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Method for restraining multiplicative noise in wireless optical communication system

A wireless optical communication, multiplicative noise technology, applied in transmission systems, optical fiber radios, digital transmission systems, etc., can solve the problems of difficult implementation, reduce the effective data transmission rate, etc., to achieve convenient implementation, simple and easy-to-understand calculation process, The effect of high effective data transfer rate

Inactive Publication Date: 2013-05-08
XIAN UNIV OF TECH
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Problems solved by technology

[0004] The purpose of the present invention is to provide a method for suppressing multiplicative noise in a wireless optical communication system, which solves the problems of reducing the effective data transmission rate and difficult implementation in the prior art

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  • Method for restraining multiplicative noise in wireless optical communication system
  • Method for restraining multiplicative noise in wireless optical communication system
  • Method for restraining multiplicative noise in wireless optical communication system

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Embodiment Construction

[0019] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0020] figure 1 As the specific process block diagram of this method, the complete steps of this method are introduced in detail below:

[0021] 1) Randomly generate a set of binary symbols s(n), perform 4PSK modulation on s(n), and generate modulated signal x(n);

[0022] 2) Use instruments to measure the multiplicative noise value z(n) in the atmospheric channel under various weather conditions (such as heavy rain, moderate rain, light rain, overcast, fog, etc.);

[0023] 3) Perform channel estimation on the atmospheric channel to obtain the estimated atmospheric channel transfer function h(n), and its Fourier transform is H(e jω ) (The channel estimation method used here is a step-by-step estimation, that is, first estimate the data from 1 to 128, and take the first 128 estimated values; then estimate the data from 2 to 129, and take the...

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Abstract

The invention discloses a method for restraining multiplicative noise in a wireless optical communication system. The method for restraining multiplicative noise in the wireless optical communication system includes the following steps: firstly, binary code elements transmitted by an information source are modulated after being encoded, and modulated signals pass air information channel are influenced by multiplicative noise, secondly, the signals are converted to a frequency domain, and original modulating signals are elicited through measured noise value and evaluated received signals in a deconvolution method, at last the modulating signals are demodulated and coded again and the multiplicative noise of the modulating signals is filtered. According to the method for restraining multiplicative noise in the wireless optical communication system, the deconvolution method is applied in wireless laser communication, defects in other deconvolution methods are overcome, assumed conditions are of no need, the method is coordinated with actual physical processes, and calculation process is simple and easy to understand.

Description

technical field [0001] The invention belongs to the technical field of electronic information communication, and relates to a method for filtering multiplicative noise in atmospheric channels by deconvolution. Background technique [0002] Channel noise directly affects the transmission quality of signals in the channel. How to obtain real signals from observations containing signal distortion and noise is a problem of great concern to engineering and academia. The research on this problem can be said to have started from the time when the communication technology appeared. According to the form of noise in the channel, it can be divided into additive noise and multiplicative noise. Among them, multiplicative noise is a kind of interference that depends on the existence of useful signals. The influence on the signal is reflected in a multiplicative relationship, and the changes are more complicated. It usually includes various linear distortions, nonlinear distortions, and ...

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Application Information

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IPC IPC(8): H04L1/00H04L25/03H04B10/2575
Inventor 柯熙政谌娟
Owner XIAN UNIV OF TECH
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