A Brief Introduction to Polar Codes
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چکیده
Figure 1: Factor Graph In particular, consider a setup where (U1, U2) are two equiprobable bits that are encoded into (X1, X2) = (U1 ⊕ U2, U2). Then, (X1, X2) are mapped to (Y1, Y2) by two independent BMS channels with transition probabilities P(Y1 = y |X1 = x) = P(Y2 = y |X2 = x) = W (y|x). The factor graph for this setup is shown in Figure 1. Since the mapping from (U1, U2) to (X1, X2) is invertible, one finds that
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تاریخ انتشار 2015