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- W2224224681 abstract "So far we have discussed source and channel coding problems separately. In this chapter we address the combination of the two, known as joint source-channel coding (JSCC). In a JSCC scheme, the encoder maps a source sequence into a channel input block, while the decoder produces a source estimate from the corresponding channel outputs. This mapping can be constructed using a concatenation of source and channel codes, in which case it is known as a separation-based scheme. While Shannon's separation principle states that this approach yields asymptotically the smallest possible average distortion, other schemes may have significant advantages as we will see in the following. For example, analog transmission (symbol-by-symbol mapping) has very desirable properties of low complexity and high robustness. However, except for some very special source-channel pairs, it is inferior to the digital (separation-based) approach in terms of average distortion. Therefore, finding schemes which are neither fully digital nor fully analog is of great interest. In this context, lattices play a natural role: since they are defined directly in the Euclidean space, they do not require mapping of the source sequence into a digital representation and back, as done in a separation-based scheme. We shall present a “semi-analog” JSCC technique, based on lattice codes, called “modulolattice modulation” (MLM)." @default.
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- W2224224681 date "2014-08-06" @default.
- W2224224681 modified "2023-09-26" @default.
- W2224224681 title "Modulo-lattice modulation" @default.
- W2224224681 doi "https://doi.org/10.1017/cbo9781139045520.012" @default.
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