Source fidelity over fading channels: erasure codes versus scalable codes

K.E. Zachariadis, M.E. Honig, A.K. Katsaggelos
2005 GLOBECOM '05. IEEE Global Telecommunications Conference, 2005.  
We consider the transmission of a Gaussian source through a block fading channel. Assuming each block is decoded independently, the received distortion depends on the tradeoff between quantization accuracy and probability of outage. Namely, higher quantization accuracy requires a higher channel code rate, which increases the probability of outage. Here we evaluate the received mean distortion with erasure coding across blocks as a function of the code length. We also evaluate the performance of
more » ... scalable, or multi-resolution coding in which coded layers are superimposed, and the layers are sequentially decoded. In addition to analyzing a finite number of layers, we evaluate the mean distortion at high Signal-to-Noise Ratios as the number of layers becomes infinite. As the block length of the erasure code increases to infinity, the received distortion converges to a deterministic limit, which is less than the mean distortion with an infinite-layer scalable coding scheme. However, for the same standard deviation in received distortion, infinite layer scalable coding performs slightly better than erasure coding.
doi:10.1109/glocom.2005.1578223 dblp:conf/globecom/ZachariadisHK05 fatcat:brtjtvy4gndsvhasjehvoacso4