Rev. 2 | |
Forward Error Correction | CD/CIM550.IOM |
FEC Mode (64 kbps data rate) | |
Viterbi, Rate 1/2 | 12 |
|
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Sequential, Rate 1/2 | 74 |
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Turbo Product Coding, Rate 3/4, QPSK | 79 |
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Turbo Product Coding, Rate 21/44, | 64 |
BPSK |
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Turbo Product Coding, Rate 5/16, | 48 |
BPSK |
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Note: In all cases, the delay is inversely proportional to data rate, so for 128 kbps, the delay values would be half of those shown above.
It can be clearly seen that the concatenated
FOR | AGAINST |
Exceptionally good BER performance - significant | Nothing! |
improvement compared with every other FEC |
|
method in use today |
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No pronounced threshold effect - fails gracefully |
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Exceptional bandwidth efficiency for Rate 3/4 QPSK |
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- 40% less than Viterbi and concatenated Reed- |
|
Solomon |
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Coding gain independent of data rate (in this |
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implementation) |
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Low decoding delay |
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|
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Easy field upgrade in |
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95