Method and system for high-spread high-distance interleaving for turbo-codes
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United States of America Patent
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Apr 27, 2004
Grant Date -
Jan 17, 2002
app pub date -
May 25, 2001
filing date -
May 26, 2000
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Abstract
A system and method are provided for designing high-spread, high-distance interleavers for turbo-codes. The first approach is called high-spread random interleaving, and is based on a new and more effective definition of interleaver spread. The second approach is called dithered-diagonal interleaving. Both methods can be used to design interleaves of arbitrary length. The second approach can actually achieve the theoretical maximum spread for many specific block sizes, and at the same time include significant dither for the elimination of low-weight codewords. Both design methods are easy to implement and require very little processing. Also provided is a method for modifying any interleaver to improve the distance spectrum for a specific turbo-code. It is shown that, for a block size of only 512 data bits and for a code rate of 1/3, the flares in the packet error rate (PER) and bit error rate (BER) curves can be kept below 10.sup.-8 and 10.sup.-10, respectively.
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