Title:Channel Estimation Algorithms in Optical OFDM Transmission
VOLUME: 6 ISSUE: 1
Author(s):Chenxi Hao, Qiwei Chen, Lilong Liu, Xuelin Yang and Weisheng Hu
Affiliation:State Key Laboratory of Advanced Optical Communication Systems and Networks, Department of Electrical Engineering, Shanghai Jiao Tong University, Shanghai, China.
Keywords:Channel estimation, optical OFDM, pilot tones, phase noise
Abstract:Recent progress and patents on channel estimation algorithms in optical orthogonal frequency division multiplexing
(OFDM) systems are reviewed. The channel estimation algorithms can be divided into two categories of pilotaided
and blind approaches. For the pilot-aided schemes, the two pilot patterns including the comb-type pilots and blocktype
pilots are evaluated by experiments. For the blind schemes, the phase noise caused by the laser linewidth and chromatic
dispersion (CD) in the fiber channel can be effectively compensated by the proposed data-aided channel estimation
algorithms, which is experimentally demonstrated by the significant improvement in the performances of transmitted
OFDM signals.
