Joint source-channel coding method based on wavelet frame transform

A wavelet frame and channel coding technology, applied in image communication, digital video signal modification, television, etc., can solve the problem of channel error sensitivity

Inactive Publication Date: 2010-07-21
BEIHANG UNIV
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Problems solved by technology

The disadvantage of the wavelet SPIHT algorithm is that it is sensitive to channel errors, and it can be further protected by channel co...

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  • Joint source-channel coding method based on wavelet frame transform
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  • Joint source-channel coding method based on wavelet frame transform

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Embodiment Construction

[0068] See figure 1 , figure 2 , image 3 Shown, take 16 * 16 image matrix as example below, carry out the wavelet frame transformation of n=2 to it, channel coding considers adopting three kinds of different code rates (Rate1

[0069] sender:

[0070] Step 1: The original 16×16 image matrix is ​​decomposed by the wavelet frame decomposer, and the low frequency (LL 2 ), level (LH 2 , LH 1 ), vertical (HL 2 , HL 1 ), diagonally (HH 2 , HH 1 ) has a total of 7 coefficient matrices.

[0071] Step 2: These 7 coefficients are divided into low-frequency LL by matrix coefficient divider n matrix, and respectively by LH 2 and LH 1 , HL 2 and HL 1 , HH 2 and HH 1 Composed of three subtree matrices....

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Abstract

The invention discloses a joint source-channel coding method based on wavelet frame transform. A transmitting end comprises the following steps: 1. after processed by a wavelet frame decomposer, an original image is converted into sub-images with different frequencies; 2. predictive coding is carried out on a low-frequency coefficient matrix, and respectively independent SPIHT compression coding is carried out to three subtree matrixes; 3. a controller classifies compressed code flow according to importance; 4. a channel encoder carries out unequal error protection to different source code flows with different importance levels, and coding output is sent to a wireless channel by parallel/serial conversion and a modulator. A receiving end comprises the following steps: 1. a receipt signal enters a corresponding channel decoder by the parallel/serial conversion and the modulator to finish the channel coding with different code rates; 2. the controller outputs and reconstructs codings to form four parts of code flows which correspond to the low-frequency coefficient matrix and the three subtree matrixes; 3. the four parts of the code flows are respectively decompressed, and a coefficient matrix after initial transform is calculated out; 4. a wavelet frame reconstructing device regains the original image by the coefficient matrix.

Description

(1) Technical field: [0001] The present invention relates to a joint source channel coding method in a wireless communication system, in particular to a joint source channel coding method based on wavelet frame transform related to the transmission of multimedia data such as images or videos. Realizing efficient and reliable transmission of high-speed data in a wireless channel belongs to the technical field of wireless communication. (2) Technical background: [0002] With the rapid growth of multimedia information (image, audio and video, etc.) and the rapid development of communication technology, the future broadband wireless communication system needs to support high-quality transmission of multimedia services with higher data rates. Under the condition of limited bandwidth, the existing system widely adopts high-fidelity data compression technology with large compression ratio to achieve high-efficiency compression coding of multimedia sources, so as to make full use o...

Claims

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Application Information

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IPC IPC(8): H04N7/26H04N7/50H04N19/124H04N19/48H04N19/63H04N19/67
Inventor 修春娣朱华亮刘建伟
Owner BEIHANG UNIV
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