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Intra-row permutation for turbocode

A technology of logic device and data frame, applied in the field of interleaver

Inactive Publication Date: 2005-02-09
APPLE INC
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

An ever-present problem with non-uniform coding is how to achieve interleaving while achieving enough "non-uniformity" in practice, and minimizing delay compensation which limits applications with real-time requirements

Method used

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  • Intra-row permutation for turbocode
  • Intra-row permutation for turbocode
  • Intra-row permutation for turbocode

Examples

Experimental program
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Effect test

example 1

[0057] Choose one such set for each prime number (column number). To cover the range of frame sizes from 320 bits to 8192 bits, at least 75 mother interleavers are provided. The column sizes and associated primitive roots for each interleaver are listed in Table 1, and 76 mother interleavers are listed in Table 1. primes so that the lowest N c (l-1) Provide a value.

[0058] A B C A B C A B C A B C

[0059] 13 2 21 97 5 21 193 5 21 307 5 21

[0060] 17 3 21 101 2 21 197 2 21 311 17 4

[0061] 19 2 21 103 5 21 199 3 21 313 10 21

[0062] 23 5 21 107 2 9 211 2 21 317 2 15

[0063] 29 2 21 109 6 21 223 3 5 331 3 21

[0064] 31 3 21 113 3 21 227 2 21 337 10 21

[0065] 37 2 21 127 3 21 229 6 1 347 2 21

[0066] 41 6 21 131 2 21 233 3 3 349 2 3

[0067] 43 3 21 137 3 21 239 7 21 353 3 21

[0068] 47 5 2 139 2 2 241 7 21 359 7 21

[0069] 53 2 21 149 2 5 251 6 21 367 6 11

[0070] 59 2 3 151 6 21 257 3 21 373 2 4

[0071] 61 2 21 157 5 21 263 5 21 379 2 21

[0072] 6...

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Abstract

An interleaver in which a frame of data to be interleaved is stored in at least a portion of an array having R rows and C columns, the portion having Nr<(1)> rows and Nc<(1)> columns that satisfy the inequality Nr<(1)> x Nc<(1-1)> < L < Nr<(1)> x Nc<(1)> where Nc<(1)> is a prime number and Nc<(1-1)> is the highest prime number less than Nc<(1)>. The elements of each row are permuted according to a predetermined mathematical relationship, and the rows are permuted according to predetermined mapping.

Description

field of invention [0001] The present invention relates generally to communication systems, and more particularly to interleavers for performing code modulation. Background of the invention [0002] Techniques for encoding communication channels, namely code modulation techniques, have been discovered to improve the bit error rate (BER) of electronic communication systems such as modems and wireless communication systems. or attenuation characterized by a "random error channel" has proven to be a practical, power-efficient, bandwidth-efficient modulation method, such a random error channel can be found, for example, in a Code Division Multiple Access (CDMA) environment, due to the capacity of the CDMA environment Depending on the signal-to-noise ratio of the operation, improved performance can translate into higher capacity. [0003] One aspect that makes a spiral encoder very efficient is the interleaver, which permutes the original received or transmitted data frame befor...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03M13/27G06F11/00H03MH03M13/00H03M13/03H03M13/29H04L1/00
CPCH03M13/2771H03M13/6558H03M13/2714H03M13/2735H03M13/2789H03M13/27
Inventor 李斌童文
Owner APPLE INC
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