CMMB receiver decoding method

A decoding method and receiver technology, applied in the field of CMMB receiver decoding, can solve the problems of high power consumption and shortened working time of the receiver, and achieve the effects of reducing power consumption, saving power consumption, and avoiding blind decoding

Active Publication Date: 2010-10-27
HANGZHOU NATCHIP SCI & TECH
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AI Technical Summary

Problems solved by technology

[0007] The decoding method of separating the inner code and outer code of the traditional CMMB receiver has brought about high power consumption. The application occasion of CMMB is a mobile environment, and the receiver is mainly powered by batteries, so that the working time of the receiver is greatly shortened due to battery consumption.

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Embodiment Construction

[0022] The technical scheme of the present invention is described below in conjunction with accompanying drawing

[0023] The following table shows the number of columns of interleaving blocks occupied by each LDPC codeword corresponding to different CMMB interleaving block sizes and different inner code rates:

[0024] Number of Byte Deinterleaving Rows

72

108

144

216

288

432

1 / 2 code rate per LDPC

Number of columns that the codeword occupies in the interleaving block

8

16 / 3

4

8 / 3

2

4 / 3

3 / 4 code rate per LDPC

Number of columns that the codeword occupies in the interleaving block

12

8

6

4

3

2

[0025] It can be seen that for a code rate of 3 / 4, each LDPC codeword occupies an integer number of interleaving columns, while for a code rate of 1 / 2, different numbers of interleaving rows may cause each LDPC codeword to occupy a frac...

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Abstract

The invention relates to a CMMB receiver decoding method, which is applicable to a mobile multimedia broadcasting system by utilizing CMMB standard to multiplexing the data. The traditional decoding method for separating internal code and external code of the CMMB receiver has high power consumption. By utilizing the method, the internal code is combined with the external code to be decoded, the combination of the internal and the external codes depends on the byte portioning deinterleave between the internal and the external codes so as to reduce the power consumption and to prolong the endurance time of the battery. If the remained error of the LDPC decoding can be ensured to be concentrated at the checkbit part and the information byte is correct, the method can directly send out the information byte without the RS decoding, so the power consumption can be reduced, and the work time of the CMMB receiver can be prolonged.

Description

technical field [0001] The invention belongs to the field of wireless communication and relates to a decoding method for a CMMB receiver. Background technique [0002] The China Mobile Multimedia Broadcasting (CMMB) transmission system adopts the technical system of cascading inner code and outer code. The inner code adopts low-density redundancy check code (LDPC code), and the outer code adopts Reed-Solomon code (RS code). . Byte block deinterleaving is used between the inner code and the outer code to break up channel errors and enhance the error correction capability of the receiver. The internal code and byte block deinterleaving used in CMMB occupy most of the resources in the entire receiver chip design, resulting in increased power consumption. The technical system of cascading internal code and external code can increase the error correction capability of the channel. At the same time, the complexity of the system is also increased, resulting in an increase in powe...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03M13/11H04N5/44H04N7/64H04N19/89
Inventor 邢新景张迎罗淑文
Owner HANGZHOU NATCHIP SCI & TECH
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