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SOVA Turbo decoder method, decoder and communication device thereof

A soft output Viterbi and turbo decoding technology, which is applied in the field of turbo decoders and can solve problems such as low complexity

Inactive Publication Date: 2004-06-09
SONY INT (EURO) GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this approach has very low complexity (no complicated calculations required), it is necessary to find the right number for all scenarios

Method used

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  • SOVA Turbo decoder method, decoder and communication device thereof
  • SOVA Turbo decoder method, decoder and communication device thereof
  • SOVA Turbo decoder method, decoder and communication device thereof

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Embodiment Construction

[0037] Detailed Description of Preferred Embodiments

[0038] A transmission system according to the present invention will now be explained in general with reference to FIG. 1, as shown in FIG. 1, in which various data can be transmitted wirelessly. The data to be sent may include voice data from the telephone 1, 23, digital video data from, for example, the camera 5 to be sent to the monitor 20, and other digital information data, for example, from the video camera 5 to be sent to another Data from computer 6 of computer 19. Analog voice data from the telephone 1 is A / D converted 2 and speech coded 3, and then supplied to a channel coder 4. Data from a video camera 5 or from a computer 6 is also supplied to the channel encoder 4, for example. Different data, for example, voice data and video data can be transmitted simultaneously. Data from the channel encoder 4 is applied to an interpolator 7 and then to a modulator 8 which provides a symbol map. The modulated data from...

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Abstract

To obtain best performance from a turbo decoder using a SOVA algorithm a normalisation unit (27) is used. By using normalisation the complexity of the decoder is increased. To decrease the complexity it is proposed not to normalise all of the decoding units (27, 33) output. In this way computational complexity is reduced for only a small degradation in performance.

Description

field of invention [0001] The present invention relates to a turbo decoder using a soft output Viterbi algorithm, a mobile communication device including such a turbo decoder and a turbo decoding method using a soft output Viterbi algorithm (SOVA). Background technique [0002] Turbo coding methods were first proposed by Berrou et al. in "Near Shannon Limit Error-Correcting Coding and Decoding: Turbo-Codes", Proc. IEEE Conference on Communications (ICC 93), pp. 1064-1070, 1993. The turbo coding method is of great interest due to the remarkable BER performance achievable. The turbo decoding method combines the concepts of iterative decoding, soft-in / soft-out decoding, recursive systematic convolution (RSC) coding and random interpolation. [0003] The turbo encoding method (and the corresponding decoding method) can be implemented in a parallel or serial cascade scheme. The present invention involves two approaches. For the parallel case, an encoder consists of two or more...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03M13/13H03M13/29H03M13/41H03M13/45H04B14/04
CPCH03M13/2957H03M13/4146H03M13/658H03M13/41
Inventor R·斯蒂尔林-加拉彻尔
Owner SONY INT (EURO) GMBH