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Adaptive free space optical communication (FSO)-orthogonal frequency division multiplexing (OFDM) transmission system and transmission method

A technology of FSO-OFDM and transmission method, applied in transmission system, electromagnetic wave transmission system, free space transmission, etc., can solve the problem of low transmission efficiency of the system

Inactive Publication Date: 2011-01-26
XIAN TECHNOLOGICAL UNIV
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Problems solved by technology

[0004] The purpose of the present invention is to provide an adaptive FSO-OFDM transmission system, which solves the problem that the existing transmission system adopts a fixed modulation mode for all subcarriers, and the transmission efficiency of the system is low

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  • Adaptive free space optical communication (FSO)-orthogonal frequency division multiplexing (OFDM) transmission system and transmission method
  • Adaptive free space optical communication (FSO)-orthogonal frequency division multiplexing (OFDM) transmission system and transmission method
  • Adaptive free space optical communication (FSO)-orthogonal frequency division multiplexing (OFDM) transmission system and transmission method

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[0052] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0053] The structure of the adaptive FSO-OFDM transmission system of the present invention, such as figure 1 As shown, it includes an AOFDM transmitting part, an optical up-conversion module 8, an optical down-conversion module 9 and an AOFDM receiving part connected in sequence, and the AOFDM transmitting part includes a channel modeling module 1, an adaptive modulation module 2, and a serial-to-parallel conversion module connected in sequence a3, IFFT conversion module 4, loading guard interval module 5, parallel-to-serial conversion module a6, digital-to-analog conversion module 7, the AOFDM transmitting part is connected with the optical up-conversion module 8 through the digital-to-analog conversion module 7; the AOFDM receiving part includes sequentially connected Carrier frequency synchronization module 10, analog-to-digital conversion...

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Abstract

The invention discloses an adaptive free space optical communication (FSO)-orthogonal frequency division multiplexing (OFDM) transmission system. The transmission system comprises an adaptive orthogonal frequency division multiplexing (AOFDM) transmission part, an optical up-conversion module, an optical down-conversion module and an AOFDM receiving part which are sequentially connected. An adaptive FSO-OFDM transmission method of the invention has the advantages of expanding a carrier deviation estimation range and simultaneously solving problems on the estimation of carrier deviations underthe condition of inconsistency of each carrier deviation caused by the frequency-selective fading characteristic of an atmosphere channel by adopting a high-order cumulant-based carrier blind-synchronization algorithm, providing an effective way for improving a transmission rate and reducing the bit error rate of the system for free space optical communication by realizing the modeling of the optimal adaptive FSO-OFDM transmission system with maximum transmission capacity, and providing novel methods and theoretical bases for further improving the transmission efficiency of the adaptive system and improving system performance by adopting high-order cumulant-based blind channel estimation and blind signal detection technology.

Description

technical field [0001] The invention belongs to the field of communication technology, and specifically relates to an adaptive FSO-OFDM transmission system. The invention also relates to using the transmission system as a platform to accurately realize blind channel estimation, blind signal detection and subcarrier Transmission method for blind frequency estimation. Background technique [0002] Free space optical communication (FSO) is a technology that uses light beams as information carriers to realize point-to-point or point-to-multipoint information transmission in space. Due to the advantages of low cost, flexible networking, and no need for frequency license, this technology has become a major research hotspot in today's information technology. Although free space optical communication has been widely concerned by people, there are still some problems to be solved urgently: ①The transmission rate is limited. ②Atmospheric channel interference. In order to give full ...

Claims

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Application Information

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IPC IPC(8): H04L27/26H04L25/02H04B10/10H04B10/11
Inventor 赵黎雷志勇雷斌任安虎
Owner XIAN TECHNOLOGICAL UNIV
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