leansdr::s2_plscodes< T > Struct Template Reference

#include <dvbs2.h>

Public Member Functions
	s2_plscodes ()

Public Attributes
uint64_t	codewords [COUNT]
complex< T >	symbols [COUNT][LENGTH]

Static Public Attributes
static const int	COUNT = 128
static const int	LENGTH = 64
static const uint64_t	SCRAMBLING = 0x719d83c953422dfa

Detailed Description

template<typename T>
struct leansdr::s2_plscodes< T >

Definition at line 76 of file dvbs2.h.

Constructor & Destructor Documentation

s2_plscodes()

template<typename T>

leansdr::s2_plscodes< T >::s2_plscodes ( )

inline

Definition at line 83 of file dvbs2.h.

References leansdr::cstln_amp, i, leansdr::complex< T >::im, leansdr::s2_sof< T >::LENGTH, and leansdr::complex< T >::re.

    {
        uint32_t G[6] = {0x55555555,
                         0x33333333,
                         0x0f0f0f0f,
                         0x00ff00ff,
                         0x0000ffff,
                         0xffffffff};
        for (int index = 0; index < COUNT; ++index)
        {
            uint32_t y = 0;
            for (int row = 0; row < 6; ++row)
                if ((index >> (6 - row)) & 1)
                    y ^= G[row];
            uint64_t code = 0;
            for (int bit = 31; bit >= 0; --bit)
            {
                int yi = (y >> bit) & 1;
                if (index & 1)
                    code = (code << 2) | (yi << 1) | (yi ^ 1);
                else
                    code = (code << 2) | (yi << 1) | yi;
            }
            // Scrambling
            code ^= SCRAMBLING;
            // Store precomputed codeword.
            codewords[index] = code;
            // Also store as symbols.
            for (int i = 0; i < LENGTH; ++i)
            {
                int yi = (code >> (LENGTH - 1 - i)) & 1;
                int nyi = yi ^ (i & 1);
                symbols[index][i].re = cstln_amp * (1 - 2 * nyi) / sqrtf(2);
                symbols[index][i].im = cstln_amp * (1 - 2 * yi) / sqrtf(2);
            }
        }
    }

Member Data Documentation

codewords

template<typename T>

uint64_t leansdr::s2_plscodes< T >::codewords[COUNT]

Definition at line 81 of file dvbs2.h.

COUNT

template<typename T>

const int leansdr::s2_plscodes< T >::COUNT = 128

static

Definition at line 79 of file dvbs2.h.

LENGTH

template<typename T>

const int leansdr::s2_plscodes< T >::LENGTH = 64

static

Definition at line 80 of file dvbs2.h.

SCRAMBLING

template<typename T>

const uint64_t leansdr::s2_plscodes< T >::SCRAMBLING = 0x719d83c953422dfa

static

Definition at line 120 of file dvbs2.h.

symbols

template<typename T>

complex<T> leansdr::s2_plscodes< T >::symbols[COUNT][LENGTH]

Definition at line 82 of file dvbs2.h.

---

The documentation for this struct was generated from the following file:

• plugins/channelrx/demoddatv/leansdr/dvbs2.h