Large delay spread channel simulator

Details Large delay spread channel simulator Large delay spread channel simulator

1976-02-02

1978-08-08

Smith, Alfred E.

Wave transmission lines and networks

Coupling networks

Balanced to unbalanced circuits

333 70T, H03H 714, H03H 722, H03H 728, H03H 730

Patent

active

041059581

ABSTRACT:
An apparatus for simulating the characteristics of a signal channel which uses two or more cascaded delay lines each of which in one embodiment has a single input and a plurality of tapped outputs. The tapped output signals from each delay line are each multiplied by randomly characterized signals and the multiplied signals are combined to supply an input signal to the next succeeding delay line. The input signal to the first of the cascaded delay lines is the channel input signal and the output of the last of the cascaded delay lines is the simulated channel output signal. The randomly characterized signals associated with all but one of the delay lines may be signals having random polarities or having random phases while the randomly characterized signals associated with the remaining one of the delay lines has Gaussian characteristics. Appropriate control of the amplitude of the Gaussian characterized signals permits an approximation to be made of the energy distribution of the signal channel which is being simulated.

REFERENCES:
patent: 3271703 (1966-09-01), Kaenel
patent: 3597541 (1971-08-01), Proakis et al.
patent: 3624562 (1971-11-01), Fujimura

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