An anti-noise modem for visible light communication systems using the improved M-ary position phase shift keying |
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| Affiliation: | 1. Qingdao University, School of Electronic and Information Engineering, Ningxia Road, Qingdao 266071, China;2. Southeast University, School of Information Science and Engineering, 2 Sipailou, Nanjing 210096, China;3. Shanghai Dianji University, School of Electronic Information, Olive Road, Shanghai 200240, China;1. Laboratory of Optical Materials and Structures, Institute of Semiconductor Physics, SB RAS, Novosibirsk 630090, Russia;2. Functional Electronics Laboratory, Tomsk State University, Tomsk 634050, Russia;3. Laboratory of Single Crystal Growth, South Ural State University, Chelyabinsk 454080, Russia;4. Radio-Received and Radio-Transmitted Devices Department, Novosibirsk State Technical University, Novosibirsk 630073, Russia;5. Department of Electronic Devices, Novosibirsk State Technical University, Novosibirsk 630073, Russia;6. General Physics Department, Novosibirsk State Technical University, Novosibirsk 630073, Russia;1. Dept. of Electronics and Communication Engg, Institute of Engineering and Management (IEM), Gurukul Campus, Sector V, Kolkata, WB 700 091, India;2. Department of Electronics and Tele-Communication Engineering, Jadavpur University, Kolkata 700 032, India;1. Department of Electrical Engineering, Kermanshah Branch, Islamic Azad University, Kermanshah, Iran;2. Faculty of Engineering, Electrical Engineering Department, Razi University, Kermanshah, Iran;3. Young Researchers and Elite Club, Kermanshah Branch, Islamic Azad University, Kermanshah, Iran;1. Facultad de Matemáticas, Universidad Autónoma de Guerrero, Av. Lázaro Cárdenas S/N, Cd. Universitaria, Chilpancingo, Guerrero, Mexico;2. CONACyT-Tecnológico Nacional de México/CENIDET, Interior Internado Palmira S/N, Col. Palmira, C.P. 62490, Cuernavaca, Morelos, Mexico |
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| Abstract: | In this paper, we propose an anti-noise modem based on the improved M-ary position phase shift keying (MPPSK) for visible light communication (VLC) systems. The line spectral interferences in the original MPPSK are theoretically analyzed and approximately mitigated by adopting a set of improved waveform samples. Then, within one symbol duration, the peak envelopes of the received signals are captured at each of synchronization bit with a quantity of sampling offsets to improve the proportion of the reliable data tones. In addition, a novel demodulation scheme using an amplitude-position detector based on soft decision is proposed to recover the MPPSK symbols, which can minimize the contamination influence of channel noise on symbol decision. With this scheme, the false alarm error and wrong slot error caused by the multipath fading in VLC channel can be effectively corrected and the bit error rate (BER) performance of the system is significantly improved. Simulation results demonstrate that the proposed scheme reduce the required signal-to-noise ratio (SNR) at least by 2 dB for BER = 10−4, which show the feasibility and validity of this anti-noise modem. |
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| Keywords: | Visible light communication Anti-noise M-ary position phase shift keying Sampling offsets Soft decision |
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