Method and apparatus for interleaving data in an asymmetric digi

Details Method and apparatus for interleaving data in an asymmetric digi Method and apparatus for interleaving data in an asymmetric digi

1996-09-30

1998-04-07

Baker, Stephen M.

Excavating

371 391, H03M 1322

Patent

active

057373370

ABSTRACT:
In an ADSL transmitter (62), data is flamed and split between a fast path and an interleave path by multiplexer (66). Data is forward error correction encoded in FEC encoder (70). Data on the interleave path is interleaved by interleaver (72) if an interleave depth (D) is >2. During interleaving, at least one additional read operation is performed, after a series of consecutive write and read operations. The additional read operation permits interleaving to continue without waiting for a next frame of data to arrive at the interleaver. An equal number of additional write operations compensates for the additional reads at a later point. Use of an interleaving memory can also be avoided by turning off or disabling the interleaver, while still permitting data to be sent along the interleave path. Transmit path controller (74) senses if D=1, and if so disables the interleaver and avoids the need for interleaver memory (64).

REFERENCES:
patent: 5495483 (1996-02-01), Grube et al.
patent: 5596604 (1997-01-01), Cioffi et al.
patent: 5636224 (1997-06-01), Voith et al.
Alliance for Telecommunications Industry Solutions, "Asymmetric Digital Subscriber Line (ADSL) Metallic Interface", Draft American National Standard for Telecommunications, Network and Customer Installation Interfaces, T1E1.4/94-007R7, pp. i-xii and pp. 2-171.
Tong, et al., "Revised FEC and Interleaving Recommendations for DMT ADSL", Amati Communications Corp., pp. 2-6; May 10, 1993.
Ramsey, John L., "Realization of Optimum Interleavers"; IEEE Transactions on Information Theory, vol. IT-16; pp. 338-345; May 1970.

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