Symmetric Training Sequence-Based copyright Frequency Offset Estimation Scheme for Coherent Free-Space Optical Communication

In this paper, a symmetric training sequence-based (STSB) copyright frequency offset estimation (FOE) scheme for coherent free-space optical (CFSO) communication is proposed.In the proposed technique, we exploit the training-sequence-based (TSB) copyright FOE algorithm to the CFSO communication system in the quadrature phase-shift keying (QPSK) mod

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