| 摘要 |
The present invention relates to an encoding apparatus and method for encoding a user data stream (m) into a channel data stream (y) as well as to a corresponding decoding apparatus and method. To improve the worst case BER behavior of storage systems and increase reliability, in particular which ensure a low BER without a large loss of information rate, particularly in two-dimensional optical storage systems or in communication systems, an encoding apparatus is proposed according to the invention which comprises: an expansion unit for transforming said user data stream (m) to an intermediate data stream (i) comprising at least one more symbol than said user data stream (m), a processing unit (100, 200, 500, 600) for iteratively determining for each scrambling stream (c) from a scrambling code (C) the value (v) of a figure of merit for the scrambling stream (c) using said intermediate data stream (i), a selection unit (300) for selecting an optimum merit value (v_opt) from said merit values (v) and for selecting an optimum scrambling stream (C opt) for which the figure of merit equals said optimum merit value (v_opt), and at least one mapping unit (400) for mapping the symbols of said optimum scrambling stream (C opt)(C:latin capital letter C with cedilla) onto the corresponding symbols of said intermediate data stream (i) to obtain said channel data stream (y) for output to a channel. ® KIPO & WIPO 2007
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