[TuB3] Coding and Equalization

[TuB3-3] Experimental Comparison of Pulse Position and Hamming-Coded Modulations for High Sensitivity Coherent FSO Communications

Keisuke Matsuda, 〇Shota Koshikawa, Masashi Binkai, Tsuyoshi Yoshida, Naoki Suzuki (Mitsubishi Electric Corporation, Japan)

キーワード：Free space optical communications, Coherent communications

We experimentally compared 4PPM-QPSK and Hamming-coded QPSK for coherent FSO applications with low symbol rates. Carrier recovery in 4PPM-QPSK works better because of the higher per-symbol power at pulses, leading to 1.1 dB better sensitivity.