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    • 2. 发明授权
    • Forward error correction for high speed optical transmission systems
    • 高速光传输系统的前向纠错
    • US06683855B1
    • 2004-01-27
    • US09143781
    • 1998-08-31
    • Mark Aldo BordognaRalf DohmenWolfram Sturm
    • Mark Aldo BordognaRalf DohmenWolfram Sturm
    • H04J116
    • H04L1/0057H04J3/14H04J3/1611H04J2203/0089H04L1/0043H04L1/0083
    • Memory requirements and processing delays associated with the application of forward error correction in high speed optical transmissions are substantially reduced by mapping a forward error correction code on a row-by-row basis into unused overhead bytes in a high bit rate signal frame. By applying the forward error correction code to an entire row of the signal frame on a row by row basis, approximately one row needs to be stored at a time thereby reducing the total memory requirements for forward error correction processing. Using SONET as an exemplary application, approximately {fraction (1/9)}th of the entire SONET frame (e.g., one of nine rows) needs to be buffered for forward error correction processing. In an illustrative embodiment, four forward error correction (FEC) blocks are provided for each row for a total of 36 FEC blocks for a frame. Each FEC block comprises four bytes of correction bits for a total of 32 correction bits. These 32 correction bits are mapped to unused overhead and are used for correcting errors in one block of one row of a signal frame, wherein one block covers ¼th of the row. Other unused overhead bytes in the row can be used to carry error detection codes for detecting multiple errors in a row to determine when forward error correction should be disabled. For example, if a single bit error correcting code is employed, then error correction can be disabled to avoid false corrections if more than one error is detected.
    • 通过将高速率光传输中的前向纠错码逐行地映射到高比特率信号帧中的未使用的开销字节,大大减少了与高速光传输中的前向纠错应用相关联的存储器要求和处理延迟。 通过逐行地将前向纠错码应用于信号帧的整个行,需要一次存储大约一行,从而减少前向纠错处理的总存储器要求。 使用SONET作为示例性应用,大约{部分(整个SONET帧的1/9(例如,九行中的一个)需要被缓冲用于前向纠错处理)在说明性实施例中,四个前向纠错(FEC)块 为每帧提供总共36个FEC块,每个FEC块包含四个字节的校正位,总共32个校正位,这32个校正位映射到未使用的开销,用于校正一个错误 一行信号帧的块,其中一个块覆盖该行的第十四行,该行中的其他未使用的开销字节可用于携带用于检测一行中的多个错误的错误检测码,以确定何时应禁用前向纠错。 例如,如果采用单个位错误校正码,则如果检测到多于一个错误,则可以禁用错误校正以避免错误校正。