Blind identification method for coding parameter of return-to-zero Turbo code

Abstract

The invention discloses a blind identification method for a coding parameter of a return-to-zero Turbo code. According to the invention, after a length of an output block and an origin of an interlacing frame of a return-to-zero Turbo code are preliminarily determined by a linear transformation, a code rate of the return-to-zero Turbo code and a length of an RSC register of the return-to-zero Turbo code are estimated; an RSC generator polynominal is determined by constructing an identification sequence of a convolutional code; simultaneously, accuracy of the estimated code rate and the estimated length of the register are determined according to the identified RSC generator polynominal. On the basis of an interlacing length and an interlacing origin, wherein the interlacing length and the interlacing origin are obtained by an analysis, an interlacing sequence is recovered and obtained; and further, an interlacing relation in the return-to-zero Turbo code is finally determined by an exhaustive comparison method. The blind identification method for the coding parameter of the return-to-zero Turbo code provided in the invention is suitable for fields like intelligent communication and information processing and the like.

Description

technical field [0001] The invention relates to a method for blindly identifying encoding parameters of a zero-returning Turbo code in a digital communication system, and is applicable to the fields of intelligent communication, information processing, and the like. Background technique [0002] Turbo codes are widely used in modern communication. With the development of digital communication technology, more and more fields will have the demand for Turbo code blind recognition technology, and Turbo code blind recognition technology has become the frontier of today's communication research. [0003] The structure of Turbo code is as follows figure 1 as shown, figure 1 (a) is its general coding structure, and the commonly used classic structure is figure 1 As shown in (b) in, figure 1 The encoder in (b) is mainly composed of two recursive circular convolutional codes (RSCs) cascaded in parallel, and the convolutional encoders are connected by an interleaver. Generally, the...

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Problems solved by technology

[0006] But for the Turbo code of parallel concatenated convolutional code structure, do not see the relevant data of blind recognition aspect at present, the present invention mainly solves the blind recognition problem of return-to-zero Turbo code

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