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By searching among the EXIT curves of all 86 classes of APP in decoders (86 classes of demappers [20] followed by a doping rate 1/60 RA decoder, as in Figure 1), it is found that among the 86 mappings, the EXIT curve of the APP in decoder of mapper 50 converges best with that of the VLC decoder APP out: A narrow open tunnel of EXIT curves can be observed at E b /N 0=2.4 dB.
The inner decoder APP in consists of a soft demapper and the concatenated rate-1 RSC decoder.
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Figure 3 Heuristic experiments for target setting.(a) EXIT curves of the corresponding outer/inner APP decoder and decoding trajectory for 30 iterations; (b) SER L vs. E b /N 0 curves for different iterations.
The second algorithm (A 2), which exploits the path metrics from the Viterbi decoder to approximate the APPs, represents our main contribution.
Whereas these referenced papers make use of the approximate APPs inside the iterative decoder, we focus on using the approximate APPs only in the iterative estimation algorithm and use the standard Viterbi algorithm (which does not need symbol APPs) for decoding.
The input a priori LLR to the decoder is subtracted from LLR app(b(n)) to obtain the extrinsic reliability information LL R ext ′ ( b ( n ) ).
The channel decoder then not only provides APPs of the information bits but also provides APPs of the encoded bits.
When customers entered a store and connected to Wi-Fi, a decoder was enabled inside the comic app to read an alien language.
The MAP decoder computes soft outputs, LL R app (b(n))—the a posteriori reliability information of each coded bit in LLR form by minimizing the bit error probability (BEP [24].
Several Marketplace media apps solve the lack of support by including a 3rd party software decoder, but I've found most of those apps to lack basic functionality and tend to randomly freeze the tablet.
At the receiver side, bit-level extrinsic information is exchanged between the inner a posteriori probability (APP) demapper/decoder and the outer VLC APP decoder.
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Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com