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Forward error correction system for packet based data and real time media, using cross-wise parity calculation

  • US 6,243,846 B1
  • Filed: 04/17/1998
  • Issued: 06/05/2001
  • Est. Priority Date: 12/12/1997
  • Status: Expired due to Term
First Claim
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1. A method of communicating payload through a packet switched telecommunications network, said network including a first node and a second node, said payload defining a sequence of windows of k payload blocks, said sequence including a current window of k payload blocks and a subsequent window of k payload blocks, said method comprising, in combination:

  • at said first node, generating p parity blocks by an encoding process comprised of functionally combining together the k payload blocks of the current window, wherein p≧

    1, and wherein at least one of said p parity blocks comprises a cross-wise parity block derived as a function of said k payload blocks of said current window taken along an index-shifted path through said k payload blocks of said current window;

    piggy-backing said p parity blocks onto a number of payload blocks in the subsequent window;

    transmitting into the network the k payload blocks of the current window; and

    transmitting into the network the k payload blocks of the subsequent window, whereby the k payload blocks of the subsequent window includes the p parity blocks.

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