A Blind Channel Estimation for 100+ Gb/s Optical IM-DD DMT Over 100-km SMF in 1550 nm

Abstract

A blind and adaptive decision-feedback channel estimation method is proposed for optical intensity-modulated direct detection discrete multitone transmissions. Due to the channel state variation nature of the fiber, periodic channel estimation update is required. In previous works, periodic preambles are transmitted to acquire and track the channel state information at the receiver. In the proposed method, instead of using periodic preambles, the estimated channel is updated adaptively after decoding a sequence of orthogonal frequencydivision multiplexing symbols using least-squares and minimum mean-square error criteria. The simulation results corroborate that the proposed method increases data-rate by 10%, and at the same time provides 0.24-dB Q-factor gains that can be converted into extra 2% data-rate increase, algorithm simplicity, or cost reduction.

A Review Based on Channel Estimation for Optical - Orthogonal Frequency Division Multiplexing

“…The BCE technique use the statistical data of received symbols [16]. The major advantage of BCE is that it consumes high-level bandwidth, but it limited to slow time-varying channels, and more complex at the receiver.…”

“…OFDM has been significantly studied in the mobile communication to combat the hostile frequency selective fading and incorporated into wireless communication standards (HiperLAN2, 802. 16 WiMAX digital audio and video broadcasting (DVB-T, and DAB) in Europe, and Australia [1]. Presently, an equivalent optical-domain multi-carrier format known as coherent OFDM [2], considered as a promising technique for long-haul optical communication systems due to its more spectral efficiency and robustness against polarization mode dispersion and chromatic dispersion [3], [4].…”