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Signal source and channel combined optimized adaptive error control method

A technology of channel coding and source coding, which is applied in the field of adaptive error control and error control of joint optimization of source and channel coding, and can solve the problems of time-varying fading of wireless channels, interference deterioration of high-dimensional modulation system performance, and turbo code failure, etc. question

Inactive Publication Date: 2009-07-08
BEIHANG UNIV
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Problems solved by technology

[0004] On the other hand, in order to achieve high-speed data transmission, high-dimensional modulation methods are applied to 3G / B3G systems, but the resulting problems are that the reliability of the system is challenged, the time-varying characteristics of wireless channels and complex Fading, interference, etc. will seriously deteriorate the performance of high-dimensional modulation systems, and even Turbo codes with a code rate of 1 / 3 will fail

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[0047] See figure 1 , figure 2 As shown, the TDM communication system is taken as an example below, the source coding considers the wavelet SPIHT algorithm, the channel coding considers the RCPT code, and the specific implementation steps of the present invention are described for the image service. The present invention is an adaptive error control method for joint optimization of information source and channel coding. The specific steps of the method are as follows:

[0048] Step 1: The original image is passed through the wavelet SPIHT image encoder, and the output code stream of the source is divided into three parts: important, secondary and non-important according to the importance. figure 2 As shown, take the k of length k respectively I 、k S and k N Form 3k long information packet A, and send it to the CRC encoder.

[0049] Step 2: After the information packet A obtained in step 1 is encoded by CRC, it is obtained figure 2 3K long data packet B; then send B to...

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Abstract

The invention discloses an adaptive error control method for source channel coding combined optimization, which is characterized in that the source coding output code streams are classified to the following three grades according to the significance: significance, secondary significance and non-significance; and during the channel coding process, the source code streams of the three graders undergo the adaptive unequal error protection by means of variable-velocity forward error control / hybrid automatic repeat request (FEC / HARQ), so as to allow the transmission rate and the channel coding rate of the source code streams to be adjusted adaptively according to the time-varying fading characteristics of the wireless channel, thereby optimizing the transmission quality of the source code streams and improving the transmission efficiency and the channel utilization rate of the whole system. The method comprises the six steps, overcomes the problems of contradiction and resource waste caused by the independent coding of the source and the channel in the prior communication system, achieves the effect of adaptive combined optimization of the source code stream transmission rate and the channel coding rate based on the time-varying fading characteristics of channel, and has good application prospects.

Description

(1) Technical field: [0001] The present invention relates to an error control method in a mobile communication system, in particular to an adaptive error control method based on joint optimization of source and channel coding, which is suitable for realizing image or The invention relates to efficient and reliable video transmission, which belongs to the technical field of mobile communication. (2) Technical background: [0002] With the support of the third-generation mobile communication (3G) system to multimedia (including voice, image and data, etc.) services, people continue to put forward new requirements for the transmission rate and communication quality of this service. This is also one of the hot issues in the research of the post-3G (B3G) technology (such as LTE and Wimax) and the fourth generation (4G) mobile communication system. In the wireless channel, in order to realize the transmission of multimedia services (images, videos), two major problems need to be ...

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Application Information

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IPC IPC(8): H04L1/00H04W28/04
Inventor 修春娣丁聪常青
Owner BEIHANG UNIV
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