System and method for adaptive DC offset compensation in wireless transmissions
First Claim
1. A method comprising:
- determining, during a first expected idle period of a received signal, a first direct current (DC) component of a first amplified representation of the received signal at an output of an amplifier, wherein the amplifier is set to a first gain setting;
determining, during a second expected idle period of the received signal, a second DC component of a second amplified representation of the received signal at the output of the amplifier, wherein the amplifier is set to the first gain setting;
determining whether a transmission burst preceding the second idle period is a valid transmission burst;
when the transmission burst is determined as valid;
determining a first average DC component based at least in part on the first and second DC components; and
adjusting a DC offset used by the amplifier when set to the first gain setting based on a comparison of the first average DC component to one or more threshold values; and
when the transmission burst is determined as invalid;
determining a second average DC component based at least in part on the first DC component but not the second DC component; and
adjusting the DC offset used by the amplifier when set to the first gain setting based on a comparison of the second average DC component to one or more threshold values.
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Accused Products
Abstract
A first direct current (DC) component of a first amplified representation of a received signal at an output of an amplifier set to a first gain setting is determined during a first expected idle period of a received signal. A second DC component of a second amplified representation of the received signal at the output of the amplifier set to the first gain setting is determined during a second expected idle period of the received signal. A first average DC component is determined based at least in part on the first and second DC components and a DC offset used by the amplifier when set to the first gain setting is adjusted based on a comparison of the first average DC component to one or more threshold values.
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Citations
16 Claims
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1. A method comprising:
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determining, during a first expected idle period of a received signal, a first direct current (DC) component of a first amplified representation of the received signal at an output of an amplifier, wherein the amplifier is set to a first gain setting; determining, during a second expected idle period of the received signal, a second DC component of a second amplified representation of the received signal at the output of the amplifier, wherein the amplifier is set to the first gain setting; determining whether a transmission burst preceding the second idle period is a valid transmission burst; when the transmission burst is determined as valid; determining a first average DC component based at least in part on the first and second DC components; and adjusting a DC offset used by the amplifier when set to the first gain setting based on a comparison of the first average DC component to one or more threshold values; and when the transmission burst is determined as invalid; determining a second average DC component based at least in part on the first DC component but not the second DC component; and adjusting the DC offset used by the amplifier when set to the first gain setting based on a comparison of the second average DC component to one or more threshold values. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A system comprising:
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a variable gain amplifier having a first input to receive a first signal, a second input to receive a DC offset and an output to provide a second signal, the second signal including an amplified representation of the first signal having an adjustment based on the DC offset; a first table having an entry for each of a set of gain settings of the amplifier, each entry to store a value representative of a DC offset provided to the second input of the amplifier when the amplifier is set to the corresponding gain setting; and an offset adjustment module operably coupled to the second input and the output of the amplifier and to the first table, wherein the offset adjustment module is operable to, for each of one or more gain settings; determine an average DC component of the second signal for the gain setting by; determining, during a first period of the second signal, a first DC component, wherein the amplifier is set to the first gain setting; determining whether a first transmission burst during the second period is a valid transmission burst; in response to determining the first transmission burst as valid; determining, during a second period of the received signal, a second DC component, wherein the amplifier is set to the first gain setting; and determining the average DC component based at least in part on the first and second DC components; and in response to determining the first transmission burst as invalid; determining the average DC component exclusive of the second DC component; and adjusting the value representative of a DC offset stored in the entry of the first table corresponding to the gain setting based on a comparison of the average DC component to one or more thresholds. - View Dependent Claims (8, 9, 10, 11, 12, 13)
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14. A method comprising:
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determining a first average direct current (DC) component for an amplified representation of a first signal, the first average DC component based on a measured DC component for the amplified representation of the first signal obtained during one or more periods of the first signal; determining whether a first measured DC component is valid based on a validity of a transmission burst that precedes a period during which the first measured DC component is determined; when the first measured DC component is determined to be valid; adjusting a DC offset supplied to an amplifier used to provide the amplified representation of the first signal based on a comparison of the first average DC component to one or more thresholds; and when the first measured DC component is determined to be invalid; determining a second average DC component exclusive of the first measured DC component; and adjusting a DC offset supplied to an amplifier used to provide the amplified representation of the first signal based on a comparison of the second average DC component to one or more thresholds. - View Dependent Claims (15, 16)
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Specification