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Mao Y C, Wang H Q, Zhang Y, et al. Research status and development of optical spatial modulation technology[J]. Opto-Electron Eng, 2020, 47(3): 190712. doi: 10.12086/oee.2020.190712
Citation: Mao Y C, Wang H Q, Zhang Y, et al. Research status and development of optical spatial modulation technology[J]. Opto-Electron Eng, 2020, 47(3): 190712. doi: 10.12086/oee.2020.190712
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Research status and development of optical spatial modulation technology

  • School of Computer and Communication, Lanzhou University of Technology, Lanzhou, Gansu 730050, China

    • Fund Project: Supported by National Natural Science Foundation of China (61861026, 61875080)
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Received Date 27 November 2019
Revised Date 24 February 2020
Published Date 01 March 2020
    Abstract
  • Optical spatial modulation (OSM), a new optical multiple input multiple output (OMIMO) technique, effectively improves the transmission rate and energy efficiency by using the spatial domain laser index to carry additional information. Meantime, since only one laser is activated per symbol duration to transmit information, the problems of channel interference and synchronization are solved in traditional OMIMO system. This paper firstly introduces several OSM technologies and summarizes their research status both at home and abroad. Nextly, the OSM, optical space shift keying (OSSK), enhanced optical spatial modulation (EOSM) and differential optical spatial modulation (DOSM) schemes are compared and analyzed in terms of transmission rate, spectral efficiency, bit error rate (BER) and complexity. Finally, the key problems and future development direction are pointed out in OSM system.
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    • Overview

  • Overview: As a novel access network technology, wireless optical communication (WOC) has sparked great interests in the field. Compared with RF, there are significant advantages, such as high bandwidth, inherent security and ease of installation. However, the channel fading caused by atmospheric turbulence and complex channel environment is the main factor affecting the performance of WOC system. Therefore, OMIMO system comes into being and makes use of spatial diversity at receiver and transmitter to overcome the performance influence caused by link fading. When multiple lasers are activated simultaneously, the problems of inter-channel interference (ICI) and inter antenna synchronization (IAS) limit the promotion and development of OMIMO system. Optical spatial modulation (OSM) is a novel OMIMO scheme which conveys information over both signal and space simultaneously. OSM effectively improves the transmission rate and energy efficiency by using the spatial domain laser index to carry additional information. Since only one laser is activated per symbol duration to transmit information, the problems of channel interference and synchronization are solved in traditional OMIMO system, and complexity and link cost of proposed OSM scheme are decreased. Based on the above advantages, OSM is an OMIMO technology with broad development prospects and can be applied in various occasions. In the field of RF, the idea of SM has been developed rapidly and rich research results have been obtained. Compared with RF field, OSM is still in the exploration stage. In this paper, we introduce four kinds of schemes of OSM, optical space shift keying (OSSK), enhanced optical spatial modulation (EOSM) and differential optical spatial modulation (DOSM) from basic principle to research status both at home and abroad. OSSK is a simple form of OSM, which only uses the index of the laser to transmit information. EOSM effectively increases the transmission rate by activating a small number of lasers. And EOSM overcomes in a novel fashion the constraint in OSM that the number of lasers has to be a power of two. DOSM can effectively avoid complex channel estimation and obtain better performance under high mobility scenarios. In terms of transmission rate, spectral efficiency, bit error rate (BER) and complexity, four kinds of OSM scheme are compared and analyzed. It is noticed from analysis that different OSM schemes have their own characteristics and advantages, so they are selected according to the specific situation in practical application. In short, with the requirement of high capacity and high-speed communication system, OSM scheme is expected to be an alternative to next generation communications technology. It has significant application prospect in the future for massive MIMO user and multi-user multi-cell MIMO communication.

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