Improved Training Sequence Channel Estimation Scheme in 16QAM MB-OFDM UWBoF System

Table 1

The main parameters of the transceiver based on a single training sequence scheme.

Parameter name	Parameter value
Single OFDM symbol duration	312.5 ns
FFT/IFFT size/number of subcarriers	128
CP and ZPS	37 (=16 + 21)
Data/pilot/null subcarrier/guard interval	100/12/6/10
Bandwidth (relative to one of the sub-bands)	528 MHz
Number of TS/OFDM symbols	3/312
DAC and ADC sampling rate	10.561GSps and 20GSps
Modulation format	16QAM
The total number of bits per OFDM symbol	16QAM: 100 ∗ 4 = 400 bits
Original signal bit rate	16QAM: log2 (16) ∗ (1/312.5) ∗ 100 = 1.28 Gbps
Signal net bit rate	400 ∗ 312/ (315 ∗ 165 ∗ 20/10.561) = 1.268 Gbps
Optical spectrum efficiency	1.268/ (100/128 ∗ 0.528) = 3.074 bit/s/Hz