Method and system for use of quadrature hybrids for closed and open loop beam forming transmit diversity
AssigneeGoogle Inc.
InventorsKenneth Kludt, Haim Harel
Life of this patent
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Abstract
The present implementation is directed to a system and method of mobile transmit diversity and, more particularly, to a device which can operate in any of several modes, including a transmit diversity mode whereby two or more antennae transmit signals to at least one base station with relative phase difference, or in a non-diversity mode whereby one antenna is turned off and the other transmits at full or requisite power.
Claims32
A method for a multi-mode mobile device in a mobile communication system to transmit signals to a base station, where said device includes a phase shifter, a power combiner/divider, and a plurality of antennae with each antenna coupled to a power amplifier, comprising the steps of:
- providing a plurality of signals to said power combiner/divider for adjusting the power level of each of said plurality of signals;
- delivering one of each of said signals to a different antenna in said plurality of antennae;
- transmitting a single one of said signals in a non-diversity mode wherein said one of said signals is provided with full power and other signals of said plurality of signals are provided with no power, and continuing to transmit said single one of said signals in the non-diversity mode after said device receives a discernable indicator that said single one of said signals was received;
- and
- transmitting said plurality of said signals in a diversity mode in which said power combiner/divider adjusts the power level of each of said signals of said plurality of signals and said phase shifter determines a need to adjust the relative phase of said signals and adjust the relative phase when said device receives a subsequent non-discernable indicator or receives no indicator in response to said transmission of said single one of said signals.
A multi-mode mobile device for delivering signals to a base station, comprising:
- a power combiner/divider adapted to adjust the power level of each signal in a plurality of signals;
- a processor adapted to determine a need to adjust a relative phase difference of each of said signals and to deliver instructions to a phase shifter to adjust phase as needed;
- and
- a plurality of antennae with each antenna coupled to a power amplifier, said power amplifier adapted to transmit a single one of said signals in a non-diversity mode when said power combiner/divider adjusts the power level of each signal so as to provide full power to said single one of said signals and no power to other of said plurality of said signals and continuing to transmit said single one of said signals in the non-diversity mode after said device receives a discernable indicator that said single one of said signals was received, and said power amplifier adapted to transmit said plurality of said signals in a transmit diversity mode when said power combiner/divider adjusts the power level of each of said signals so as to provide power to each of said signals with said phase shifter receiving instruction from said processor to adjust the relative phase when said device receives a subsequent non-discernable indicator or receives no indicator in response to said transmission of said single one of said signals.
Dependencies are inferred from the claim text.