Soft decoding for vector quantization in combination with block channel coding
Mikael Skoglund, P. Hedelin · 2002
According to the two-step source/channel coding procedure introduced by Shannon, the source and the channel codes are designed and used separately. Recent research has striven to find efficient combined approaches for source/channel coding. Much of this research has considered vector quantization (VQ) for noisy channels. We present a method for joint decoding of the combination of a vector quantizer and a channel code. Our decoder is soft in the sense that no decisions are involved in the decoding, and the unquantized channel outputs are utilized. We depart from the traditional way of decoding, in that we make the decoding into a one-step procedure, without any intermediate channel decoding. We also demonstrate that estimates of the transmitted binary data can be efficiently obtained in our framework.