Exemple #1
0
// test unscrambling of soft bits (helper function to keep code base small)
void liquid_scramble_soft_test(unsigned int _n)
{
    unsigned char msg_org[_n];      // input data
    unsigned char msg_enc[_n];      // scrambled data 
    unsigned char msg_soft[8*_n];   // scrambled data (soft bits)
    unsigned char msg_dec[_n];      // unscrambled data

    unsigned int i;

    // initialize data array (random)
    for (i=0; i<_n; i++)
        msg_org[i] = rand() & 0xff;

    // scramble input
    memmove(msg_enc, msg_org, _n);
    scramble_data(msg_enc,_n);

    // convert to soft bits
    for (i=0; i<_n; i++)
        liquid_unpack_soft_bits(msg_enc[i], 8, &msg_soft[8*i]);

    // unscramble result
    unscramble_data_soft(msg_soft, _n);

    // unpack soft bits
    for (i=0; i<_n; i++) {
        unsigned int sym_out;
        liquid_pack_soft_bits(&msg_soft[8*i], 8, &sym_out);
        msg_dec[i] = sym_out;
    }

    // ensure data are equivalent
    CONTEND_SAME_DATA(msg_org, msg_dec, _n);
}
Exemple #2
0
// Help function to keep code base small
void modem_test_demodsoft(modulation_scheme _ms)
{
    // generate mod/demod
    modem mod   = modem_create(_ms);
    modem demod = modem_create(_ms);

    // 
    unsigned int bps = modem_get_bps(demod);

    // run the test
    unsigned int i, s, M=1<<bps;
    unsigned int sym_soft;
    unsigned char soft_bits[bps];
    float complex x;
    
    for (i=0; i<M; i++) {
        // modulate symbol
        modem_modulate(mod, i, &x);

        // demodulate using soft-decision
        modem_demodulate_soft(demod, x, &s, soft_bits);

        // check hard-decision output
        CONTEND_EQUALITY(s, i);

        // check soft bits
        liquid_pack_soft_bits(soft_bits, bps, &sym_soft);
        CONTEND_EQUALITY(sym_soft, i);

        // check phase error, evm, etc.
        //CONTEND_DELTA( modem_get_demodulator_phase_error(demod), 0.0f, 1e-3f);
        //CONTEND_DELTA( modem_get_demodulator_evm(demod), 0.0f, 1e-3f);
    }
    // clean it up
    modem_destroy(mod);
    modem_destroy(demod);
}