Telecommunications – Transmitter – Noise or interference elimination
Reexamination Certificate
2005-07-15
2009-10-27
Urban, Edward (Department: 2618)
Telecommunications
Transmitter
Noise or interference elimination
C455S440000, C455S443000, C370S208000
Reexamination Certificate
active
07610025
ABSTRACT:
At least one feature provides a way to perform point-to-multipoint transmissions using adaptive or directional antennas while reducing antenna pattern distortion. Generally, rather than transmitting the same waveform to two or more receivers, an information-bearing signal is transformed into different decorrelated waveforms and each decorrelated waveform is transmitted to a different receiver. In one implementation, an information-bearing signal is transformed into two decorrelated signals such that their crosscorrelation, or autocorrelation of the information-bearing signal, is zero or very small. Such decorrelation may be achieved by sending a first signal to a first receiver while sending a second signal, having a radio frequency spectrum that is the spectrally inverted version of the first signal, to a second receiver. In another implementation, a first signal is transmitted to a first receiver and is also transmitted to a second receiver with a time delay.
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Fernandez-Corbaton Ivan Jesus
Gregory Sherman A.
Jalali Ahmad
Ozaki Ernest T.
Simon Harris Smith
Hannon Christian A
Qualcomm Incorporated
Turocy & Watson LLP
Urban Edward
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