Unequal Error Protection: An Information-Theoretic Perspective
Borade, S.
Nakiboglu, B.
Lizhong Zheng
Dept. of Electr. Eng. & Comput. Sci., Massachusetts Inst. of Technol., Cambridge, MA, USA;
This paper appears in: Information Theory, IEEE Transactions on
Publication Date: Dec. 2009
Volume: 55,
Issue: 12
On page(s): 5511-5539
ISSN: 0018-9448
INSPEC Accession Number: 10979003
Digital Object Identifier: 10.1109/TIT.2009.2032819
Current Version Published: 2009-11-17
Abstract
An information-theoretic framework for unequal error protection is developed in terms of the exponential error bounds. The fundamental difference between the bit-wise and message-wise unequal error protection ( UEP) is demonstrated, for fixed-length block codes on discrete memoryless channels (DMCs) without feedback. Effect of feedback is investigated via variable-length block codes. It is shown that, feedback results in a significant improvement in both bit-wise and message-wise UEPs (except the single message case for missed detection). The distinction between false-alarm and missed-detection formalizations for message-wise UEP is also considered. All results presented are at rates close to capacity.
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