Parallel Resampling of OFDM Signals for Fluctuating Doppler Shifts in Underwater Acoustic Communication

Table 1

OFDM parameters.

Modulation	QPSK-OFDM
Sampling frequency (kHz)	200
Center frequency (kHz)	45
Frequency band (kHz)	30 to 60
FFT size	1024
FFT length (ms)	34.1
GI length (ms)	4.3
Number of data subcarriers	512
Number of pilot subcarriers	512
OFDM frame length (ms)	38.4
Frequency domain oversampling factor	1, 2
FEC (coding rate)	Convolutional coding (3/4)
Channel model	AWGN
CNR	30 dB