METHOD AND APPARATUS FOR ADAPTIVE CONTROL OF TRANSMIT DIVERSITY TO PROVIDE OPERATING POWER REDUCTION
First Claim
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1. A method of transmitting a signal by a mobile wireless communication device, comprising:
- receiving an input signal for transmission;
determining whether to transmit the input signal in diversity or non-diversity mode;
if the determination is to transmit the signal in diversity mode, then;
producing first and second transmit signals, said first and second transmit signals differing by a transmit diversity parameter;
simultaneously transmitting the first and second transmit signals using first and second transmit paths, respectively; and
if the determination is to transmit the signal in non-diversity mode, then;
transmitting the input signal using only a selected one of said first and second transmit paths.
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Abstract
A method and apparatus for selectively enabling or disabling transmit diversity in a mobile communication device. The mobile communication device may switch between diversity and non-diversity operation based on various transmit power considerations.
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Citations
34 Claims
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1. A method of transmitting a signal by a mobile wireless communication device, comprising:
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receiving an input signal for transmission; determining whether to transmit the input signal in diversity or non-diversity mode; if the determination is to transmit the signal in diversity mode, then; producing first and second transmit signals, said first and second transmit signals differing by a transmit diversity parameter; simultaneously transmitting the first and second transmit signals using first and second transmit paths, respectively; and if the determination is to transmit the signal in non-diversity mode, then; transmitting the input signal using only a selected one of said first and second transmit paths. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. A mobile communication device comprising:
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a phase modulator to receive a signal and produce first and second transmit signals differing by a transmit diversity parameter; a first transmit path including at least a first antenna, and a first power amplifier operable to amplify a transmit signal for transmission by the first antenna; a second transmit path including at least a second antenna, and a second power amplifier operable to amplify a transmit signal for transmission by the second antenna; a processor to determine whether to transmit the input signal in diversity or non-diversity mode, wherein if the processor determines to transmit the signal in diversity mode, then said processor is to enable first and second power amplifiers and control said phase modulator to simultaneously transmit the first and second transmit signals using said first and second transmit paths, respectively, and wherein if the processor determines to transmit the signal in non-diversity mode, then said processor is to transmit the input signal using only a selected one of said first and second transmit paths. - View Dependent Claims (19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34)
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Specification