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AssigneeQUALCOMM Incorporated
InventorsIvan Fernandez-Corbaton, Ahmad Jalali, Ernest Ozaki, Harris Simon, Sherman Gregory
Estimating the term…
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 selecting the first and second signals comprises:
The method of 3, wherein the second code is the spectrum inverted version of the first code.
The method of 1, wherein selecting the first and second signals comprises:
The method of 1, wherein selecting the first and second signals comprises:
The method of 1, wherein the first and second signals are transmitted in different directional beams.
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 generating the first and second signals comprises:
The apparatus of 8, wherein the means for generating the first and second signals comprises:
The apparatus of 8, wherein the means for generating the first and second signals comprises:
The apparatus of 8, wherein the means for transmitting the first and second signals to different receivers on different beams include
A machine readable medium comprising 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 14, wherein generating the first and second signals comprises:
The machine readable medium of 14, wherein generating the first and second signals comprises:
The machine readable medium of 14, wherein generating the first and second signals comprises:
The machine readable medium of 14, wherein generating the first and second signals comprises:
A wireless transmitter comprising:
The transmitter of 19 wherein the first and second signals are such that their cross-correlation is approximately zero or negligibly small.
The transmitter of 19 wherein the first and second signals are generated by one of either:
The transmitter of 21 further comprising:
The transmitter of 19 further comprising:
The transmitter of 23 wherein the transmitter configures the directional antenna to
The transmitter of 19 wherein the transmitter is mounted on a moving aircraft and the first and second receivers are stationary.
The transmitter of 19 wherein the transmitter initiates a handoff procedure between the first and second receivers.
The transmitter of 26 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 26 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 19 wherein the processing unit is further configured to
The transmitter of 19 further comprising:
A method for receiving signals comprising:
The method of 31 further comprising:
The method of 31 further comprising:
The method of 31 further comprising:
A machine readable medium comprising instructions executable by a processor for receiving signals from a transmitter, which when executed by a processor, causes the processor to perform operations comprising:
A microprocessor comprising:
The microprocessor of 36 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 36 wherein the circuit is further configured to generate the first and second signals by either:
The microprocessor of 38 wherein the circuit is further configured to
Dependencies are inferred from the claim text.