IQ imbalance image compensation in multi-carrier wireless communication systems
First Claim
Patent Images
1. A method in a wireless communication terminal, the method comprising:
- receiving, at the terminal, an Orthogonal Frequency-Division Multiplexing (“
OFDM”
) symbol carrying an aggregated carrier including a first component carrier and a second component carrier, wherein the OFDM symbol includes a reference signal (“
RS”
), and wherein the first component carrier includes at least a first subcarrier carrying a first symbol of the reference signal and the second component carrier includes at least a second subcarrier carrying a second symbol of the reference signal;
measuring a leakage characteristic from either the first subcarrier onto the second subcarrier or from the second subcarrier onto the first subcarrier based on the first symbol of the reference signal carried by the first subcarrier and the second symbol of the reference signal carried by the second subcarrier;
receiving a signal on the aggregated carrier; and
compensating for leakage of the signal from either the first component carrier to the second component carrier or from the second component carrier to the first component carrier based on the measurement of the leakage characteristic.
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Accused Products
Abstract
A method in a wireless communication terminal includes receiving an aggregated carrier including a first component carrier and a second component carrier, determining a level of interference from a signal received on the first component carrier to a signal on the second component carrier based on a signal characteristic of the first component carrier and a signal characteristic of the second component carrier, and providing signal interference information to a serving base station if the determined interference level satisfies a condition.
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Citations
14 Claims
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1. A method in a wireless communication terminal, the method comprising:
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receiving, at the terminal, an Orthogonal Frequency-Division Multiplexing (“
OFDM”
) symbol carrying an aggregated carrier including a first component carrier and a second component carrier, wherein the OFDM symbol includes a reference signal (“
RS”
), and wherein the first component carrier includes at least a first subcarrier carrying a first symbol of the reference signal and the second component carrier includes at least a second subcarrier carrying a second symbol of the reference signal;measuring a leakage characteristic from either the first subcarrier onto the second subcarrier or from the second subcarrier onto the first subcarrier based on the first symbol of the reference signal carried by the first subcarrier and the second symbol of the reference signal carried by the second subcarrier; receiving a signal on the aggregated carrier; and compensating for leakage of the signal from either the first component carrier to the second component carrier or from the second component carrier to the first component carrier based on the measurement of the leakage characteristic. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method in a base station configured to transmit an aggregated signal that includes at least two component carriers, the method comprising:
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transmitting scheduling information indicating when a reference signal will be transmitted on a first component carrier, wherein the scheduling information includes at least one time slot on the first component carrier where the reference signal can be transmitted; transmitting the reference signal on the first component carrier on least one of the indicated time slots; blanking a data signal transmission on a second component carrier on a time slot that at least partially overlaps in time with the time slot where the reference signal is transmitted on the first component carrier; and receiving a message from a wireless terminal being served by the base station indicating that interference from the reference signal received on the first component carrier to the blanked data signal transmission received on the second component carrier, based on a measured leakage characteristic from the first component carrier onto the second component carrier, exceeds a certain level. - View Dependent Claims (11, 12, 13, 14)
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Specification