Abstract
Two radios on one frequency, each a complete receiver delivering whole blocks (and partial blocks as they arrive) tagged with its branch number. When both copies of a period are present and differ, both are FEC-decoded and both are tag-checked, every time, independently of each other’s result. One whole copy plays, chosen by fixed rules: a copy that decodes beats one that does not; then a copy whose tag passes beats one whose tag fails; then the lower score, d(c,A)+d(c,B) in the BCH modes or the number of failed parity groups in the detect-only modes; ties go to the preferred branch. No bit is ever moved from one copy into the other. The data-independent part of the period’s tag (the one-time MAC key, or the encrypted header block) is computed once and reused for both copies. Shortcuts that give the same decision at lower cost: identical copies are one copy; a copy whose codewords equal the other’s takes the other’s correction; corrected copies that agree on every tagged bit share the tag verdict; scores are counted only where the corrected copies differ. Playback holds a fixed time from a block’s arrival to its take by the output, equal to the single-radio setpoint plus a fixed 0.1 ms margin, so diversity never moves the timing. Only the preferred radio’s partial blocks are streamed into the decoder ahead of the whole block.
Creative Commons License
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Recommended Citation
Anonymous, "Two-receiver bodypack that decodes and tag-checks both copies of every differing block and plays one whole copy, at a fixed playback time", Technical Disclosure Commons, ()
https://www.tdcommons.org/dpubs_series/12133