Open AccessTransmitter IQ mismatch compensation in coherent optical OFDM systems using pilot signals
Author(s) -
Wonzoo Chung
Publication year - 2010
Publication title -
optics express
Language(s) - Uncategorized
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.18.021308
Subject(s) - orthogonal frequency division multiplexing , transmitter , distortion (music) , orthogonalization , computer science , channel (broadcasting) , compensation (psychology) , bit error rate , multiplexing , electronic engineering , optics , telecommunications , bandwidth (computing) , physics , algorithm , engineering , psychology , amplifier , psychoanalysis
Transmitter in-phase/quadrature (IQ) mismatch in coherent optical orthogonal frequency division multiplexing (CO-OFDM) systems is difficult to mitigate at the receiver using conventional time domain methods such as the Gram-Schmidt orthogonalization procedure, particularly in the presence of channel distortion. In this paper, we present a scheme that mitigates both transmitter IQ mismatch and channel distortion. We propose a pilot structure to estimate both channel and IQ mismatch, and develop a minimum mean square error compensation method. Numerical results show that the proposed method is effective in reducing transmitter IQ mismatch for a CO-OFDM system.