System and method for adaptive antenna impedance matching
First Claim
1. In a transceiver comprising a transmitter and a homodyne receiver, a method of characterizing an impedance mismatch between the transmitter and an associated antenna, the method comprising:
- configuring the homodyne receiver to receive and downconvert antenna-received signals to baseband signals during a first mode of transceiver operation and to receive and downconvert antenna-reflected signals to baseband signals during a second mode of transceiver operation; and
processing the baseband signals generated by the homodyne receiver in the first mode to obtain received signal data and processing the baseband signals generated by the homodyne receiver in the second mode to characterize an impedance mismatch between the transmitter and the associated antenna.
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Accused Products
Abstract
A transceiver includes a transmitter and a homodyne receiver, wherein the receiver is used to process both antenna-received and antenna-reflected signals. Thus, during a receive mode, for example, the receiver downconverts antenna-received signals to baseband signals, which are then processed to recover receive signal information. Then, during a transmit mode for example, antenna-reflected transmit signals are fed back to the receiver, which is retuned to the desired transmit frequency, and thus downconverts the reflected transmit signals to baseband signals. These baseband signals are then processed to obtain a characterization of impedance mismatch between the transceiver'"'"'s transmitter and the associated antenna. An adjustable matching network disposed in the transmit signal path thus may be adjusted based on the characterization to reduce the mismatch. Such configurations may be used with either single-band or multi-band embodiments of the transceiver, and the transceiver may be used in both TDMA and CDMA communication systems.
157 Citations
27 Claims
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1. In a transceiver comprising a transmitter and a homodyne receiver, a method of characterizing an impedance mismatch between the transmitter and an associated antenna, the method comprising:
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configuring the homodyne receiver to receive and downconvert antenna-received signals to baseband signals during a first mode of transceiver operation and to receive and downconvert antenna-reflected signals to baseband signals during a second mode of transceiver operation; and
processing the baseband signals generated by the homodyne receiver in the first mode to obtain received signal data and processing the baseband signals generated by the homodyne receiver in the second mode to characterize an impedance mismatch between the transmitter and the associated antenna. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A transceiver to transmit and receive signals from an associated antenna, the transceiver including:
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a homodyne receiver to generate a baseband signal by downconverting antenna-received signals in a first transceiver mode and by downconverting antenna-reflected signals in a second transceiver mode, said antenna-reflected signals being reflected transmit signals of the transceiver; and
a processing and control circuit to characterize an impedance mismatch between a transmitter portion of the transceiver and the associated antenna based on processing the baseband signal in the second transceiver mode. - View Dependent Claims (17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27)
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Specification