Title :
Wide-range frequency offset estimation method for a DD-OFDM-PON downstream system
Author :
Chen, Longquan ; Qiao, Yaojun ; Zhao, Yuan ; Ji, Yuefeng
Author_Institution :
State Key Lab. of Inf. Photonics & Opt. Commun., Beijing Univ. of Posts & Telecommun. (BUPT), Beijing, China
fDate :
7/1/2012 12:00:00 AM
Abstract :
We propose a wide-range frequency offset estimation algorithm used in a direct detection orthogonal frequency division multiplexing passive optical network (DD-OFDM-PON) downstream system. Using this method, frequency offset is estimated according to the spectrum of the received DD-OFDM signal. The estimated frequency offset is used for frequency down-conversion in the digital domain to obtain the baseband OFDM signal. With this method, all data-bearing subcarriers should fall into the OFDM bandwidth after frequency down-conversion. The validity of the method is confirmed by an experiment with 20 Gb/s OFDM-PON downstream transmission.
Keywords :
OFDM modulation; passive optical networks; DD-OFDM-PON downstream system; baseband OFDM signal; bit rate 20 Gbit/s; data-bearing subcarriers; direct detection orthogonal frequency division multiplexing passive optical network; wide-range frequency offset estimation; Estimation; Frequency estimation; OFDM; Optical filters; Optical modulation; Optical receivers; Passive optical networks; Frequency offset (FO); Optical fiber communication; Orthogonal frequency division multiplexing (OFDM); Passive optical network (PON);
Journal_Title :
Optical Communications and Networking, IEEE/OSA Journal of
DOI :
10.1364/JOCN.4.000565
