in a single carrier system. The main concept is using the predefined mode to guarantee the orthogonal frequency hopping pattern and single carrier property.
In this paper, a digital rights management (DRM) system based on smart card was proposed for digital cinema (D-Cinema). A DRM architecture was established which can be applied for application models of D-Cinema, such as register of subscriber, distribution of encrypted digital movie, purchase, authorization, play right and rights transfer. A security protocol for application models of D-Cinema was...
In this paper, we proposed a general framework for designing a good algorithm based on the optimal quantization-based steganography (QBS). After the description of the concepts of QBS, we present an implement of simple QBS(SQBS) on the pair value difference domain. In our implement, we adopt the weighted sum of the distance between the cover and stego signals to measure the distortion, and construct...
The energy constraint and the low power communication requirements amplify the significance of the energy efficient routing protocols in wireless sensor networks (WSNs). The primary aim to design a routing protocol for WSN is to improve the energy efficiency and prolong the network lifetime. In this paper, we propose a cluster-chain routing protocol (CCRP), which adopts a more balanced cluster-head...
For wireless ad hoc networks with random access, we propose an optimal rate allocation and power control mechanism. First, a network utility maximization problem and an energy minimization problem are given in this paper. Using multiobjective optimization theory, we then combine the two conflicting optimization problem together into a new optimization problem. Finally, the new optimization problem...
In the paper, we propose a hybrid overlay multicast architecture (called RSOMA) to cascade existing surveillance information islands to solve video transmission and a large number of users accessing under heterogeneous network environment. Through connecting the pre-deployed streaming delivery servers in existing system and organizing them into a mesh-first overlay backbone service domain, video streaming...
Orthogonal frequency division multiplexing convolutional multi-code multiplexing (OFDM-CMM) has been proposed to achieve notable coding gain and diversity without loss of spectral efficiency. However, the complexity of maximum likelihood sequence estimation (MLSE) grows exponentially in the number of parallel streams. This detection algorithm is prohibitive when the number of parallel streams is large...
In wireless ad hoc networks, if we design the cooperative diversity method during download process to utilize the wireless medium and common files source, the file download performance would be improved significantly. In this paper, we propose novel protocols, opportunistic downloading protocol (ODP) and opportunistic DF broadcast downloading protocol(ODFBP). Our new protocols could adaptively work...
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.