shows the
electrical spectrum of the 16 QAM OFDM signal. The 16 QAM OFDM signal is then down-converted
to baseband and captured by a real-time scope with a 20 GS/s sampling rate and a 3 dB bandwidth
of 4 GHz. The transmission performance of the 16 QAM OFDM signal is analyzed using an off-line
Matlab digital signal processing program.