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Study and Realization of the Key Techniques of HF/VHF Communication Signal Analysis

Author: LiuMing
Tutor: JiangZuo
School: PLA Information Engineering University
Course: Circuits and Systems
Keywords: Watterson model Complex modulation Multiplicative complex modulation Multi-Tone Parallel Modulation recognition Parameter estimation Estimated number of subcarriers
CLC: TN911.6
Type: Master's thesis
Year: 2010
Downloads: 106
Quote: 1
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Abstract


With the development of communication technology, high frequency / very high frequency (HF / VHF) communication of many new modulation technical and institutional, such as the complex modulation techniques, and multi-tone parallel system, makes this band radio monitoring and signal analysis becomes more difficult. Studied from the point of view of the non-cooperative communication the multiplicative complex modulated signals and multi-tone parallel signal modulation recognition and parameter estimation problem, and in a general purpose signal processing platform system implementation of the algorithm. The main contents are as follows: 1, through simulation Watterson HF channel model to analyze the channel multipath effects, Doppler shift and Doppler spread and complex time-varying factors on the signal and some of the existing modulation recognition algorithm for subsequent signal modulation analysis laid the foundation for the selection and improvement of the algorithm. 2, start from the the multiplicative complex modulation principle and mathematical model to analyze the impact of digital carrier modulation scheme and symbol rate and other parameters of the the multiplicative complex modulation signal; derive multiplicative the outer layer of the composite modulated signal modulation characteristics, two reflect the multiplicative complex modulation characteristic parameters to achieve the distinction between multiplicative composite modulated signal with non-multiplicative composite modulated signal; extraction based on the the cyclostationary signal nonlinear transformation discrete lines characteristics to achieve a multiplicative composite modulated signal distinction within the class; finally designed and implemented based on decision tree strategy classifier, online classifieds completed the multiplicative complex modulation signal. Simulation results show that the features extracted in this article has a good resistance to multipath fading performance, better signal classification and recognition under the the channel complex time-varying factors. 3, based on the multiplicative composite modulated signal characteristics of the digital carrier, improve the accurate estimation of the centroid based on the frequency domain signal carrier frequency estimation algorithm, the the multiplicative complex modulation signal carrier frequency. According to the Cyclostationarity theory, analyzed the symbol rate estimation method based on signal nonlinear transformation deduced multiplicative complex modulated signal symbol rate and non-linear transformation characteristic lines of the correspondence between extract the discrete line positions multiplicative complex modulated signal symbol rate fast, accurate estimates. 4, HF / VHF band multi-tone signal in parallel parameter estimation problem. Parallel multi-tone signal power spectral density in certain circumstances to render the shape of the cosine function characteristics obtained by derivation of the analysis, cepstrum analysis method, the parallel signals the number of subcarriers in the frequency band of several multi-tone estimated . 5, on the basis of the above-mentioned study, initially built the system, system performance tests show that, in this study, the algorithm is better able to complete the actual HF / VHF channel environment communication signal analysis.

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CLC: > Industrial Technology > Radio electronics, telecommunications technology > Communicate > Communication theory > Signal analysis
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