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An algorithm to generate soft output or log-likelihood-ratios (LLR''s) on channel bits for channels which can be characterized by dominant error events (DEE) is proposed. The magnetic recording and optical recording systems fall under such class of channels [5]. For these channels, a concatenated coding scheme consisting of an outer Reed-Solomon (RS) and an inner parity code with single bit parity...
The features of long delay, great error rate and packet loss, asymmetric bandwidth between uplink and downlink and links easily interrupted in deep space communication determine the technology of encoding and decoding is a difficult issue. The basic conception and features of fountain codes are introduced, and the question of all-selected, degree distribution and the decoding algorithm of fountain...
Unequal error protection is the key to future transport of multimedia data. The paper presents an overview of some new approaches realizing UEP properties in physical transport, especially multicarrier modulation, or with LDPC and turbo codes. For multicarrier modulation, a UEP bit-loading method is described allowing for an arbitrary number of classes, arbitrary SNR margins between the classes and...
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