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Applications operating over airborne networks are known to perform quite sub-optimally. Transmission control protocol (TCP) based applications often experience very low data throughput, while the user datagram protocol (UDP) based applications suffer high packet loss as well as out-of-order delivery. This is due to the high bit error rate (BER) nature of the wireless links and the high mobility of...
Future satellite-based packet networks (FSPN) will utilize a request/grant MAC protocol referred to as demand assigned multiple access (DAMA) for uplink allocations. DAMA is conceptually similar to bandwidth-on-demand (BoD) protocols used in terrestrial networks, such as 802.16 and DOCSIS, which flexibly share total bandwidth according to actual loads and usage policies. However, unique characteristics...
The US military will use digital video compression for many different operations and applications. System requirements result in the need to transmit video streams within limited bandwidth, and often over harsh transmission environments. To deliver video with sufficient quality, the most modern video encoders and decoders (codecs) need to be employed with parameters optimized for high compression...
Parallel efforts are underway in the frequency management and the radio and waveform design communities to support data communications over HF radio channels wider than conventional 3 kHz allocations. In this paper, we analyze the potential performance of such ??wideband?? HF data channels as a function of spectrum allocation, coding, channel characteristics, and waveform overhead.
Friendly force tracking systems (FFTS) are the lowest echelon of command and control information systems (C2IS) in any army command and control architecture. Their initial goal is to provide near real-time information about own troops position. However, in foreseeable current empty battlefields as well as in asymmetric confrontations at least two extra functionalities are required: 1) sensor integration...
One of the major QoS goals for future battlefield networks (FBN) is to ensure multi-level precedence and preemption (MLPP). Ensuring MLPP is difficult, partly due to the networking architecture for FBN which consists of wired ??red?? network connected by encrypted wireless ??black?? network. The security requirements for FBN do not allow passing information from black to red networks. So when congestion...
Emerging hybrid satellite communications and wireless network architectures support high bandwidth services and applications for tactical users. In this paper we propose a cross- layer design approach focusing on physical layer interaction on the application layer using an OPNET simulation environment. This paper studies the effect of fading on dynamic resource allocations and the impact of rain fading...
In this paper, we present an automated region-of-interest-based video coding system for use in ultra-low-bandwidth applications. Region-of-interest (ROI) coding methodology specifies that targets or ROIs be coded at higher fidelity using a greater number of available bits, while the remainder of the scene or background is coded using fewer bits. This allows the target regions within the scene to be...
The Defense Information Systems Agency (DISA) has been supporting dissemination of airborne sensor Full Motion Video (FMV) since the inception of the Global Broadcast Service (GBS). DISA actively investigates emerging video technologies and participates in DoD and industry conferences related to FMV. In 2006, DISA increased its involvement in FMV dissemination through support to several US Central...
As advanced communications techniques reach capacity, have reduced performance or system availability, or become unusable, the warfighter must have a reliable, high-capacity communications system in place and standing ready to supplant the degrading systems. Events in the recent past have shown satellites vulnerable to a number of ills or potential problems that could be debilitating. This paper addresses...
In this paper, we address the problem of collaborative video caching in mobile ad-hoc networks. We consider network portraying static video server with wired interface to gateway node that is equipped with wireless interfaces, other nodes are requiring access to the video streams that is stored at video server. In order to reduce the average access latency as well as enhance the video accessibility,...
In this paper, we discuss a novel priority assignment and packetization scheme to transport H.264/AVC video packets over wireless networks. Specifically, we discuss a comprehensive packet priority assignment scheme for unequal error protection, followed by the use of adaptive network abstraction layer unit (NALU) sizes and NALU fragmentation schemes. These schemes use the standard-compliant decoder...
This paper proposes a rateless coding for efficient MPEG video transmission over loss prone networks. An MPEG video stream is comprised of various frame types, which contribute differently to the displayed video quality. We employ rateless codes with unequal error protection (UEP) property to have more protection on frames with higher influence on the quality of the displayed video. We define protection...
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