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Method for storing path metric in sustaining ratio decoder

A Viterbi decoder and path metric technology, which is applied in the field of storing path metrics in Viterbi decoders, can solve problems such as inability to rewrite, and achieve the effects of low power consumption and small area requirements

Inactive Publication Date: 2004-09-01
INFINEON TECH AG
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Problems solved by technology

[0019] However, the resulting problem is that the path metrics cannot be rewritten before they are read
[0023] Another problem associated with path metric storage is the placement of path metrics on the memory

Method used

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  • Method for storing path metric in sustaining ratio decoder
  • Method for storing path metric in sustaining ratio decoder
  • Method for storing path metric in sustaining ratio decoder

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Embodiment Construction

[0038] Before comparing the details of the present invention in detail, several technical terms should be briefly introduced below, because these technical terms will also be used when describing the various contents of the present invention later.

[0039] Assume a system with a total storage capacity of M t A trellis encoder that stores words can be obtained with a N TS = 2 Mt grid code, where N TS is the number of various states plotted in the corresponding trellis diagram. For a forward coding with a coding rate of 1 / 2, the length of the impulse response word is M T +1. Each state transition in the trellis diagram depends on some coded binary digits B as introduced earlier, and the state at time point t+1 is S t+1 is generated from the previous state St according to the following relation:

[0040] S (t+1) =(2·S t ) mod (N TS )+B

[0041] If the raster map has Figure 6 The typical butterfly structure shown in (introduced earlier), then each butterfly will have ...

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Abstract

The present invention relates to a method for storage line beat in Vittbe code translator. For a Viterbi decoder, it is proposed to combine the butterfly structures of the corresponding trellis diagram in pairs in such a way that for each butterfly structure pair, the destination states of the two butterfly structures in the trellis diagram at the same time form starting states for two other butterfly structures. After the determination of the path metrics of the destination states of the two butterfly structures of a butterfly structure pair, in each case the path metrics of those two destination states of this butterfly structure pair which are the same time form starting states of another butterfly structure are then stored in the form of a common memory word.

Description

technical field [0001] The invention relates to a new method for storing path metrics in a Viterbi decoder which is particularly suitable for decoding channel-coded mobile radio signals by Viterbi decoding in mobile radio receivers. Background technique [0002] Viterbi decoders are used in most well-known digital mobile radio receivers. A Viterbi decoder is a so-called "Maximum-Liklihood Decoder" (Maximum-Liklihood Decoder), which is generally used for decoding channel-coded, in particular convolutionally coded (faltungscodiert) mobile radio signals. In the case of channel coding, the transmitter often needs to add redundant information to the transmitted symbols to improve the security of transmission. However, this additional redundant information adds noise to the transmission of the mobile radio signal. Therefore, the receiver should have the function of selecting, by virtue of the received sequence, from all possible transmission sequences, that which corresponds to ...

Claims

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Application Information

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IPC IPC(8): H03M13/41
CPCH03M13/4107H03M13/41
Inventor 马里奥·特雷贝尔
Owner INFINEON TECH AG
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