The telecommunication systems development based on single-mode and multimode optical fibers is aimed at the rapidly increasing demand for bandwidth not only transport networks, but also intra-site data centers networks, cloud computing, and web servers. The solution to this problem is provided by the signal processing technologies complexity. In this case, the requirements for the receiver complexity can be reduced by using technologies to combat signal distortion due to equalizers together with FEC. There was known that the use of FEC based on permutation decoding in relation to the RS codes provides a significant gain in the data processing speed by the receiver due to the use of a cognitive procedure for searching the generating matrix of the equivalent code. The paper shows that the use of this technology can be successful in solving another important task related to minimizing the timing attacks consequences on the protection confidential information system. This is due to the active development of quantum computers and the problems of post-quantum cryptography that arose on this basis. The essence of leveling the timing attacks risks is to equalize the time spent on processing vectors of redundant BCH or RS codes. The use of permutation decoding fully matches these requirements by replacing the algebraic system of detection and errors correction in the data on the procedure of lexicographic search for the desired result. It is shown that the data processing time when using permutation decoding in conjunction with the cognitive search for the decoding result varies slightly.
A method of improving the performance of non-binary redundant code decoders in a coherent network system using forward error correction is considered. It is proposed to use permutation decoding which in contrast to the known methods of processing error-correcting codes has a number of deterministic parameters. Such parameters in the procedure of decoding code vectors can be determined in advance and included in the cognitive map of the decoder. The using of cognitive map data dramatically reduces the amount of matrix calculations in the permutation decoding of system, which contributes to the performance of the decoder. This contributes to the harmonization of high-speed data flow to the input of the decoder of the optical system on the physical level with relatively limited processing capabilities of the processors on the data link layer. The methods of reducing the memory size of the cognitive map of such decoder and fast search of reference matrices of equivalent codes through the use of lexicographic navigation are considered.
The fiber optic communication systems are the basis for ensuring global communication of the modern society. High bandwidth and low noise are the main advantages of the indicated class of communication systems. Nevertheless, fiber optic communication systems have a series of confounding factors arising because of the temporary operation, and due to the used fiber optic cable. To compensate for such manifestations it is necessary to use modern error-correcting codes and their decoding methods. In the work proposed to use polar codes and the lexicographic method of decoding.
The main advantages of polar codes are the ability to achieve bandwidth, binary symmetric channel of communication, high adaptation to the end-user and acceptable level of correcting capabilities. In the based lexicographic approach is the method of clustering of the space of allowed codewords. Technology of division clusters or lexicographic ordering of the space of allowed codewords of error-correcting binary block codes implements non-algebraic approach to the processing of code vectors of the receiver, allowing to reduce the computation cost and to provide energy gain.
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.