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An extension of the Smith construction for self orthogonal array codes is presented. The information bit array, originally two dimensional, now becomes multidimensional. Array codes obtained with this construction are not self orthogonal. Decoding is rather more complex, but the codes are more efficient (have higher rates) than those of the Smith construction.<<ETX>>
Coherent optical communication systems that employ semiconductor lasers have exhibited degraded performance caused by laser phase noise. A rate 1/2, constraint length of seven, convolutional code with hard decision, Viterbi decoding has been applied to an experimental 220 Mbit/s optical FSK channel. Code testing has demonstrated the ability to improve system efficiency and significantly reduce the...
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