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Method of adaptive turbo decode

A decoding and data technology, applied in the field of digital mobile communication, can solve the problems of turbo code practical application difficulties, large processing data length, and large time delay, so as to reduce the number of iterations, reduce system delay, The effect of reducing the number of iterations

Inactive Publication Date: 2007-02-14
ZTE CORP
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Problems solved by technology

However, the practical application of turbo codes is still somewhat difficult, and one of the most important aspects is the decoding process. In data services, the length of processed data is generally relatively large, often more than one thousand or even several thousand bits.
In this case, if relying on the traditional logarithmic maximum a posteriori probability (MAX-LOG-MAP) algorithm for turbo decoding, coupled with multiple iterations, the amount of time delay is very large

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Embodiment Construction

[0017] The preferred embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0018] The adaptive turbo decoding method of the present invention has increased n-1 error factor controllers compared with the traditional parallel block decoding processor method, and simultaneously controls the iterative decoding results of n blocks in parallel, so that it can dynamically control the number of iterations of each piece of data, especially when the moving speed of the mobile station in the system is quite high, the multipath propagation environment changes rapidly, and the fading changes drastically, there will be a certain difference between each piece of the sequence to be decoded, thus The performance required by the system is achieved with the least number of iterations.

[0019] Such as figure 2 Shown, the method for adaptive turbo decoding of the present invention comprises the following steps:

[0020] a. Divid...

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Abstract

This invention relates to an adaptive turbo decoding method including the following steps: dividing received data into multiple blocks according to a code restrict length and the actual length of input data, identifying each divided sequence so as to merge and output in terms of the original sequence of the data to be input into multiple parallel decode processors to be decoded simultaneously then to be sent to the corresponding error factor controller after one time of coding to compute their error factors, continuing the iteration till the performance of which can meet the needs of the system or reach the top limit of the largest designed iteration times, outputting the sequence after decoding same to that before decoding in blocks, which reduces iteration times of part data blocks and system time delay.

Description

technical field [0001] The present invention relates to the field of digital mobile communication, in particular to a decoding method of a turbo code in a communication system, in particular to a method using adaptive turbo decoding, which performs parallel block decoding on a turbo code, through multiple The error factor controller is used to control the number of iterations of each block in the block decoding. On the premise of not affecting the system performance, the number of decoding iterations in some data blocks can be reduced to a certain extent, thereby reducing the decoding delay. Background technique [0002] The turbo code of the prior art is widely paid attention to because of its excellent performance, and includes WCDMA, CDMA2000 and TD-SCDMA etc. in the relevant proposal of mobile communication system, except adopting and IS-95CDMA system similar convolution code technology and interleaving In addition to technology, it is also recommended to use turbo codin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03M13/29H03M13/00
Inventor 李颖刘虎肖炼斌
Owner ZTE CORP
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