Method for employing multipath propagation in wireless radio...

Details Method for employing multipath propagation in wireless radio... Method for employing multipath propagation in wireless radio...

2005-06-03

2008-10-21

Ferguson, Keith T (Department: 2618)

Telecommunications

Transmitter and receiver at separate stations

Plural transmitters or receivers

C455S504000, C455S501000, C455S500000, C455S067160, C455S067150, C343S702000, C343S703000, C342S370000, C342S368000

Reexamination Certificate

active

07440766

ABSTRACT:
A method of employing multipath propagation in wireless radio communications uses an omnidirectional transmitting/receiving antenna at one end of a transmission link to send an interrogating signal across an environment subject to multipath disturbances to a phase-conjugating retrodirective antenna, and the retrodirective antenna returns a communication signal along the multiple pathways taken by the interrogating signal to the omnidirectional antenna despite the multipath disturbances. In a simplex communication mode, the retrodirective antenna sends a return signal mixed with a communication signal to the omnidirectional antenna. In a duplex communication mode, both an omnidirectional antenna and a phase-conjugating retrodirective antenna are operated in tandem at each end of the transmission link to provide effective two-way wireless radio transmissions.

REFERENCES:
patent: 4985707 (1991-01-01), Schmidt et al.
patent: 5064140 (1991-11-01), Pittman
patent: 5781845 (1998-07-01), Dybdal
patent: 6415163 (2002-07-01), Keskitalo et al.
patent: 2002/0172269 (2002-11-01), Xu

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