QPSK BER for AWGN channel
In this experiment the bit error rate (BER) vs
of QPSK over an AWGN channel is analyzed.
Quadrature phase-shift keying (QPSK) transmission
The simulation starts with a setting of
(see marked line in the table below). This yields to this bit error probability:
|Measured BER approximates the analytical bit error probability
Bit error probability
|Analytical bit error probability
. Measure the corresponding BER and compare it to the analytical bit error probability.
Simulation ? Settings (F11)
Measured BER approximates the analytical bit error probability:
- Vary the pulse shape. Note that the pulse shape has no effect on the BER but the transmit spectrum.
Simulation - Setup (F12)
- Switch to equivalent baseband. Note that the modem doesn’t affect the BER performance but the shifts the transmit spectrum to the base band.
- Switch to modem none. Note that the modem doesn’t affect the BER performance. There’s only one sample per symbol and no pulse shaping, so the simulation is much faster.