Bitstream Analysis Research Articles

Fast Clustering of Communication Signals

In the modern and digital battlefield, grasping the electromagnetic power of battlefield system is the key to deciding the outcome of the war, and accurate and comprehensive electromagnetic situational awareness is of great importance. Communication protocol analysis is a prerequisite for smart jamming in non-cooperative electronic countermeasures. The design of efficient jamming strategy for synchronous or networked signals can make up for the shortcoming of insufficient jamming power, solve the problems of remote and covert jamming, greatly reduce the cost of jamming equipment and improve the survivability of battlefield. Therefore, the rapid analysis of communication signal protocol has important military application value. Traditional protocol analysis requires parameter estimation layer by layer on the communication protocol, and bitstream analysis of the protocol word can only be carried out on the premise of solving modulation pattern identification and demodulation, interweave and scrambling parameter estimation and demodulation, channel decoding parameter estimation and decoding. This analysis method has the following disadvantages: long analysis cycle, strong expert dependence and high algorithm complexity. It is difficult to meet the demand of real-time analysis of unknown and flexible electromagnetic signals. In order to solve this problem, this paper proposes an idea of fast clustering of signal protocols in the physical layer by artificial intelligence method.

METHODOLOGY INTELLIGENT PROCESSING OF AERIAL PHOTOGRAPHS WITH THE RELEASE OF THE KEY FEATURES DECRYPTION

This paper developed a method compatibility code construction energetically significant structural unit with the requirement of the method of block symmetric encryption algorithm encryption to close the streaming video technology-based intra-breeding base of the video frame. The methodological basis for calculating the bit rate of the basic structural unit of the encrypted video frame. Schemes of forming bitmap to match the encryption key matrices. Also, encryption is a diagram of a significant structural unit of the base frame. A comparative analysis of the bitstream encoded structural unit in the bit stream of the original video fragment.

A No Reference Metric of Video Coding Quality Based on Parametric Analysis of Video Bitstream

A No Reference Metric of Video Coding Quality Based on Parametric Analysis of Video Bitstream

Design Assurance Strategy and Toolset for Partially Reconfigurable FPGA Systems

The growth of the Reconfigurable Computing (RC) systems community exposes diverse requirements with regard to functionality of Electronic Design Automation (EDA) tools. Low-level design tools are increasingly required for RC bitstream debugging and IP core design assurance, particularly in multiparty Partially Reconfigurable (PR) designs. While tools for low-level analysis of design netlists do exist, there is increasing demand for automated and customisable bitstream analysis tools. This article discusses the need for low-level IP core verification within PR-enabled FPGA systems and reports FDAT (FPGA Design Analysis Tool), a versatile, modular and open tools framework for low-level analysis and verification of FPGA designs. FDAT provides a set of high-level Application Programming Interfaces (APIs) abstracting the Xilinx FPGA fabric, the implemented design (e.g., placed and routed netlist) and the related bitstream. A lightweight graphic front-end allows custom visualisation of the design within the FPGA fabric. The operation of FDAT is governed by “recipe” scripts which support rapid prototyping of the abstract algorithms for system-level design verification. FDAT recipes, being Python scripts, can be ported to embedded FPGA systems, for example, the previously reported Secure Reconfiguration Controller (SeReCon) which enforces an IP core spatial isolation policy in order to provide run-time protection to the PR system. The paper illustrates the application of FDAT for bit-pattern analysis of Virtex-II Pro and Virtex-5 inter-tile routing and verification of the spatial isolation between designs.

No-Reference Quality Assessment for Networked Video via Primary Analysis of Bit Stream

A no-reference (NR) quality measure for networked video is introduced using information extracted from the compressed bit stream without resorting to complete video decoding. This NR video quality assessment measure accounts for three key factors which affect the overall perceived picture quality of networked video, namely, picture distortion caused by quantization, quality degradation due to packet loss and error propagation, and temporal effects of the human visual system. First, the picture quality in the spatial domain is measured, for each frame, relative to quantization under an error-free transmission condition. Second, picture quality is evaluated with respect to packet loss and the subsequent error propagation. The video frame quality in the spatial domain is, therefore, jointly determined by coding distortion and packet loss. Third, a pooling scheme is devised as the last step of the proposed quality measure to capture the perceived quality degradation in the temporal domain. The results obtained by performance evaluations using MPEG-4 coded video streams have demonstrated the effectiveness of the proposed NR video quality metric.

An optimal speed control scheme supported by media servers for low-power multimedia applications

In this paper, we present a new concept of dynamic voltage scaling (DVS) for low-power multimedia decoding in battery-powered mobile devices. Most existing DVS techniques are suboptimal in achieving energy efficiency while providing the guaranteed playback quality of service, which is mainly due to the inherent limitations of client-only approaches. To address this problem, in this paper, we investigate the possibility of media server supported DVS techniques with smoothing mechanisms. Towards this new direction, we propose a generic offline bitstream analysis framework and an optimal speed control algorithm which achieves the maximal energy savings among all feasible speed profiles for the given buffers. The proposed scheme enables us to compute the buffer sizes of feasibility condition, which are the theoretical lower bound of buffer size requirement for a given media clip. More importantly, our scheme facilitates practical applications from four aspects. First, it does not require feedback information on clients’ configuration. This renders our scheme particularly suitable for broadcast or multicast applications. Second, the speed profile based on buffer sizes of feasibility condition can provide satisfactory energy efficiency. Third, the required buffer sizes are so small that they can be met by most mobile devices. Fourth, additional side information (i.e., speed profile) of the proposed scheme is negligible compared to the size of media content. These properties solve the diversity issue and feasibility issue of media server supported DVS schemes. Experimental results show that, in comparison with the representative existing techniques, our scheme improves the performance of DVS significantly.