A Scrambling Code Cancellation Method Aiming at Combination of Channel Code and Scrambling Code
A technology of channel code and identification method, which is applied in the direction of digital transmission system, electrical components, and error prevention, etc., and can solve the problems of limiting non-cooperative communication to information identification understanding, code identification, and inability to identify data scrambling codes.
Inactive Publication Date: 2017-04-05
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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[0007] For the first data encapsulation format, use the existing channel encoding identification method to perform channel encoding identification and decoding on the received data, and the original information can be obtained; for the second data encapsulation format, it does not meet the conditions of the existing scrambling code identification method, With the existing scrambling code identification method, it is impossible to perform scrambling code identification and channel coding identification on the channel coded and then scrambled data
Therefore, the existing scrambling code identification methods limit the understanding of information identification in non-cooperative communication
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[0026] Example process such as image 3 Shown:
[0027] Step 1: Carry out framing to the data data that length is L after interception and demodulation, data=(data 1 ,data 2 ,...,data L ):
[0028] 1-1 Perform (-1) on the data data a Transform (the value of a is the data bit value 0, 1), change 0 to 1, and 1 to -1;
[0029] 1-2 frame header length search range head_length is from L 1 to L 2 , among them, L 1 >L 2 , head_length from L 1 Start to take value, L 1 is the initial search length, L 2 is the termination search length;
[0030] 1-3 Set the frame header to be tested head=(data 1 ,data 2 ,...,data head_length ), and the frame header starting position to be measured (the starting position is location=1) is put into the frame header starting position vector Location;
[0031] 1-4 The rest of the data (data head_length+1 ,data head_length+2 ,...,data L ) from position i (the initial value of i is head_length+1) to judge whether i≤L-head_length+1 is satisf...
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The present invention provides a scrambling code cancellation method aimed at combining channel codes and scrambling codes, comprising the following steps: performing frame division processing on demodulated data; counting the number of frames under each frame length; Two frames are extracted from the set with the number of frames greater than 1, and the bearer data of the two frames are extracted and put into the sequence S1 and the sequence S2 respectively; XOR the sequence S1 and the sequence S2 to obtain the sequence with the scrambling code removed; based on removing The sequence of the scrambling code is identified by the channel code identification method. The invention utilizes the properties of the same frame scrambling position and the same scrambling sequence to cancel the scrambling code, and proposes a scrambling code canceling method in which the channel code and the scrambling code are combined. Then, according to the property that the codewords obtained by XOR between codewords of the channel codes still belong to the codewords in the original codeword space, the existing channel code recognition method can be used to identify the channel code parameters.
Description
technical field [0001] The invention relates to the field of non-cooperative communication and the field of identification and descrambling of synchronous scrambling codes, in particular to the scrambling code canceling technology of combining linear block codes or convolutional codes with scrambling codes. [0002] technical background [0003] In order to correct the errors introduced in the transmission process and encrypt the transmitted information, channel coding and scrambling are usually applied to the communication system at the same time, and synchronous scrambling is a commonly used scrambling method. For cooperative communication, the data encapsulation process (such as channel coding, scrambling parameters and positions, etc.) is known, and the partner only needs to perform frame synchronization on the demodulated data, reverse data encapsulation and analysis, and finally restore the information. [0004] The data encapsulation format of the communication system ...
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IPC IPC(8): H04L1/00
Inventor 高晓霞廖红舒魏平
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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