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The resulting encoded binary codeword (mathbf {C}triangleq {C_{n}}_{n=1}^{N}in {0,1}^{N}) is interleaved by a random interleaver Π yielding the interleaved sequence X with X n =C Π(n).
The coded bits are then interleaved by a random interleaver as described in [6] to produce the interleaved codeword c ̃.
Its outputs are interleaved by a known interleaver and then binary phase shift keying (BPSK) modulated.
The resulting coded sequence c m ∈ F 2 L c of length L c is interleaved by a user specific interleaver Π m resulting in the interleaved code sequence c m ′ ∈ F 2 L c. Finally, the interleaved code bits are mapped onto symbols from the normalized alphabet A resulting in the transmit sequence x m ∈ A L x of length L x with σ x 2 = 1.
For non-adaptive relaying, all relay information words b m,n are encoded using the same channel code C as the sources and interleaved by the user specific interleavers Π m.
Each bit sequence is encoded with code rate R = N/K ′ (ENC), interleaved by a layer-specific interleaver (π m ) and mapped onto the complex plane via binary phase shift keying (BPSK), which leads to the layer-wise symbols x m ′.
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Shown is the specific part for detection of the information word b m of source S m. and are then jointly de-interleaved by the user specific interleaver and jointly decoded (bottom part).
The extrinsic information Λ c m ext is then re-interleaved by the user specific interleaver Π m followed by the corresponding relay specific interleavers Π r, n and fed back as a-priori information to the IC.
These APPs, known as extrinsic information, can be used after interleaving by the equalizer as prior probabilities, also known as intrinsic information, for the next iteration.
(1 Each of the three streams is interleaved separately by a sub-block interleaver.
Interleaved sequences are denoted by a dash a' and double interleaved sequences by two dashes a".
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Justyna Jupowicz-Kozak
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