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This paper presents a proposed enhancement to the current SARSAT distress message that is backward-compatible with the existing local user terminals (LUT) (i.e., ground stations) receivers. Additional coding is appended to the current message to allow for better performance for the new LUTs, soft-decision decoding is used in the evaluation of the current and enhanced format. Performance results on...
The error rate performance of turbo codes tends to flare at high SNRs due to poor distance properties. It is shown that the flare performance can be significantly improved by using an outer error detection code and a low-complexity event flipping cleanup approach. Using a rate 1/2, single-binary, 4-state turbo code with a 2048-bit data block, the packet error rate at 1.8 dB is lowered from 10-4 to...
This letter presents a method that significantly improves the error rate performance of turbo codes, especially in the error flare region, without changing the basic encoder structure. This method applies repeated decoding, with one or more symbols being forced to certain values, when an error is detected. This forces the decoder to output alternate sets of decisions that can then be checked for errors...
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