Title :
Using LCDF-TEQ to Reduce CP Length for 20.48-Gb/s Direct Detection Optical OFDM Systems Over 1200 km of SMF
Author :
Ghanbarisabagh, M.
Author_Institution :
Dept. of Electr. Eng., Univ. of Malaya, Kuala Lumpur, Malaysia
Abstract :
In order to reduce the cyclic prefix (CP) length in direct-detection optical orthogonal frequency-division multiplexing (O-OFDM) over 1200 km of single-mode fiber (SMF), a low complexity decision feedback time-domain equalizer (LCDF-TEQ) is proposed. As a result, the residual inter symbol interference (ISI) and inter carrier interference (ICI) caused by both the group velocity dispersion (GVD) and the CP length being shorter than the channel impulse response (CIR) will be cancelled. The recursive calculation of channel matrix inverse reduces the computational complexity. Simulation results show that the performance of LCDF-TEQ is close to decision feedback time-domain equalizer (DF-TEQ) with a much lower complexity.
Keywords :
OFDM modulation; decision feedback equalisers; intercarrier interference; matrix algebra; optical fibre communication; optical modulation; CIR; CP Length; GVD; ICI; ISI; LCDF-TEQ; O-OFDM; SMF; bit rate 20.48 Gbit/s; channel impulse response; channel matrix inverse; cyclic prefix; decision feedback time-domain equalizer; direct detection optical OFDM system; group velocity dispersion; intercarrier interference; low complexity decision feedback; orthogonal frequency-division multiplexing; residual intersymbol interference; single-mode fiber; Complexity theory; Integrated optics; OFDM; Optical feedback; Optical fibers; Optical receivers; Dispersion; equalizer; group velocity; optical orthogonal frequency division multiplexing (OFDM);
Journal_Title :
Quantum Electronics, IEEE Journal of
DOI :
10.1109/JQE.2012.2232644
