Layered optical spatial modulation method suitable for turbulent flow channel

An optical space modulation and channel technology, applied in the field of wireless optical communication, can solve problems such as inability to be used directly and limitation of spectrum efficiency, and achieve the effect of ensuring system bit error performance, improving system spectrum efficiency and transmission rate

Active Publication Date: 2019-06-14
LANZHOU UNIVERSITY OF TECHNOLOGY
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Problems solved by technology

However, the system only uses the serial number of the active antenna to transmit information, so its spectral efficiency is limited
At the same time, since most wireless optical commun...

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  • Layered optical spatial modulation method suitable for turbulent flow channel
  • Layered optical spatial modulation method suitable for turbulent flow channel
  • Layered optical spatial modulation method suitable for turbulent flow channel

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Embodiment Construction

[0009] The invention proposes a layered optical spatial modulation method suitable for turbulent channels. This method simultaneously activates two lasers respectively modulated by PPM and PAM, which greatly improves the spectral efficiency and transmission rate of the system. The present invention will be described in detail below with specific implementation in conjunction with the accompanying drawings.

[0010] The present invention achieves through following technical measures:

[0011] For one with N t lasers (LD), N r A layered optical spatial modulation (LOSM) system of photodetectors, the system model is as follows figure 1 shown. The binary information bit stream at the sending end is converted into a two-layer modulation signal after LOSM modulation. Among them, the first layer signal uses spatial pulse amplitude modulation SPAM, and the second layer uses spatial pulse position modulation SPPM. The two-layer modulation signal is sent out by the optical transmi...

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Abstract

The invention discloses a layered optical spatial modulation method suitable for a turbulent flow channel. The layered optical spatial modulation method mainly comprises layered optical space modulation layer mapping and bit mapping methods, receiving end signal detection and demapping and layered optical space modulation system bit error rate upper bound calculation. The layer mapping is to divide input bit information into two layers, the bit mapping is to determine an LD serial number and a pulse amplitude or a pulse position activated by each layer according to a mapping rule, and two lasers modulated by PPM and PAM are activated at the same time to send information; and the receiving end adopts a maximum likelihood decoding detection algorithm to complete detection of the laser serialnumber and the digital modulation signal, and the transmitting end bit information can be recovered after corresponding reflection and emission. On this basis, the upper bound of the bit error rate of layered optical space modulation is derived. The construction of the layered light space modulation system effectively improves the spectrum efficiency and transmission rate of the system.

Description

technical field [0001] The invention relates to a layered optical space modulation method for a turbulent channel. The method further improves the spectral efficiency and transmission rate of the optical space modulation by combining multiplexing technology with different modulation modes, and belongs to the technical field of wireless optical communication. Background technique [0002] With the rapid growth of user terminals and the sharp increase in the amount of various business data, people put forward higher requirements for the capacity and transmission rate of wireless optical communication systems. the goal that is pursued. Optical multiple-input multiple-output (MIMO) technology increases system capacity and reliability by using multiple antennas to simultaneously transmit data to a receiver. However, in traditional MIMO technology, due to problems such as inter-channel interference and difficulty in synchronization between antennas, its promotion and application ...

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Application Information

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IPC IPC(8): H04B10/516H04B10/524H04B10/50
Inventor 王惠琴李亚婷曹明华包仲贤豆红霞毛一聪武鑫
Owner LANZHOU UNIVERSITY OF TECHNOLOGY
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