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with rep() nodes the leafs become unneccessary

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This commit is contained in:
Ahmet Inan 2021-07-17 15:49:00 +02:00
commit 22fcdfcba0
1 changed files with 2 additions and 37 deletions
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39
polar_decoder.hh
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@ -51,21 +51,6 @@ struct PolarNode
}
};
template <typename TYPE>
struct PolarNode<TYPE, 0>
{
typedef PolarHelper<TYPE> PH;
static void rate0(TYPE *hard)
{
*hard = PH::one();
}
static void rate1(TYPE **message, TYPE *hard, TYPE *soft)
{
*hard = PH::signum(soft[1]);
*(*message)++ = *hard;
}
};
template <typename TYPE, int M>
struct PolarTree
{
@ -233,7 +218,7 @@ struct PolarTree<TYPE, 2>
else if ((frozen & ((1<<(1<<(M-1)))-1)) == 0)
PolarNode<TYPE, M-1>::rate1(message, hard, soft);
else
PolarTree<TYPE, M-1>::decode(message, hard, soft, frozen & ((1<<(1<<(M-1)))-1));
assert(0);
for (int i = 0; i < N/2; ++i)
soft[i+N/2] = PH::madd(hard[i], soft[i+N], soft[i+N/2+N]);
if (frozen >> (N/2) == ((1<<(1<<(M-1)))-1))
@ -243,32 +228,12 @@ struct PolarTree<TYPE, 2>
else if (frozen >> (N/2) == 0)
PolarNode<TYPE, M-1>::rate1(message, hard+N/2, soft);
else
PolarTree<TYPE, M-1>::decode(message, hard+N/2, soft, frozen >> (N/2));
assert(0);
for (int i = 0; i < N/2; ++i)
hard[i] = PH::qmul(hard[i], hard[i+N/2]);
}
};
template <typename TYPE>
struct PolarTree<TYPE, 1>
{
typedef PolarHelper<TYPE> PH;
static void decode(TYPE **message, TYPE *hard, TYPE *soft, uint32_t frozen)
{
soft[1] = PH::prod(soft[2], soft[3]);
if (frozen & 1)
PolarNode<TYPE, 0>::rate0(hard);
else
PolarNode<TYPE, 0>::rate1(message, hard, soft);
soft[1] = PH::madd(hard[0], soft[2], soft[3]);
if (frozen >> 1)
PolarNode<TYPE, 0>::rate0(hard+1);
else
PolarNode<TYPE, 0>::rate1(message, hard+1, soft);
hard[0] = PH::qmul(hard[0], hard[1]);
}
};
template <typename TYPE, int MAX_M>
class PolarDecoder
{