Fading channel simulator
Abstract
Fading channel effects on a transmitted communication signal are simulated with both frequency and time variations using a channel scattering function to affect the transmitted signal. A conventional channel scattering function is converted to a series of channel realizations by multiplying the square root of the channel scattering function by a complex number of which the real and imaginary parts are each independent variables. The twodimensional inverseFFT of this complexvalued channel realization yields a matrix of channel coefficients that provide a complete frequencytime description of the channel. The transmitted radio signal is segmented to provide a series of transmitted signal and each segment is subject to FFT to generate a series of signal coefficient matrices. The channel coefficient matrices and signal coefficient matrices are then multiplied and subjected to inverseFFT to output a signal representing the received affected radio signal. A variety of channel scattering functions can be used to characterize the response of a transmitterreceiver system to such atmospheric effects.
 Inventors:
 (Los Alamos, NM)
 Publication Date:
 Research Org.:
 Los Alamos National Laboratory (LANL), Los Alamos, NM
 OSTI Identifier:
 868688
 Patent Number(s):
 US 5191594
 Assignee:
 United States of America as represented by United States (Washington, DC) LANL
 DOE Contract Number:
 W7405ENG36
 Resource Type:
 Patent
 Country of Publication:
 United States
 Language:
 English
 Subject:
 fading; channel; simulator; effects; transmitted; communication; signal; simulated; frequency; time; variations; scattering; function; affect; conventional; converted; series; realizations; multiplying; square; root; complex; imaginary; independent; variables; twodimensional; inversefft; complexvalued; realization; yields; matrix; coefficients; provide; complete; frequencytime; radio; segmented; segment; subject; fft; generate; coefficient; matrices; multiplied; subjected; output; representing; received; affected; variety; functions; characterize; response; transmitterreceiver; atmospheric; signal representing; scattering function; transmitted signal; channel scattering; fading channel; time variation; communication signal; atmospheric effects; /375/455/
Citation Formats
Argo, Paul E., and Fitzgerald, T. Joseph. Fading channel simulator. United States: N. p., 1993.
Web.
Argo, Paul E., & Fitzgerald, T. Joseph. Fading channel simulator. United States.
Argo, Paul E., and Fitzgerald, T. Joseph. 1993.
"Fading channel simulator". United States.
doi:. https://www.osti.gov/servlets/purl/868688.
@article{osti_868688,
title = {Fading channel simulator},
author = {Argo, Paul E. and Fitzgerald, T. Joseph},
abstractNote = {Fading channel effects on a transmitted communication signal are simulated with both frequency and time variations using a channel scattering function to affect the transmitted signal. A conventional channel scattering function is converted to a series of channel realizations by multiplying the square root of the channel scattering function by a complex number of which the real and imaginary parts are each independent variables. The twodimensional inverseFFT of this complexvalued channel realization yields a matrix of channel coefficients that provide a complete frequencytime description of the channel. The transmitted radio signal is segmented to provide a series of transmitted signal and each segment is subject to FFT to generate a series of signal coefficient matrices. The channel coefficient matrices and signal coefficient matrices are then multiplied and subjected to inverseFFT to output a signal representing the received affected radio signal. A variety of channel scattering functions can be used to characterize the response of a transmitterreceiver system to such atmospheric effects.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = 1993,
month = 1
}

This invention relates to high frequency (HF) radio signal propagation through fading channels and, more particularly, to simulation of fading channels in order to characterize HF radio system performance in transmitting and receiving signals through such fading channels. Fading channel effects on a transmitted communication signal are simulated with both frequency and time variations using a channel scattering function to affect the transmitted signal. A conventional channel scattering function is converted to a series of channel realizations by multiplying the square root of the channel scattering function by a complex number of which the real and imaginary parts are eachmore »

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