Spectrum-Efficient Coherent Optical Zero Padding OFDM for Future High-Speed Transport Networks
By fully exploiting the optical channel properties, the authors propose in this paper the Coherent Optical Zero Padding Orthogonal Frequency Division Multiplexing (CO-ZP-OFDM) for future high-speed optical transport networks to increase the spectral efficiency and improve the system reliability. Unlike the periodically inserted training symbols in conventional optical OFDM systems, they design the Polarization-Time-Frequency (PTF) coded pilots scattered within the time-frequency grid of the ZP-OFDM payload symbols to realize low-complexity Multiple-Input Multiple-Output (MIMO) channel estimation with high accuracy. Compared with conventional optical OFDM systems, CO-ZP-OFDM improves the spectral efficiency by about 6.62%.
Provided by: Tsihai Topic: Mobility Date Added: Nov 2012 Format: PDF