Title :
Block-Diagonal MIMO Equalization for Polarization-Multiplexed OFDM Transmission With Direct Detection
Author :
Cvijetic, Neda ; Prasad, Narayan ; Qian, Dayou ; Wang, Ting
Author_Institution :
NEC Labs. America, Princeton, NJ, USA
fDate :
6/15/2011 12:00:00 AM
Abstract :
We propose a novel digital signal processing (DSP)-based multiple-input-multiple-output (MIMO) equalization algorithm set for polarization-multiplexed orthogonal frequency-division multiplexing transmission with direct detection (POLMUX-OFDM-DD), based on block-diagonal matrix processing. The new methodology significantly reduces legacy zero forcing (ZF)-based equalization complexity, and enables performance gains via efficient minimum mean square error (MMSE) and maximum likelihood (ML) detection. The new block-diagonal MMSE and ML algorithms are experimentally shown to extend transmission distance from 870 to 900 km and beyond 960 km, respectively, in 20-Gb/s standard single-mode fiber (SSMF) POLMUX OFDM quadrature-phase-shift-keying (QPSK)-DD transmission. The new algorithms are highly attractive for future cost-efficient, DSP-based optical metro/access systems.
Keywords :
MIMO communication; OFDM modulation; equalisers; least mean squares methods; maximum likelihood detection; optical communication; DSP-based optical metro/access systems; ML algorithms; POLMUX-OFDM-DD; bit rate 20 Gbit/s; block-diagonal MIMO equalization; block-diagonal MMSE algorithms; block-diagonal matrix processing; digital signal processing-based multiple-input-multiple-output equalization algorithm; direct detection; distance 870 km; distance 900 km; legacy zero forcing-based equalization complexity; maximum likelihood detection; minimum mean square error; polarization-multiplexed OFDM transmission; polarization-multiplexed orthogonal frequency-division multiplexing transmission; quadrature-phase-shift-keying transmission; standard single-mode fiber; transmission distance; MIMO; OFDM; Optical fibers; Optical filters; Optical polarization; Optical receivers; Digital signal processing (DSP); multiple-input–multiple-output (MIMO); orthogonal frequency-division multiplexing (OFDM); polarization multiplexing;
Journal_Title :
Photonics Technology Letters, IEEE
DOI :
10.1109/LPT.2011.2131642
