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Turbo code based heterogeneous error code protection method of signal

A non-uniform, signal technology used in telecommunications to improve accuracy

Inactive Publication Date: 2017-10-13
UNIV OF SHANGHAI FOR SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The present invention aims at the problem that signal transmission in a wireless channel is easily affected by noise and interference in the channel, and proposes a signal error protection method based on Turbo codes. By analyzing the importance of all information bits corresponding to the signal, the important The law of degree of security is applied to the Turbo code. By modifying the puncturing method in the coding structure of the Turbo code, the information bits of different importance levels can be protected in different degrees, thereby improving the accuracy of the information bits in the transmission process. rate, improve the quality of the output signal at the receiving end

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  • Turbo code based heterogeneous error code protection method of signal
  • Turbo code based heterogeneous error code protection method of signal
  • Turbo code based heterogeneous error code protection method of signal

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Embodiment

[0037] Such as figure 1 As shown, reading requires transmitting a signal and subjecting it to source encoding with specific encoding rules.

[0038] Step 1, each sampling point s in the signali According to a specific encoding rule g(*), it is encoded into a k-bit binary sequence, that is, s i =g(b i1 ,b i2 ,b i3 ,...,b ij ,...,b i,k-1 ,b ik ), 1≤j≤k.

[0039] Suppose the magnitude function of the signal is:

[0040] f(s i ) = f(s 1 ,s 2 ,s 3 ,...,s N-1 ,s N )

[0041] After the signal is encoded by the source, each sampling point s i (i=1,2,3,...,n) can be composed of k binary bits {b i1 ,b i2 ,b i3 ,...,b ij ,...,b i,k-1 ,b ik}express:

[0042] the s i =g(b i1 ,b i2 ,b i3 ,...,b ij ,...,b i,k-1 ,b ik ), 1≤j≤k

[0043] Therefore, the amplitude function of the signal can be represented by the binary bits corresponding to the sampling points: f(s i ) = f(g(b ij )),i=1,2,3,…,n,j=1,2,3,…,k

[0044] When the signal is transmitted in the channel, it...

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Abstract

The invention relates to a turbo code based heterogeneous error code protection method of a signal. The method comprises the following steps that sampling points si in the signal are coded according to a specific coding rule, an expression of the bit significance level is obtained via a signal variation and amplitude probability density function p(si), significance levels of all the bits are obtained by analyzing the quantity of influence of a single bit on the signal as well as the appearance probability of the single bit, the bit significance levels are applied to channel coding, high-grade protection is provided for bits of higher significance levels, namely, more verification bits are distributed, and low-grade protection is provided for bits of lower significance levels, namely, fewer verification bits are distributed. Compared with a present signal error code protection method, characteristics of the signal itself are utilized fully, different grades of the error code protection are provided for the bits of different significance levels, the signal transmission accuracy is improved under the same code rate, and the method of the invention can be applied to the field of wireless communication.

Description

technical field [0001] The invention belongs to the field of telecommunications, and in particular relates to a method for protecting signal non-uniform bit errors based on Turbo codes. Background technique [0002] Digital signals are easily affected by noise and interference during wireless channel transmission, which degrades the quality of the output signal at the receiving end. Error correction coding is used to reduce the bit error rate of information bits during transmission. Traditional error correction coding methods are limited to uniform error protection, that is, to give all information bits the same degree of protection. Turbo code is an excellent channel coding method, which can be used to effectively improve the transmission quality of signals. The coding structure of the Turbo code includes a puncturer, whose function is to regularly puncture the check bits, so as to realize the control of the data transmission code rate. However, the puncturing method in t...

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Application Information

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IPC IPC(8): H04L1/00
CPCH04L1/0059H04L1/0066H04L1/007
Inventor 秦川肖群孙佳忆孙美慧何志红张雅蕾
Owner UNIV OF SHANGHAI FOR SCI & TECH