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In this paper, we propose a routing protocol in an ad hoc network that ensures timely delivery of real-time data packets. This is achieved by carefully accessing the resources available to a route before a session is admitted along that route. Each link in the route is checked for sufficient bandwidth not only for the new session to be admitted but also for the sessions that are already using that...
On QoS of live broadcast, proposes an congestion control strategy based on multicast transmission for terminals, i.e. the sender adopts RTP/RTCP adaptive control strategy, and variable increase and decrease method is used to adjust sending rate, while the receiver sets the buffer to adjust the data to play order of playback and to maintain the matching rate and effective bandwidth at the same time...
A vector matching processor with memory bandwidth optimizations is proposed to achieve real-time matching of 128 dimensional SIFT features extracted from VGA video. The main bottleneck of feature-vector matching is the off-chip database access. We employ the locality sensitive hashing (LSH) algorithm which reduces the number of database comparisons required to match each query. In addition, database...
Dynamic voltage/frequency scaling (DVFS) and adaptive body biasing (ABB) have shown to effectively reduce dynamic and leakage energy consumption in real-time embedded systems. Although these techniques exploit the slack time on a given task ordering, the task ordering may not provide a slack time distribution that DVFS/ABB can benefit from and this can limit the potential energy saving such techniques...
Providing Quality of Service in the Ad hoc networks is one of the topics that have received a lot of attention recently. The most common QoS solution presented in the literature is the reservation method. It consists of making resources reservation for the flows which have QoS requirements. In this paper, we propose a novel reservation approach for the TDMA-based Ad hoc networks. Our proposal is based...
The advantage and weakness of mobile agent migration strategy have an important impact on user's task that the agent completes. The agent flooding mechanism is proposed to collect network status information duly, and a new kind of traveling agent is included into the mobile agent system to improve the real-time performance, and self-adaptation ant colony algorithm is used to search the path, and improves...
This paper focuses on an environment of more than one proxy server (called SARF) that serves homogeneous or even heterogeneous client preferences for streaming of real time or stored video flows. Under a hierarchical tree topology system of servers the users can access to different video sources and files though the tactical network. Camera sensors generate a huge amount of data compared to scalar...
Realizing the software based on MIDI (Musical Instrument Digital Interface), with which MIDI instruments geographically distributed over Internet could be real-time played or synthetic performed. By access local MIDI input instruments to obtain signals, the software can help access local MIDI input instruments to implement local play. At the same time it can also obtain MIDI message in real-time and...
The demand for real-time communication over wireless LANs is increasing. In the infrastructure mode of IEEE 802.11, wireless terminals, or stations (STAs), share one access point (AP). Since TCP congestion control increases the congestion window size until packet loss occurs, TCP communication takes excessive bandwidth from other communications. Then, TCP communication affect the communication quality...
A challenge towards Quality of Service (QoS) is to provide uninterrupted network services in the event of link failure. Path protection is a promising solution by employing a link-disjoint secondary backup path to protect the primary path to ensure the continuity of network services. Existing path protection schemes are classified into dedicated-path protection (e.g., 1+1 protection) and shared-path...
MPLS is a core technology for nowadays and future networks, and must meet the needs of real-time applications for which network survivability is critical. Dynamic alternative routing has already been proposed several times to increase MPLS network performance. In this paper, a proposal of a protection scheme to be used with dynamic alternative routing is presented and its performance is evaluated...
Ubiquitous computing platform enables interactions among users, applications, and services through wireless devices. People nowadays always connect to the Internet while moving. Although portable device can provide high-speed connectivity, a user may move in areas with weak signal or thin bandwidth. In this paper, a ubiquitous computing platform is designed for quality control of multimedia and data...
This paper presents analytical models to dimension the transport bandwidths for the S1 interface in the Long Term Evolution (LTE) Network. In this paper, we consider two major traffic types: elastic traffic and real time traffic. For each type of traffic, individual dimensioning models are proposed. For validating these analytical dimensioning models, a developed LTE system simulation model is used...
Recently, all-IP intelligent video surveillance/door system is one of the attractive and important applications in the world. However, because the current Internet architecture cannot provide sufficient QoS for such kind of real-time applications, the performances of them are often poor under congested or interfered Internet environment. When Internet traffics are congested or interfered, the frame...
A proxy server is presented and divides the streaming media service that users access to in the 3G network into different types. According to the characteristics of service types, the proxy server uses different segmentation prefetching to improve the efficiency. Meanwhile, this paper introduces the assembly line technology which improves the speed of the streaming media distribution, effectively...
Next-generation real-time systems will be increasingly based on heterogeneous MPSoC design paradigms, where predictability and performance will be key issues to deal with. Such issues can be tackled both at the hardware level, by embedding technologies such as TDMA busses, and at the OS level, where suitable scheduling techniques can improve performance and reduce energy consumption. Among these,...
In an electronic detecting system, how to capture non-cooperative signal at low SNR is always a challenging work. This paper puts forward a real-time algorithm named Shifted-N points-Correlation Algorithm for detecting LFM (Linear Frequency Modulation) pulse signal based on digital autocorrelation. Applying a gliding window of proper length to truncate infinite signal into finite length, then calculating...
We describe the Lightweight Communications and Marshalling (LCM) library for message passing and data marshalling. The primary goal of LCM is to simplify the development of low-latency message passing systems, especially for real-time robotics research applications. Messages can be transmitted between different processes using LCM's publish/subscribe message-passing system. A platformand language-independent...
We designed and built a 16-channel NIM module acting as preliminary analog processing of the signals to be converted by sampling ADCs for the CHIMERA 4π multidetector digital pulse shape acquisition system. The main functions of the module are: i) a second order anti-aliasing filter with two programmable cutting frequencies, ii) a programmablegain amplifier to cope with the full dynamic range of the...
60 GHz technology has been proposed recently for multi-Giga-bit/s access within different application scenarios, e.g. in crowded multi-user public transportation (PT) environments. Hence, channel sounders that are used to investigate multipath propagation and multi-user access techniques including spatial diversity and beam-forming in time-variant shadowing environments require ultra-wideband (UWB)...
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