Abstract

DFT-Spread (DFT-S) OFDM is a variant of OFDM with multiple advantages, however, one disadvantage is its degraded phase noise tolerance, due to sampling rate slow-down in each DFT-S subband. Here, we propose a phase recovery method for 16-QAM coherent transmission, based on the combination of nonredundant (de)interleaving, differential precoding, and multisymbol delay detection (MSDD), applicable to either conventional DFT-S OFDM receivers or to filter-bank subbanded DFT-S OFDM receivers. Laser and nonlinear phase noise tolerances are significantly improved, as simulated for a filter-bank-based subbanded DFT-S OFDM receiver for 16-QAM over 1000 km SMF.

© 2014 IEEE

An analytical study of the improved nonlinear tolerance of DFT-spread OFDM and its unitary-spread OFDM generalization

Gal Shulkind and Moshe Nazarathy
Opt. Express 20(23) 25884-25901 (2012)

Experimental demonstration of improved fiber nonlinearity tolerance for unique-word DFT-spread OFDM systems

Xi Chen, An Li, Guanjun Gao, and William Shieh
Opt. Express 19(27) 26198-26207 (2011)

Improvement of the chromatic dispersion tolerance in coherent optical OFDM systems using shifted DFT windows for ultra-long-haul optical transmission systems

Minkyu Sung, Hoon Kim, Jaehoon Lee, and Jichai Jeong
Opt. Express 22(19) 23539-23551 (2014)

Demostration of 520 Gb/s/λ pre-equalized DFT-spread PDM-16QAM-OFDM signal transmission

Fan Li, Jianjun Yu, Zizheng Cao, Ming Chen, Junwen Zhang, and Xinying Li
Opt. Express 24(3) 2648-2654 (2016)

DFT/IDFT-free receiving scheme for spread-OFDM signals employing low-sampling-rate ADCs

Chi-Hsiang Lin, Chun-Ting Lin, Chia-Chien Wei, and Sien Chi
Opt. Express 25(22) 27750-27757 (2017)