An error code element deleting method for a CCS-RS cascade code

Abstract

The invention provides a CCSK-RS cascade code error code element deleting method. The method for deleting the error code element of the RS cascade code comprises the following steps of: calculating acorrelation peak ratio of each signal-to-noise ratio simulation point, and not deleting the code element when the correlation peak ratio is less than a threshold; otherwise, deleting the code elementduring RS decoding, taking the average value of the optimal threshold values of the signal-to-noise ratio simulation points as the optimal threshold value corresponding to the RS codes, calculating aCCSK correlation peak ratio R after receiving signals, and not deleting the code element during RS decoding; otherwise, deleting the code element during RS decoding, and performing error correction decoding. According to the invention, decoding is carried out under the influence of noise; code elements causing detection errors due to noise can be detected and deleted according to the correlation peak ratio; therefore, the correct probability of RS decoding is effectively improved, the signal receiving sensitivity of a receiver is improved, code elements subjected to strong interference can beeffectively detected and deleted under the condition of strong interference influence, the interference influence is eliminated, and the anti-interference capability of the system is improved.

Description

technical field [0001] The invention relates to the field of communication systems using CCSK-RS concatenated codes, in particular to the decoding process of received signals. Background technique [0002] In many special communication systems for sending burst messages, the encoding method often adopts a short code concatenated encoding method in which the inner code is an error correction code and the outer code is a spreading code. For example, the Link16 data link waveform of the U.S. military adopts the encoding method that RS(31,15) / RS(16,7) is encoded as the inner code and 32-bit cyclic shift keying (CCSK) code is the outer code. For RS coding, its own erasure ability is stronger than error correction ability. For example, RS(31,15) encoding supports deletion of 16 error symbols at most, or supports correction of 8 error symbols at most; RS(16,7) encoding supports deletion of 9 error symbols at most, or supports correction of 4 error symbols at most Error code eleme...

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Problems solved by technology

[0003] In order to overcome the deficiencies of the prior art, the present invention provides a method for deleting error symbols of CCSK-RS concatenated codes, based on the CCSK correlation value, for a specific RS codec, CCSK codec and modulation mode, through simulation selection Correlation value threshold is used to set the error symbol deletion threshold, detect and delete symbols affected by interference or large noise, thereby improving the correct probability of RS decoding, this method is suitable for the joint demodulation and CCSK decoding

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