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As mentioned the parity bits are not sent all at once, but they are iteratively requested by the decoder, through a feedback channel, until the estimated error probability on the decoded bit plane reaches a predefined threshold.
In video communication systems, the video signals are typically compressed and sent to the decoder through an error-prone transmission channel that may corrupt the compressed signal, causing the degradation of the final decoded video quality.
A feedback from the outer decoder is attached to the inner decoder through an interleaver.
Also another high complexity algorithm, mode decision, needs transfer from the encoder to the decoder through four different flexible modes.
The inner decoder receives demodulated data and passes its soft output to the outer decoder through the de-interleaver.
The outer decoder's soft output is fed back to the inner decoder through an interleaver, and the inner decoder uses this feedback for the next decoding iteration.
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The hard information from turbo decoder goes through CRC module.
In other words, the performance degradation caused by the uncertainty of the initial state abates rapidly as the decoder traverses through the trellis.
We observe that even though the BER tends to decrease in general as the Viterbi decoder traverses through the trellis, the BER is not a monotonically decreasing function of index k.
We emphasize here that all of the adaptation of the decoder was through NAcc evaluative feedback and there was no a priori training or any external training signal.
His codes used iterative decoding, meaning that the decoder would pass through the data several times, making increasingly refined guesses about the identity of each bit.
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