Receiver-Only Optimized Vector Quantization for Fading Channels
Source: University of South Florida
This paper considers the design and analysis of a filter at the receiver of a source coding system to mitigate the excess distortion caused due to channel errors. The index output by the source encoder is sent over a fading discrete binary symmetric channel and the possibly incorrect received index is mapped to the corresponding codeword by a Vector Quantization (VQ) decoder at the receiver. The output of the VQ decoder is then processed by a receive filter to obtain an estimate of the source instantiation. The distortion performance is analyzed for Weighted Mean Square Error (WMSE) and the optimum receive filter that minimizes the expected distortion is derived for two different cases of fading.