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In this paper, we propose an improved pilot-based blind (PBB) phase estimation method named mixed-polar-amplitude-modulation (MPAM-PBB) method for coherent optical orthogonal frequency-division multiplexing (CO-OFDM). In the previous PBB methods, all the selected so-called pilot subcarriers (PSs) are loaded with bipolar amplitude modulation (AM) format signal. In MPAM-PBB method, half of the selected...
In this paper, a pilot-based blind (PBB) phase estimation method for coherent optical orthogonal frequency-division multiplexing (CO-OFDM) is proposed. Instead of inserting the pilot-subcarriers that are loaded with the already known information in the OFDM signal, the unknown and specially designed signal is used to replace the signal on the pilot subcarriers to decrease the waste of spectrum and...
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