Pulse or digital communications – Repeaters – Testing
Patent
1991-11-27
1993-03-02
Cangialosi, Salvatore
Pulse or digital communications
Repeaters
Testing
455 523, H04L 104, H04B 110, H04B 1500
Patent
active
051915944
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 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.
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Argo Paul E.
Fitzgerald T. Joseph
Cangialosi Salvatore
Gaetjens Paul D.
Moser William R.
The United States of America as represented by the United States
Wilson Ray G.
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