Matched filter in digital communications
In this scenario, a pulse is sent and shall be detected at the receiver. It might represent a symbol for digital transmission or a radar pulse. The received pulse might be ...
A direct path and a reflected path set up a simple multipath propagation environment. Determine the channel impulse response and transfer function!
QAM BER for AWGN channel
Analyse the bit error rate of M-QAM over an AWGN channel. Adjust Eb/N0 and the constellation size. Compare the measured BER to the analytical bit error probability.
QPSK BER - equivalent baseband
Measure the bit error rate for QPSK in high accuracy. Use this experiment to hands-on verify the analytical bit error probability as a function of Eb/N0. This app is optimized for high simulation speed.
OFDM transmission step-by-step
Understand OFDM and process each step using example values. A pilot sequence initializes the equalizer. Transmit an OFDM symbol and detect ISI-free.
Guard interval and ISI-free OFDM transmission
Explore how OFDM implements an ISI-free transmission and verify the required guard interval length for a multipath channel. Modify the delay spread of a fading channel and check the received signal points for ISI.
OFDM BER vs Eb/N0 in AWGN channel
Verify the theoretical BER of IEEE 802.11ac OFDM setups with simulation results! Why does OFDM show an increased BER compared to single carrier systems in AWGN channel?
Peak-to-average power ratio of OFDM systems
Why do OFDM systems show a high peak-to-average power ratio? How does the PAPR depend on the number of subcarriers? Has the underlying M-QAM constellation size any impact?
Fast Fourier transform (FFT) - power invariant
The power of the FFT output signal differs from the input signal power due to an asymmetry in the FFT / IFFT definitions. This FFT variant keeps input and output signal powers equal.
Inverse fast Fourier transform (IFFT) - power invariant
The power of the IFFT output signal differs from the input signal power due to an asymmetry in the FFT / IFFT definitions. This IFFT variant keeps input and output signal powers equal.
See also: | Digital baseband transmission | QAM | QAM equalized | Two-ray multipath propagation | Fast fading demonstration - Extended Pedestrian A model | Doppler shift in wireless communications - 2 paths | Doppler spread - 10 paths | Jakes' spectrum | Timevariant multipath propagation | FFT calculator (power invariant) | IFFT calculator (power invariant) | OFDM BER for AWGN |