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simplified branches with only frozen bits

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Ahmet Inan 2021-07-12 20:51:11 +02:00
commit d87ce6e81e
2 changed files with 139 additions and 32 deletions
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72
polar_decoder.hh
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@ -11,6 +11,18 @@ Copyright 2020 Ahmet Inan <inan@aicodix.de>
namespace CODE {
template <typename TYPE, int M>
struct PolarNode
{
typedef PolarHelper<TYPE> PH;
static const int N = 1 << M;
static void rate0(TYPE *hard)
{
for (int i = 0; i < N; ++i)
hard[i] = PH::one();
}
};
template <typename TYPE, int M>
struct PolarTree
{
@ -39,10 +51,16 @@ struct PolarTree<TYPE, 6>
{
for (int i = 0; i < N/2; ++i)
soft[i+N/2] = PH::prod(soft[i+N], soft[i+N/2+N]);
PolarTree<TYPE, M-1>::decode(message, hard, soft, frozen[0]);
if (frozen[0] == 0xffffffff)
PolarNode<TYPE, M-1>::rate0(hard);
else
PolarTree<TYPE, M-1>::decode(message, hard, soft, frozen[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]);
PolarTree<TYPE, M-1>::decode(message, hard+N/2, soft, frozen[1]);
if (frozen[1] == 0xffffffff)
PolarNode<TYPE, M-1>::rate0(hard+N/2);
else
PolarTree<TYPE, M-1>::decode(message, hard+N/2, soft, frozen[1]);
for (int i = 0; i < N/2; ++i)
hard[i] = PH::qmul(hard[i], hard[i+N/2]);
}
@ -58,10 +76,16 @@ struct PolarTree<TYPE, 5>
{
for (int i = 0; i < N/2; ++i)
soft[i+N/2] = PH::prod(soft[i+N], soft[i+N/2+N]);
PolarTree<TYPE, M-1>::decode(message, hard, soft, frozen & ((1<<(1<<(M-1)))-1));
if ((frozen & ((1<<(1<<(M-1)))-1)) == ((1<<(1<<(M-1)))-1))
PolarNode<TYPE, M-1>::rate0(hard);
else
PolarTree<TYPE, M-1>::decode(message, hard, soft, frozen & ((1<<(1<<(M-1)))-1));
for (int i = 0; i < N/2; ++i)
soft[i+N/2] = PH::madd(hard[i], soft[i+N], soft[i+N/2+N]);
PolarTree<TYPE, M-1>::decode(message, hard+N/2, soft, frozen >> (N/2));
if (frozen >> (N/2) == ((1<<(1<<(M-1)))-1))
PolarNode<TYPE, M-1>::rate0(hard+N/2);
else
PolarTree<TYPE, M-1>::decode(message, hard+N/2, soft, frozen >> (N/2));
for (int i = 0; i < N/2; ++i)
hard[i] = PH::qmul(hard[i], hard[i+N/2]);
}
@ -77,10 +101,16 @@ struct PolarTree<TYPE, 4>
{
for (int i = 0; i < N/2; ++i)
soft[i+N/2] = PH::prod(soft[i+N], soft[i+N/2+N]);
PolarTree<TYPE, M-1>::decode(message, hard, soft, frozen & ((1<<(1<<(M-1)))-1));
if ((frozen & ((1<<(1<<(M-1)))-1)) == ((1<<(1<<(M-1)))-1))
PolarNode<TYPE, M-1>::rate0(hard);
else
PolarTree<TYPE, M-1>::decode(message, hard, soft, frozen & ((1<<(1<<(M-1)))-1));
for (int i = 0; i < N/2; ++i)
soft[i+N/2] = PH::madd(hard[i], soft[i+N], soft[i+N/2+N]);
PolarTree<TYPE, M-1>::decode(message, hard+N/2, soft, frozen >> (N/2));
if (frozen >> (N/2) == ((1<<(1<<(M-1)))-1))
PolarNode<TYPE, M-1>::rate0(hard+N/2);
else
PolarTree<TYPE, M-1>::decode(message, hard+N/2, soft, frozen >> (N/2));
for (int i = 0; i < N/2; ++i)
hard[i] = PH::qmul(hard[i], hard[i+N/2]);
}
@ -96,10 +126,16 @@ struct PolarTree<TYPE, 3>
{
for (int i = 0; i < N/2; ++i)
soft[i+N/2] = PH::prod(soft[i+N], soft[i+N/2+N]);
PolarTree<TYPE, M-1>::decode(message, hard, soft, frozen & ((1<<(1<<(M-1)))-1));
if ((frozen & ((1<<(1<<(M-1)))-1)) == ((1<<(1<<(M-1)))-1))
PolarNode<TYPE, M-1>::rate0(hard);
else
PolarTree<TYPE, M-1>::decode(message, hard, soft, frozen & ((1<<(1<<(M-1)))-1));
for (int i = 0; i < N/2; ++i)
soft[i+N/2] = PH::madd(hard[i], soft[i+N], soft[i+N/2+N]);
PolarTree<TYPE, M-1>::decode(message, hard+N/2, soft, frozen >> (N/2));
if (frozen >> (N/2) == ((1<<(1<<(M-1)))-1))
PolarNode<TYPE, M-1>::rate0(hard+N/2);
else
PolarTree<TYPE, M-1>::decode(message, hard+N/2, soft, frozen >> (N/2));
for (int i = 0; i < N/2; ++i)
hard[i] = PH::qmul(hard[i], hard[i+N/2]);
}
@ -115,10 +151,16 @@ struct PolarTree<TYPE, 2>
{
for (int i = 0; i < N/2; ++i)
soft[i+N/2] = PH::prod(soft[i+N], soft[i+N/2+N]);
PolarTree<TYPE, M-1>::decode(message, hard, soft, frozen & ((1<<(1<<(M-1)))-1));
if ((frozen & ((1<<(1<<(M-1)))-1)) == ((1<<(1<<(M-1)))-1))
PolarNode<TYPE, M-1>::rate0(hard);
else
PolarTree<TYPE, M-1>::decode(message, hard, soft, frozen & ((1<<(1<<(M-1)))-1));
for (int i = 0; i < N/2; ++i)
soft[i+N/2] = PH::madd(hard[i], soft[i+N], soft[i+N/2+N]);
PolarTree<TYPE, M-1>::decode(message, hard+N/2, soft, frozen >> (N/2));
if (frozen >> (N/2) == ((1<<(1<<(M-1)))-1))
PolarNode<TYPE, M-1>::rate0(hard+N/2);
else
PolarTree<TYPE, M-1>::decode(message, hard+N/2, soft, frozen >> (N/2));
for (int i = 0; i < N/2; ++i)
hard[i] = PH::qmul(hard[i], hard[i+N/2]);
}
@ -131,9 +173,15 @@ struct PolarTree<TYPE, 1>
static void decode(TYPE **message, TYPE *hard, TYPE *soft, uint32_t frozen)
{
soft[1] = PH::prod(soft[2], soft[3]);
PolarTree<TYPE, 0>::decode(message, hard, soft, frozen & 1);
if (frozen & 1)
PolarNode<TYPE, 0>::rate0(hard);
else
PolarTree<TYPE, 0>::decode(message, hard, soft, 0);
soft[1] = PH::madd(hard[0], soft[2], soft[3]);
PolarTree<TYPE, 0>::decode(message, hard+1, soft, frozen >> 1);
if (frozen >> 1)
PolarNode<TYPE, 0>::rate0(hard+1);
else
PolarTree<TYPE, 0>::decode(message, hard+1, soft, 0);
hard[0] = PH::qmul(hard[0], hard[1]);
}
};