Convolutional interleaving/DE-interleaving method and apparatus

Details Convolutional interleaving/DE-interleaving method and apparatus Convolutional interleaving/DE-interleaving method and apparatus

1997-01-07

1998-04-28

Asta, Frank J.

Excavating

371 21, 395481, 304DIG1, G06F 1100

Patent

active

057454973

ABSTRACT:
In a method and apparatus for selective convolutional interleaving or de-interleaving of symbols or data bits, a plurality of segments are defined in random access memory, with each segment including a different number of locations for storing symbols. Previously stored symbols are sequentially read out of current locations in the segments respectively, and new symbols are read into the current locations. Next locations in the segments are redesignated as current locations respectively, and the operation is repeated until all of the symbols have been interleaved or de-interleaved. The first location in each segment is designated by a respective segment pointer. The current and next locations are designated as relative offset pointers from the segment pointers, and these locations are incremented by incrementing the offset pointers. Interleaving or de-interleaving operation is determined by the direction in which the segments are sequentially selected for the read/write operations.

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patent: 4707805 (1987-11-01), Narusawa et al.
patent: 4710923 (1987-12-01), Nagumo
patent: 5353024 (1994-10-01), Graybill
Ramsey, John L., "Realization of Optimum Interleavers," IEEE Transactions on Information Theory, May, 1970, pp. 333-345.
Forney, Jr., David G., "Burst-Correcting Codes for the Classic Bursty Channel," IEEE Transactions on Communications Technology, Oct., 1971, pp. 772-780.

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