Visual communication via trellis coding and transmission energy allocation

An unequal error protection approach for the reliable communication of visu al information over additive white Gaussian noise channels is proposed and studied. This method relies on a bandwidth-efficient coded modulation schem e that employs selective channel coding and transmission energy allocation in conjunction with sequence maximum a posteriori soft-decision detection. Experimental results indicate that this scheme exhibits graceful performanc e degradation as the channel conditions deteriorate and provides substantia l objective and subjective improvements over uncoded and equal-error protec tion systems. Coding gains of up to 4 dB in E-b/N-o are achieved.