Decoder apparatus and decoding method

A decoding device and repeated decoding technology, applied in other decoding technologies, encoding, code conversion, etc., can solve the problem of huge storage capacity, etc., achieve the effect of shortening the training interval, improving characteristics, reducing the amount of calculation and storage capacity

Inactive Publication Date: 2006-12-20
PANASONIC CORP
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0021] In Turbo decoding, the information bit d is performed by performing an operation like this k decoding, but requires a huge storage capacity

Method used

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  • Decoder apparatus and decoding method
  • Decoder apparatus and decoding method
  • Decoder apparatus and decoding method

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Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0039] figure 2 is a block diagram showing the configuration of a turbo decoder according to Embodiment 1 of the present invention. In this figure, the element decoder 101 decodes the systematic bit sequence Y1, the parity bit sequence Y2, and a priori value (priori value) La1, and outputs the external value Le1 to the interleaver 102, wherein the priori value The value La1 refers to the reliability information transmitted from the deinterleaver 105 . The so-called extrinsic value refers to the increment of the symbol reliability according to the elemental decoder.

[0040] The interleaver 102 rearranges the external value Le1 output from the element decoder 101 and outputs it to the element decoder 104 as a priori value La2. In the first repetition, because the element decoder 104 has not yet decoded, "0" is substituted into the prior value.

[0041] The element decoder 104 inputs the rearranged sequence of the systematic bit sequence Y1 in the interleaver 103, the parity...

Embodiment approach 2

[0065] In Embodiment 2 of the present invention, a case where no training section is provided will be described. Wherein, since the structure of the Turbo decoder according to this embodiment is the same as figure 2 are the same, and the structure of the element decoder is the same as image 3 same, so citing figure 2 and image 3 , its detailed description is omitted.

[0066] Figure 6 It is a schematic pattern diagram which shows the repetitive processing of B operation|computation according to Embodiment 2 of this invention. Here, the window size is assumed to be 32, and three windows are used for description for convenience of description. In this figure, when the repetition count is 1, the window from time 0 to 31 is B#0, the window from time 32 to 63 is B#1, and the window from time 64 to 95 is B#2.

[0067] In the B operation with a repetition number of 1, the calculation is performed in the reverse direction of time for each window, the backward probability of...

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Abstract

A decoder apparatus capable of preventing its characteristic from degrading even when the decoding rate is high, while exhibiting reduced arithmetic amount and memory capacity. In the decoder apparatus, a migration probability calculating part (201) calculates a migration probability from a systematic bit (Y1), a parity bit (Y2) and a priori value (La1), and a forward probability calculating part (202) divides a data sequence into a plurality of windows and calculates a forward probability for each of the windows. A memory (204) has stored a backward probability of a predetermined time calculated in the previous repetitive decoding. A backward probability calculating part (203) divides the data sequence into a plurality of windows and calculates a backward probability for each of the windows by use of the backward probability stored in the memory (204) as an initial value in the current repetitive decoding. A likelihood calculating part (205) uses the calculated forward and backward probabilities to calculate likelihood information.

Description

technical field [0001] The present invention relates to a decoding device and a decoding method, and is especially suitable for such a decoding device and a decoding method as performing Turbo decoding. Background technique [0002] In recent years, VSF-OFCDM (Variable Spreading Factor-Orthogonal Frequency Division Code Division Multiplexing) has attracted much attention as the most likely candidate for the fourth generation mobile communication. When VSF-OFCDM (Variable Spreading Factor-Orthogonal Frequency Division Code Division Multiplexing) is used, the bandwidth of about 50-100MHz is used, and the highest transmission rate can reach more than 100Mbps. In such an ultra-high-speed communication method, it is suitable to use Turbo codec as an error correction method. [0003] The characteristic of the Turbo codec method is that it uses convolutional coding and interleaving for sending data, and performs repeated decoding during decoding. It is well known that by performi...

Claims

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Application Information

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Patent Type & AuthorityApplications(China)
IPC IPC(8): H03M13/29H03M13/41H03M13/45H04B1/707H04J11/00H04J13/00H04L1/00
CPCH03M13/3972H03M13/3905H03M13/00H04L1/00H03M13/29H03M13/41
Inventor李继峰
OwnerPANASONIC CORP