Pulse or digital communications – Receivers – Interference or noise reduction
Patent
1997-09-29
2000-02-15
Chin, Stephen
Pulse or digital communications
Receivers
Interference or noise reduction
375299, 455 523, 455101, 455562, H04B 710
Patent
active
060261323
ABSTRACT:
A wireless transmitter is disclosed that mitigates the 3 MPH effect, which is the phenomenon of poor received signal quality at a wireless receiver because neither transmit power control nor data interleaving are capable of overcoming the effects of Rayleigh fading. Some of the wireless transmitters disclosed mitigate the 3 MPH effect by having the transmit antenna move mechanically, as on a turntable. Other transmitters achieve the same effect by moving the phase center of the transmitted signal between two or more stationary antennas. The phase center of the transmitted signal can be made to move between stationary antennas by electronically manipulating and varying the amount of signal radiated by each antenna. In an illustrative embodiment of the present invention, a signal to be transmitted is switched back and forth between two stationary antennas at a rate that creates virtual motion as observed by the wireless terminal sufficient to remove the wireless terminal from the depths of the 3 MPH effect.
REFERENCES:
patent: 5305353 (1994-04-01), Weerackody
patent: 5457712 (1995-10-01), Weerackody
patent: 5715516 (1998-02-01), Howard et al.
patent: 5745858 (1998-04-01), Sato et al.
patent: 5781845 (1998-07-01), Dybdal et al.
patent: 5842118 (1998-11-01), Wood
patent: 5848103 (1998-12-01), Weerackody
Chin Stephen
Fan Chieh M.
Lucent Technologies - Inc.
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