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Research on the Recognition Algorithm of FH Signals

Author: LiuYanJie
Tutor: SunZuo
School: Dalian University of Technology
Course: Communication and Information System
Keywords: Hopping Time-frequency analysis Parameter estimation RSPWVD GNU Radio USRP
CLC: TN914.41
Type: Master's thesis
Year: 2010
Downloads: 191
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Abstract


Frequency-hopping communication as the means of communication of the rapid development in recent years , due to its excellent performance and interference in military communications and civilian communication has been widely used. Especially in electronic countermeasures in order to be able to occupy a favorable situation , not only requires the ability to transfer one's own secret security , but also intercepted the enemy as much as possible . Then estimated the parameters of frequency hopping signal has become an important research direction in recent years in the field of communication . Hopping signal is typical of non-stationary signals , the traditional method of signal analysis is no longer applicable , we use both to reflect the spectrum of the signal information , but also to reflect the spectrum when laws change over time - frequency distribution jump The frequency signal is analyzed . Wigner-Ville distribution ( WVD ) is one of the commonly used time-frequency distribution , however, for a multi - frequency components of the signal , the WVD have serious cross- term interference . In order to suppress cross- term interference , the WVD window treatment , but this windowing smoothing , while suppressing cross terms , but also reduce the frequency concentration . In this paper, a new time -frequency distribution - restructuring smoothed pseudo Wigner-Ville distribution ( RSPWVD ) , this method can reduce the cross terms , to get good signal component aggregation . So far , most of the simulation for frequency-hopping signal parameters are estimated only through software , source and channel information are hypothetical , not real information . Based on this problem, this paper is based on the GNU Radio and USRP hardware peripherals software defined radio platform as a simulation environment to realize the true frequency hopping signal transmission , receive as well as to estimate the parameters of frequency hopping signal simulation analysis . In this paper, frequency-hopping signal parameter estimation problem , first introduced the three common time-frequency distribution, and one distribution to estimate the parameters of frequency hopping signal , in order to improve performance , we use a rearrangement of the frequency distribution of hopping signal analysis, the final parameter estimation results obtained by simulation of the frequency hopping signal recognition algorithm based on the GNU Radio and USRP software radio platform , and this estimate the performance of the algorithm based on time-frequency distribution frequency hopping parameters were analyzed .

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CLC: > Industrial Technology > Radio electronics, telecommunications technology > Communicate > Communication systems ( transmission system) > Frequency hopping spread spectrum communication system > Frequency hopping communication
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