Joint adaptive code rate technique and bit interleaver for direct-detection optical OFDM system |
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| Affiliation: | 1. Dept. of Physics and Astronomy, Uppsala University, P. O. Box 516, SE-75120 Uppsala, Sweden;2. Institute of Applied and Physical Chemistry, University of Bremen, Box 33 04 40, D-28359 Bremen, Germany;3. Dept. of Physics, Norwegian University of Science and Technology (NTNU), NO-7491 Trondheim, Norway;4. VG Scienta, Uppsala, SE-752 28, Sweden;5. Chemical Physics, Dept. of Chemistry, Lund University, P.O. Box 124, SE-221 00 Lund, Sweden;6. MAX-IV Laboratory, Lund University, P.O. Box 118, SE-221 00 Lund, Sweden;1. Departamento de Química Física, Facultad de Química, Universidad de Sevilla, C/Profesor García González 1, E-41012 Sevilla, Spain;2. Departament de Química Física & Institut de Química Teòrica i Computacional (IQTCUB), Universitat de Barcelona, C/Martí i Franquès 1, E-08028 Barcelona, Spain;3. Departamento de Química, Universidad de Las Palmas de Gran Canaria, Campus Universitario de Tafira, 35017 Las Palmas de Gran Canaria, Spain;4. INAEL Electrical Systems S.A., C/Jarama 5, 45007 Toledo, Spain |
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| Abstract: | In this paper, we have theoretically analyzed that the existence of inter-subcarrier mixing interferences (ISMI) and frequency selective fading (FF) in the directed-detection optical orthogonal-frequency-division-multiplexing (DDO-OFDM) system will cause an unbalanced error distribution and degrade the system performance. Then we propose to employ the adaptive code rate technique (ACT) and bit interleaver in the DDO-OFDM system to combat ISMI and FF. The experimental results show that the receiver sensitivity of 5.9-Gb/s 64-ary quadrature-amplitude-modulation (64QAM) OFDM signal employing ACT(9.43 Gb/s after encoding) is improved more than 2 dB compared with the 5.9-Gb/s OFDM signal with 0.66 turbo coding rate (8.85 Gb/s after encoding) at the bit-error ratio (BER) of 1e-4. When the coding rate is all 0.625, the OFDM signal employing ACT has more than 1-dB gain improvement compared with the OFDM signal encoded with fixed-rate turbo coding. And additional ～1-dB receiver sensitivity improvement is enabled when the OFDM signal employ ACT and bit-interleaver simultaneously. |
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