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Quick soft bit descrambling method used in communication

A soft-bit, bit-based technology, applied in the field of soft-bit fast descrambling, to achieve the effect of simple implementation and improved real-time processing efficiency

Active Publication Date: 2013-12-11
WUHAN POST & TELECOMM RES INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although scrambling and descrambling is only a link in the physical layer processing process, a relatively large improvement in processing time is required

Method used

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  • Quick soft bit descrambling method used in communication

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Experimental program
Comparison scheme
Effect test

Embodiment

[0038] Embodiment comprises the following steps:

[0039] Step1: Read 8-bit scrambled bits c 7 c 6 c 5 c 4 c 3 c 2 c 1 c 0 , which is the same scrambling bit as the sending end, used as descrambling bit;

[0040] Step2: Read the lower 4 scrambling bits c 3 c 2 c 1 c 0 Corresponding to the 4 scrambling soft bits in the table Table 1 is shown in Table 1 according to the table generated by the above three proposed methods of descrambling soft bits;

[0041] Table 1

[0042] scrambling bits

scrambled soft bits

scrambling bits

scrambled soft bits

0000

0x00000000

1000

0xFF000000

0001

0x000000FF

1001

0xFF0000FF

0010

0x0000FF00

1010

0xFF00FF00

[0043] 0011

0x0000FFFF

1011

0xFF00FFFF

0100

0x00FF0000

1100

0xFFFF0000

0101

0x00FF00FF

1101

0xFFFF00FF

0110

0x00FFFF00

1110

0xFFFFFF00

0111

0x00FFFFFF

1...

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Abstract

The invention discloses a quick soft bit descrambling method used in communication. The quick soft bit descrambling method comprises the following operations carried out at a receiving end: reading a code-scrambling bit which is the same as a scrambling bit used by a sending end, wherein the code-scrambling bit is used as a descrambling bit; reading a code-scrambling soft bit, corresponding to the code-scrambling bit, in a table, wherein the table generating rule is that the soft bit corresponding to a descrambling code '0' is '0*00', and the soft bit corresponding to the descrambling code '1' is '0*FF'; and reading demodulated and output soft bit to be-descrambled, carrying out an exclusive-or operation onto to-be-descrambled soft bit and the corresponding code-scrambling soft bit of the read code-scrambling bit in the table, and storing the result. The quick soft bit descrambling method used in communication is simple to realize, quick and efficient and is a simple and feasible method which is capable of quickly descrambling the soft bit corresponding to mass descrambling data, so that real-time processing efficiency of a digital signal in a physical layer is quickened up.

Description

technical field [0001] The invention relates to the field of mobile communication LTE, in particular to a soft bit fast descrambling method used in communication. Background technique [0002] In the process of baseband signal transmission, if the data bit stream has continuous "1" and continuous "0", the baseband signal will contain a lot of low-frequency components, which is not suitable for the transmission characteristics of the channel; on the other hand, the clock will be used before decoding at the receiving end. The recovery circuit extracts the line clock. The extraction principle is realized by using the waveform jump between the transmission code stream "0" and "1", and the continuous "0" or continuous "1" brings the line clock to the extraction. difficult. In order to overcome the situation of "1" and "0", that is, to ensure that the distribution probability of "0" and "1" in the data stream entering the transmission channel can be basically equal under any circ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04W12/02H04L1/00
Inventor 陈住生杨繁高永升
Owner WUHAN POST & TELECOMM RES INST CO LTD
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