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AssigneeQUALCOMM Incorporated
InventorsIvan Jesus Fernandez-Corbaton, Ahmad Jalali, Ernest T. Ozaki, Harris Smith Simon, Sherman A. Gregory
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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.
A method for mitigating antenna array pattern distortions in signals transmitted to different receivers, the method comprising
The method of 1, wherein selecting the first and second signals comprises:
The method of 1, wherein the second code is the spectrum inverted version of the first code.
The method of 1, wherein the first and second signals are transmitted in different directional beams.
A method for mitigating antenna array pattern distortions in signals transmitted to different receivers, the method comprising
A method for mitigating antenna array pattern distortions in signals transmitted to different receivers, the method comprising
An apparatus for mitigating antenna array pattern distortions in signals transmitted to different receivers, the apparatus comprising:
The apparatus of 8 further comprising:
The apparatus of 8, wherein the means for transmitting the first and second signals to different receivers on different beams include
An apparatus for mitigating antenna array pattern distortions in signals transmitted to different receivers, the apparatus comprising:
An apparatus for mitigating antenna array pattern distortions in signals transmitted to different receivers, the apparatus comprising:
A machine readable medium tangibly embodying instructions executable by a processor for mitigating antenna array pattern distortions in signals transmitted to different receivers, which when executed by a processor, causes the processor to perform operations comprising:
The machine readable medium of 13, wherein generating the first and second signals comprises:
A machine readable medium -tangibly embodying instructions executable by a processor for mitigating antenna array pattern distortions in signals transmitted to different receivers, which when executed by a processor, causes the processor to perform operations comprising:
A machine readable medium tangibly embodying instructions executable by a processor for mitigating antenna array pattern distortions in signals transmitted to different receivers, which when executed by a processor, causes the processor to perform operations comprising:
A wireless transmitter comprising:
The transmitter of 17 wherein the first and second signals are such that their cross-correlation is approximately zero or negligibly small.
The transmitter of 17 further comprising:
The transmitter of 17 further comprising:
The transmitter of 20 wherein the transmitter configures the directional antenna to
The transmitter of 17 wherein the transmitter is mounted on a moving aircraft and the first and second receivers are stationary.
The transmitter of 17 wherein the transmitter initiates a handoff procedure between the first and second receivers.
The transmitter of 23 wherein the processing circuit is further configured to transfer communications to the second receiver once a link is established with the second receiver.
The transmitter of 23 wherein the processing circuit is further configured to terminate communications with the first receiver once a link is established with the second receiver.
The transmitter of 17 wherein the processing unit is further configured to search for pilot signals from receivers on a plurality of beams.
The transmitter of 17 farther comprising:
A microprocessor comprising:
The microprocessor of 28 wherein the circuit is further configured to switch the antenna from a first direction to a second direction so that the first signal is transmitted in the first direction and the second signal is transmitted in the second direction.
The microprocessor of 28 wherein the circuit is further configured to
Dependencies are inferred from the claim text.