A New Method for Blind Recognition of the Initial State of Synchronous Scramblers When Located after the Channel Encoder

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GHAZI MAGHREBI S.; ALEMI H.

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Journal Paper

Paper Information

Journal: JOURNAL OF ELECTRONIC AND CYBER DEFENCE Year:2021 | Volume:9 | Issue:1 (33) Page(s): 19-27

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Information Journal Paper

Title

A New Method for Blind Recognition of the Initial State of Synchronous Scramblers When Located after the Channel Encoder

Author(s)

GHAZI MAGHREBI S. | ALEMI H. | Issue Writer Certificate

Keywords

Blind RecognitionQ1

Synchronous ScramblerQ1

Initial StateQ1

Channel EncoderQ1

Abstract

The scrambler block is one of the most commonly used blocks in digital communication protocol design. This block is used to randomize the bit string and usually is used after the source encoder or after the Channel Encoder. In blind detection this block, is assumed to be located after the source encoder or after the Channel Encoder. LFSRs are often used to design linear scramblers. Therefore, scramblers are defined by usage of feedback polynomials and Initial States. In previous works, the Initial State of the scrambler after Channel Encoder has been identified, but under some circumstances, these algorithms cannot provide proper response. In these conditions, to identify Initial State of the scrambler, a full search method may be used which takes a long time. In this paper, a new algorithm for Initial State of scrambler detection, after Channel Encoder, is presented. The proposed algorithm is able to identify the Initial State of scrambler in the cases that other algorithms cannot do anything. The new algorithm also reduces the search space and as a result, it need much less time for the identification process.

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