Abstract
A directly modulated and coherently injection-locked WRC-FPLD transmitter is
preliminarily employed to perform the 16-QAM-OFDM data transmission by using an OFDM
subcarrier amplitude pre-leveling technique. The maxiμm transmission bit-rate of
20-Gbit/s is reported by fusing the OFDM subcarrier pre-leveling with the coherent
injection-locking techniques in such a directly modulated WRC-FPLD. Without pre-leveling
the OFDM subcarrier, the coherently injection-locked L-band WRC-FPLD suppresses its
mode-partition noise to improve the EVM of the 16-QAM-OFDM data only from 13.52% to
10.2%. The OFDM subcarrier pre-leveling effectively compensate the finite bandwidth and
unflattened modulating response of the injection-locked WRC-FPLD to improve the
transmission EVM and SNR performances. The received constellation plot reveals that the
EVM and SNR of the back-to-back transmitted 16-QAM-OFDM data are significantly improved
to 5.58% and 17 dB, respectively. With the use of both injection-locking and
pre-leveling techniques, the directly 16-QAM-OFDM modulated WRC-FPLD transmitter can
reach the FEC limited BER of 3.8 × 10-3 at a receiving power sensitivity of
-10 dBm. The OFDM subcarrier pre-leveling technique helps the WRC-FPLD to reduce the
overall BER of 16-QAM-OFDM data by one order of magnitude, providing a miniμm BER of
4.5 × 10-5 at a receiving power of -2 dBm.
© 2013 IEEE
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