Title: Frequency Offset Estimation With Multi-Steps Interpolation for Coherent Optical Systems
Abstract: We investigate a frequency offset estimation (FOE) algorithm based on improved fast Fourier transform (FFT) for coherent optical systems. The algorithm implements FFT operation with a small number of samples and then adopts multi-steps interpolation with the increasing number of samples to improve the estimation accuracy gradually. In a 28-GBd coherent quaternary phase-shift keying system, simulation results show that the proposed algorithm reaches the same estimation accuracy with least-squares FOE algorithm that utilizes 64 time spans (LS-64) under the same total number of samples L. But the number of complex multiplications required by the proposed algorithm is just 7.26% and 6.75% of that required by LS-64 at L = 1024 and L = 2048, respectively.
Publication Year: 2015
Publication Date: 2015-10-01
Language: en
Type: article
Indexed In: ['crossref']
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Cited By Count: 11
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