IEEE Trans Image Process - Concatenated block codes for unequal error protection of embedded bit streams.

Tópicos

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Resumo

A state-of-the-art progressive source encoder is combined with a concatenated block coding mechanism to produce a robust source transmission system for embedded bit streams. The proposed scheme efficiently trades off the available total bit budget between information bits and parity bits through efficient information block size adjustment, concatenated block coding, and random block interleavers. The objective is to create embedded codewords such that, for a particular information block, the necessary protection is obtained via multiple channel encodings, contrary to the conventional methods that use a single code rate per information block. This way, a more flexible protection scheme is obtained. The information block size and concatenated coding rates are judiciously chosen to maximize system performance, subject to a total bit budget. The set of codes is usually created by puncturing a low-rate mother code so that a single encoder-decoder pair is used. The proposed scheme is shown to effectively enlarge this code set by providing more protection levels than is possible using the code rate set directly. At the expense of complexity, average system performance is shown to be significantly better than that of several known comparison systems, particularly at higher channel bit error rates.

Resumo Limpo

stateoftheart progress sourc encod combin concaten block code mechan produc robust sourc transmiss system embed bit stream propos scheme effici trade avail total bit budget inform bit pariti bit effici inform block size adjust concaten block code random block interleav object creat embed codeword particular inform block necessari protect obtain via multipl channel encod contrari convent method use singl code rate per inform block way flexibl protect scheme obtain inform block size concaten code rate judici chosen maxim system perform subject total bit budget set code usual creat punctur lowrat mother code singl encoderdecod pair use propos scheme shown effect enlarg code set provid protect level possibl use code rate set direct expens complex averag system perform shown signific better sever known comparison system particular higher channel bit error rate

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