Aiming at the problems of low efficiency and low accuracy of protocol analysis in the actual network environment with large real-time traffic and wide use of unknown protocols, we propose a novel fast format classification and parsing approach based on multiple progressive resolution (FCPMPR). Firstly, binary message is scanned by experience window, and the message is compressed by distribution entropy and word frequency. Secondly, for avoiding excessive information loss caused by dimensionality reduction, the Simhash algorithm is adjusted to map the indefinite length packets to fixed-length fingerprint. And the rapid classification of packets is realized by fingerprint distance. Then in the same type of message, a domain-supported dynamic time warping (DDTW) algorithm is proposed to match the message feature structure with different protocols and marking density centers. Finally, the over-divided feature structures are combined to realize structure and state words recognition. Experiments show that the proposed algorithm achieves both accuracy and time complexity effectively based on multi-layer progressive method.
KEYWORDS: Telecommunications, Satellites, Satellite communications, Data communications, Receivers, Human-machine interfaces, Visualization, Satellite navigation systems, Navigation systems, FDA class II medical device development
Beidou satellite communication system has the function of short message transmission. The traditional short message "broadcast" function is to use Beidou command aircraft to bind with subordinate end users for "broadcast", which has poor timeliness. This paper designs a short message "broadcast" system using Beidou multi card machine, and carries out data processing at both the sending end and the receiving end, so that it can adapt to various external systems. Through practical verification, when the number of user terminals is not too many, the success rate and timeliness are greatly improved compared with the traditional system.
When the traditional LT code is used for encoding and decoding, if there is no encoded packets with degree 1 in the remaining encoded groups, the decoding will stop and the decoding cannot be continued. That will affects the decoding efficiency. For this reason, this paper proposes an improved enhanced decoding method. When BP decoding stops, the remaining coded packets will be decoded using the secondary decoding method, which can improves the success rate of decoding.
Access to the requested content is limited to institutions that have purchased or subscribe to SPIE eBooks.
You are receiving this notice because your organization may not have SPIE eBooks access.*
*Shibboleth/Open Athens users─please
sign in
to access your institution's subscriptions.
To obtain this item, you may purchase the complete book in print or electronic format on
SPIE.org.
INSTITUTIONAL Select your institution to access the SPIE Digital Library.
PERSONAL Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.