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 by comparing a transmit power to a high threshold transmit power and a low threshold transmit power;
producing first and second transmit signals when the transmit power is greater than the high threshold, 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
transmitting the input signal using only a selected one of said first and second transmit paths when the transmit power is less than the low threshold.
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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.
95 Citations
30 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 by comparing a transmit power to a high threshold transmit power and a low threshold transmit power; producing first and second transmit signals when the transmit power is greater than the high threshold, 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 transmitting the input signal using only a selected one of said first and second transmit paths when the transmit power is less than the low threshold. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A mobile communication device comprising:
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a phase modulator adapted and configured 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 by comparing a transmit power to a high threshold power and a low threshold power; 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 (17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30)
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Specification