16-QAM16-State Quadrature Amplitude Modulation
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8(a) shows the BER performance of these two codes with 16-QAM and ML demodulation under AWGN channel.
The first rate uses QPSK with rate 3/4 coding, while at 24 Mbps, 16-QAM with rate 1/2 coding is used.
Modulation Uncoded block Code block Overall size (bytes) size (bytes) coding rate BPSK 12 24 1/2 QPSK 24 48 1/2 QPSK 36 48 3/4 16-QAM 48 96 1/2 16-QAM 72 96 3/4 64-QAM 96 144 2/3 64-QAM 108 144 3/4 Modulation RS code CC code rate BPSK (12,12,0) 1/2 QPSK (32,24,4) 2/3 QPSK (40,36,2) 5/6 16-QAM (64,48,8) 2/3 16-QAM (80,72,4) 5/6 64-QAM (108,96,6) 3/4 64-QAM (120,108,6) 5/6 Fuente: Tomado de (Committee, 2004).
The ERS calculates the PER of the measured signal using the four principal modulation schemes used in recent satellite communication technologies, namely, QPSK, 8-PSK, 16-QAM, and 32-QAM.
All data carriers in one OFDM frame are modulated using QPSK, 16-QAM, 64-QAM, non-uniform 16-QAM or non-uniform 64-QAM constellations.
Pirminiai parametrai: RSCP--priimto signalo kodo galia; Ec/No--lusto gautos energijos santykis su galios tankiu visoje dazniu juostoje; SIR--signalo/ interferencijos santykis, nusako signalo galios santyki su triuksmo galia kanale; CQI--kanalo kokybes rodiklis; moduliacijos 16-QAM, QPSK.
In the signal generator, a data stream with a pseudorandom bit sequence (PRBS) length of 215 - 1 is mapped onto 72 16-QAM subcarriers, which are converted into the time domain together with 8 pilot subcarriers, one unfilled DC subcarrier, and 47 unfilled edge subcarriers by applying 128-point inverse fast Fourier transform (IFFT) [16].
In case of 4-PSK, 8-PSK and 16-QAM signal transmission over the additive white Gaussian noise (AWGN) channel the quality criterion for the best convolutional codes is the Euclidean distance [9].
In Figure 2, the waveform changes from 64-QAM to 16-QAM.
Estos datos son codificados con un codificador convolucional de tasa de 1/2, que provee para la capa OFDM tasas de transmision de 6, 12 y 24 Mbit/s, empleando modulaciones BPSK (Binary Phase Shift Keying), QPSK (Quaternary Phase Shift Keying) y 16-QAM (16 Quadrature Amplitude Modulation) respectivamente para cada velocidad.
These bits are now mapped into a number of data symbols using modulation scheme QPSK and 16-QAM.