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Title: Fading channel simulator

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 two-dimensional inverse-FFT of this complex-valued channel realization yields a matrix of channel coefficients that provide a complete frequency-time 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 inverse-FFT 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 transmitter-receiver system to such atmospheric effects.
Authors:
 [1] ;  [1]
  1. (Los Alamos, NM)
Publication Date:
OSTI Identifier:
868688
Report Number(s):
US 5191594
DOE Contract Number:
W-7405-ENG-36
Resource Type:
Patent
Research Org:
Los Alamos National Laboratory (LANL), Los Alamos, NM
Country of Publication:
United States
Language:
English
Subject:
fading; channel; simulator; fading; channel; effects; transmitted; communication; signal; simulated; frequency; time; variations; channel; scattering; function; affect; transmitted; signal; conventional; channel; scattering; function; converted; series; channel; realizations; multiplying; square; root; channel; scattering; function; complex; imaginary; independent; variables; two-dimensional; inverse-fft; complex-valued; channel; realization; yields; matrix; channel; coefficients; provide; complete; frequency-time; channel; transmitted; radio; signal; segmented; provide; series; transmitted; signal; segment; subject; fft; generate; series; signal; coefficient; matrices; channel; coefficient; matrices; signal; coefficient; matrices; multiplied; subjected; inverse-fft; output; signal; representing; received; affected; radio; signal; variety; channel; scattering; functions; characterize; response; transmitter-receiver; atmospheric; effects; signal representing; scattering function; scattering function; scattering function; scattering function; transmitted signal; transmitted signal; channel scattering; channel scattering; channel scattering; channel scattering; fading channel; fading channel; time variation; communication signal; atmospheric effects /375/455/