Power control with space time transmit diversity
First Claim
Patent Images
1. A circuit, comprising:
- a measurement circuit coupled to receive a first wideband code division multiple access signal, comprising at least one pilot, from a first antenna of a remote transmitter and coupled to receive a second wideband code division multiple access signal, comprising at least one pilot, from a second antenna of the remote transmitter, each of the first and second wideband code division multiple access signals being transmitted at a first time, the measurement circuit producing a first output signal corresponding to a magnitude of the first wideband code division multiple access signal and a second output signal corresponding to a magnitude of the second wideband code division multiple access signal; and
a control circuit coupled to receive the output signal and a reference signal, the control circuit arranged to produce a first transmit power control signal and a second transmit power control signal at a second time in response to a comparison of the output signal and the reference signal, each of the first and second transmit power control signals set to control transmit power of respective said first and second antennas.
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Abstract
A circuit is designed with a measurement circuit (432). The measurement circuit is coupled to receive a first input signal (903) from a first antenna (128) of a transmitter and coupled to receive a second input signal (913) from a second antenna (130) of the transmitter. Each of the first and second signals is transmitted at a first time. The measurement circuit produces an output signal corresponding to a magnitude of the first and second signals. A control circuit (430) is coupled to receive the output signal and a reference signal. The control circuit is arranged to produce a control signal at a second time in response to a comparison of the output signal and the reference signal.
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Citations
51 Claims
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1. A circuit, comprising:
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a measurement circuit coupled to receive a first wideband code division multiple access signal, comprising at least one pilot, from a first antenna of a remote transmitter and coupled to receive a second wideband code division multiple access signal, comprising at least one pilot, from a second antenna of the remote transmitter, each of the first and second wideband code division multiple access signals being transmitted at a first time, the measurement circuit producing a first output signal corresponding to a magnitude of the first wideband code division multiple access signal and a second output signal corresponding to a magnitude of the second wideband code division multiple access signal; and a control circuit coupled to receive the output signal and a reference signal, the control circuit arranged to produce a first transmit power control signal and a second transmit power control signal at a second time in response to a comparison of the output signal and the reference signal, each of the first and second transmit power control signals set to control transmit power of respective said first and second antennas. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A circuit, comprising:
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a measurement circuit coupled to receive a first input signal from a first antenna of a transmitter at a first time and coupled to receive a second input signal from a second antenna of the transmitter at a third time, the measurement circuit producing a first output signal corresponding to a magnitude of the first input signal and producing a second output signal corresponding to a magnitude of the second input signal; and a control circuit coupled to receive the first and second output signals and a reference signal, the control circuit arranged to produce a first control signal at a second time after the first time in response to a comparison of the first output signal and the reference signal, the control circuit arranged to produce a second control signal at a fourth time after the third time in response to a comparison of the second output signal and the reference signal. - View Dependent Claims (13, 14, 15, 16)
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17. A method of processing signals for a communication system, comprising the steps of:
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receiving at least one control signal, comprising at least one transmit power control signal, transmitted from an external source at a first time; producing a transmit power level corresponding to at least one of a plurality of antennas in response to the control signal; and transmitting a plurality of signals to the external source at a respective said transmit power level at a second time from a respective said plurality of antennas, wherein the at least one transmit power control signal includes a plurality of transmit power control signals, and wherein the respective said transmit power level for each of said plurality of antennas is set by a respective transmit power control signal of the plurality of transmit power control signal. - View Dependent Claims (18)
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19. A method of processing signals, comprising the steps of:
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selecting a diversity pattern having plural elements corresponding to plural signal sources and plural times; selecting a symbol pattern having a plurality of symbols corresponding to plural signal sources and plural times; producing an overlay of each element of the diversity pattern with the symbol pattern. - View Dependent Claims (20, 21, 22, 23, 24, 25, 26)
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27. A method of processing signals, comprising the steps of:
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receiving an overlay pattern of transmitted symbols from plural signal sources at plural times; decoding the overlay pattern according to a diversity pattern having plural elements corresponding to plural signal sources and plural times; and decoding the overlay pattern according to a symbol pattern having a plurality of symbols corresponding to plural signal sources and plural times, the symbol pattern corresponding to each of plural elements of the diversity pattern. - View Dependent Claims (28, 29, 30, 31, 32, 33, 34, 35)
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36. A transceiver circuit, comprising:
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a measurement circuit coupled to receive a first input signal from a first antenna of a transmitter remote from the transceiver and coupled to receive a second input signal from a second antenna of the transmitter, each of the first and second input signals being transmitted at a first time, the measurement circuit producing an output signal in response to the first and second input signals; and a control circuit coupled to receive the output signal and a reference signal, the control circuit arranged to produce a first power control signal and a second power control signal to control transmit power from the first and second transmit antennas. - View Dependent Claims (37, 38, 39, 40, 41, 42, 43, 44)
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45. A method of processing signals for a transceiver, comprising the steps of:
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receiving a first input signal transmitted from a first antenna of a transmitter remote from the transceiver at a first time; receiving a second input signal transmitted from a second antenna of the transmitter at the first time; measuring each of the first and second input signals and producing at least one output signal; comparing the at least one output signal to a reference signal; and producing a first power control signal and a second power control signal to control transmit power from the first and second transmit antennas in response to the step of comparing. - View Dependent Claims (46, 47, 48, 49, 50, 51)
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Specification