Paper #506

Títol:

A zero-delay sequential scheme for lossy coding of individual sequences

Autors:

Tamás Linder i Gábor Lugosi

Data:

Febrer 2000

Resum:

We consider adaptive sequential lossy coding of bounded individual sequences when the performance is measured by the sequentially accumulated mean squared distortion. The encoder and the decoder are connected via a noiseless channel of capacity $R$ and both are assumed to have zero delay. No probabilistic assumptions are made on how the sequence to be encoded is generated. For any bounded sequence of length $n$, the distortion redundancy is defined as the normalized cumulative distortion of the sequential scheme minus the normalized cumulative distortion of the best scalar quantizer of rate $R$ which is matched to this particular sequence. We demonstrate the existence of a zero-delay sequential scheme which uses common randomization in the encoder and the decoder such that the normalized maximum distortion redundancy converges to zero at a rate $n^{-1/5}\log n$ as the length of the encoded sequence $n$ increases without bound.

Paraules clau:

Lossy source coding, scalar quantization, sequential prediction, individual sequences

Codis JEL:

C13, C14

Àrea de Recerca:

Estadística, Econometria i Mètodes Quantitatius

Publicat a:

IEEE Transactions on Information Theory, 47:2533--2538, 2001

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