Optimized interleaving of digital signals

Abstract

A method is described for changing the order of bytes of digital signals transmitted in frames according to a cyclic rotation of the bytes and for changing the frame format. This method can advantageously be used in a concatenated coding scheme, e.g a serial concatenation of two Reed-Solomon codes, to achieve the best trade off between coding gain and line bit rate. The disclosed interleaving method is applicable to optical transport networks. <IMAGE>

Description

Technical field [0001] The invention relates to an interleaving technique used for digital signal coding in an optical transmission network, in particular to a two-level cascaded Reed-Solomon (Reed-Solomon) code and optimized interleaving technique. Background technique [0002] In order to reduce the bit error rate of a particular signal-to-noise ratio, or have the same bit error rate at a lower signal-to-noise ratio, a variety of coding schemes can be used to improve the performance of the transmission channel. This can be achieved at the transmitter by an encoder that adds some additional bits (called redundant bits) derived from the information bits to these information bits, which will lead to an increase in the line bit rate. At the receiver, the decoder detects these additional bits for correcting the erroneous bits. [0003] The two main coding schemes are: block codes and convolutional codes. The third type is called concatenated code, which is obtained by combining two ...

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Problems solved by technology

[0010] - A single encoding scheme is not adequate for some applications;

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