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Channel condition based self-adapting data staging protection method

A technology of channel status and data classification, applied in the direction of digital transmission system, error prevention, electrical components, etc., can solve problems such as poor adaptation, limited number of ARQ retransmissions, and entire packet loss

Inactive Publication Date: 2011-09-14
WUHAN UNIV
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  • Abstract
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  • Application Information

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Problems solved by technology

However, in the actual wireless network environment, neither of these two preconditions can be met: (1) due to the delay requirement of real-time wireless communication, the number of ARQ retransmissions must be limited; (2) due to the An error in the information block will cause the loss of the entire package, and the influence of the error will spread to the entire package containing the information block
Therefore, this data protection method cannot well adapt to the actual situation of multimedia real-time communication on wireless time-varying channels.

Method used

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  • Channel condition based self-adapting data staging protection method
  • Channel condition based self-adapting data staging protection method
  • Channel condition based self-adapting data staging protection method

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Embodiment

[0014] 1. According to the bit error rate and the code length of the error correction code in a certain channel state, calculate the probability α of the error correction code verification success in a certain channel state according to the following formula (1),

[0015] α ≈ X i = 0 n · p C n i · p i · ( 1 - p ) n - i - - - ( 1 )

[0016] In the above formula (1): p is the bit error rate under a certain channel state, and n is the code length of the error correction code.

[0017] 2. Calculate the optimal error correction code information length k under a certain channel state according to the following formula:

[0018] k ≈ n · ( 1 - 2 p ) 2 - α · α · [ 1 - ( 1 - α ) m ] { [ 1 - ( 1 - α ) m ] + α · ( X - 1 ) · m · ( 1 - α ) m - 1 } - - - ( 2 ...

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Abstract

The invention discloses a self-adaptive data ranking protection method based on channel state that is: calculating the probability of error correcting code checking success in some channel state based on coding length of error code, error correcting code; calculating the optimized error correcting code information length of some channel state based on the maximum sending times, number of information block composed in a package; repeating said two steps, calculating the error correcting code information length k in other channel state based on the error code of other channel state; selecting the error correcting code information length which is proximal with current channel state based on the obtained error correcting code information length k in different channel states to protect the error correction coding protection. The invention fits for situation that the ARQ retransmitting times is limited, and the error code of some package can lead to loss of entire package is also considered, so it can adapted to the real situation of multimedia real-time traffic in radio time-varying channel.

Description

Technical field [0001] The invention relates to the field of multimedia communication, in particular to an adaptive data hierarchical protection method based on channel state. Background technique [0002] Multimedia real-time communication on wireless time-varying channels must solve the problems of large video data volume, delay jitter, transmission bandwidth fluctuation, burst error and packet loss, multipath fading and multiple access reception. The usual solution is to select an appropriate error correction code to protect the transmitted multimedia data according to the channel state. In the adaptive data protection method based on VRHARQ (VariableRedundancy Hybrid Automatic Repeat reQuest, redundant variable hybrid automatic repeat request), based on the slow fading characteristics of the time-varying channel, the time-varying channel is equivalent to a finite state Markov (Markov). Fu) process, each Markov state corresponds to a different signal-to-noise ratio of the cha...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L1/00H04B7/00
Inventor 胡瑞敏韩镇朱立曾书婧
Owner WUHAN UNIV
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