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    • 8. 发明授权
    • Low delay channel codes for correcting bursts of lost packets
    • 用于校正丢包的突发的低延迟信道码
    • US06694478B1
    • 2004-02-17
    • US09707686
    • 2000-11-07
    • Emin MartinianCarl-Erik W. Sundberg
    • Emin MartinianCarl-Erik W. Sundberg
    • H03M1303
    • H04L1/0057H03M13/2721H03M13/373H03M13/3761H03M13/6502H04L1/0059H04L1/0061H04L1/008H04L65/607H04L65/80
    • A method and apparatus for coding and decoding a sequence of data packets with use of a novel class of forward error correcting codes having coding rates greater than 1/2 which nonetheless provide relatively high levels of channel protection against burst erasures with a relatively low decoding delay. In accordance with certain illustrative encoder embodiments of the present invention, the source information contained in each of a plurality of packets to be coded is similarly divided into a plurality of (similar) corresponding portions, and “checksums” are computed over multiple data packets, each such checksum being based on different (i.e., non-corresponding) portions of at least two of the multiple packets. These “checksums” are then advantageously appended to various subsequent data packets to be coded. By using different portions of multiple packets from which the checksums are computed, forward error correcting codes having rates greater than 1/2 which provide high levels of channel protection against burst erasures with relatively low decoding delays are advantageously provided. In accordance with illustrative decoder embodiments of the present invention, erased data packets may be regenerated based on the decoding of one or more subsequent (correctly received) data packets which include such appended “checksum” data.
    • 一种用于使用具有大于1/2的编码率的新颖的前向纠错码对数据分组序列进行编码和解码的方法和装置,尽管如此,它们以相对低的解码延迟提供相对较高级别的信道保护以防突发擦除 。 根据本发明的某些说明性编码器实施例,包含在要被编码的多个分组中的每一个的源信息被类似地分成多个(相似的)对应部分,并且通过多个数据分组来计算“校验和” 每个这样的校验和基于多个分组中的至少两个的不同(即非对应)部分。 这些“校验和”随后被有利地附加到要被编码的各种随后的数据分组。 通过使用计算校验和的多个分组的不同部分,有利地提供了具有大于1/2的速率的前向纠错码,其提供具有相对低的解码延迟的高级信道保护以防突发擦除。 根据本发明的说明性解码器实施例,可以基于包括这种附加的“校验和”数据的一个或多个后续(正确接收的)数据分组的解码来再生擦除的数据分组。