Method and apparatus for reduced interference signal demodulation
AssigneeTelefonaktiebolaget LM Ericsson (publ)
InventorAli S. Khayrallah
Life of this patent
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Abstract
A method and apparatus carry out received signal processing for received communication signals based on least squares processing to estimate the contribution of one or more interferer signals. The exemplary receiver uses interferer signal channel estimates to obtain least squares estimates for the interference contributions of one or more interferer signals, and then uses those estimates to suppress interference during demodulation processing. Further, the least-squares estimates may be used to obtain a reduced search space wherein the candidate set of signals searched during demodulation processing is reduced.
Claims39
A method of suppressing interference in a received signal that includes a desired signal, the method comprising:
- generating a set of desired signal hypotheses based on performing spherical detection within a transmit signal space corresponding to the desired signal;
- estimating one or more interference components via least squares estimations based on interferer signal channel estimates by estimating an interference component of the received signal for each one in the set of desired signal hypotheses;
- and
- demodulating the received signal to recover the desired signal based at least in part on the interference components.
A method of suppressing interference in a received signal that includes a desired signal, the method comprising:
- generating a first residual between the received signal and each candidate signal in a set of candidate signals, wherein each candidate signal is postulated as the desired signal;
- calculating an interference component for each first residual as a least squares estimate;
- generating a second residual from each first residual by removing the corresponding interference component;
- and
- determining a best candidate signal by evaluating the second residuals based on identifying a smallest second residual and selecting the corresponding candidate signal as a best candidate for the desired signal.
A receiver circuit for suppressing interference in a received signal that includes a desired signal, the circuit comprising one or more processing circuits configured to:
- generate a first residual between the received signal and each candidate signal in a set of candidate signals, wherein each candidate signal is postulated as the desired signal;
- calculate an interference component for each first residual as a least squares estimate;
- generate a second residual from each first residual by removing the corresponding interference component;
- and
- determine a best candidate signal by evaluating the second residuals based on identifying a smallest second residual and selecting the corresponding candidate signal as a best candidate for the desired signal.
A method of suppressing interference in a received signal that includes a desired signal, the method comprising:
- generating a first residual between the received signal and each candidate signal in a set of candidate signals, wherein each candidate signal is postulated as the desired signal;
- calculating an interference component for each first residual as a least squares estimate;
- generating a second residual from each first residual by removing the corresponding interference component;
- and
- determining a best candidate signal by evaluating the second residuals by:
- identifying a smallest one of the second residuals;
- determining whether the corresponding interference component is rational and, if so, selecting the candidate signal associated with the smallest second residual as a best candidate for the desired signal.
A method of suppressing interference in a received signal that includes a desired signal, the method comprising:
- generating a first residual between the received signal and each candidate signal in a set of candidate signals, wherein each candidate signal is postulated as the desired signal;
- calculating an interference component for each first residual as a least squares estimate;
- generating a second residual from each first residual by removing the corresponding interference component;
- and
- determining a best candidate signal by evaluating the second residuals by:
- identifying a smallest one of the second residuals;
- bounding the corresponding interference component as needed according to one or more interferer signal characteristics;
- and
- selecting the candidate signal associated with the smallest second residual as a best candidate for the desired signal.
A method of suppressing interference in a received signal that includes a desired signal, the method comprising:
- generating a first residual between the received signal and each candidate signal in a set of candidate signals, wherein each candidate signal is postulated as the desired signal;
- calculating an interference component for each first residual as a least squares estimate;
- generating a second residual from each first residual by removing the corresponding interference component;
- and
- determining a best candidate signal by evaluating the second residuals by:
- determining whether the interference component associated with a smallest one of the second residuals is a valid estimate by determining whether it comports with known or presumed transmit signal characteristics;
- if the interference component is not a valid estimate, identifying a smallest first residual and selecting the corresponding candidate signal as a best candidate for the desired signal;
- and
- if the interference component is a valid estimate, selecting the candidate signal corresponding to the smallest second residual as a best candidate for the desired signal.
A receiver circuit for suppressing interference in a received signal that includes a desired signal, the circuit comprising one or more processing circuits configured to:
- generate a first residual between the received signal and each candidate signal in a set of candidate signals, wherein each candidate signal is postulated as the desired signal;
- calculate an interference component for each first residual as a least squares estimate;
- generate a second residual from each first residual by removing the corresponding interference component;
- and
- determine a best candidate signal by evaluating the second residuals based on identifying a smallest one of the second residuals, determining whether the corresponding interference component is rational and, if so, selecting the candidate signal associated with the smallest second residual as a best candidate for the desired signal.
A receiver circuit for suppressing interference in a received signal that includes a desired signal, the circuit comprising one or more processing circuits configured to:
- generate a first residual between the received signal and each candidate signal in a set of candidate signals, wherein each candidate signal is postulated as the desired signal;
- calculate an interference component for each first residual as a least squares estimate;
- generate a second residual from each first residual by removing the corresponding interference component;
- and
- determine a best candidate signal by evaluating the second residuals based on identifying a smallest one of the second residuals, bounding the corresponding interference component as needed according to one or more interferer signal characteristics, and selecting the candidate signal associated with the smallest second residual as a best candidate for the desired signal.
A receiver circuit for suppressing interference in a received signal that includes a desired signal, the circuit comprising one or more processing circuits configured to:
- generate a first residual between the received signal and each candidate signal in a set of candidate signals, wherein each candidate signal is postulated as the desired signal;
- calculate an interference component for each first residual as a least squares estimate;
- generate a second residual from each first residual by removing the corresponding interference component;
- and
- determine a best candidate signal by evaluating the second residuals based on:
- determining whether the interference component associated with a smallest one of the second residuals is a valid estimate by determining whether it comports with known or presumed transmit signal characteristics;
- if the interference component is not a valid estimate, identifying a smallest first residual and selecting the corresponding candidate signal as a best candidate for the desired signal;
- and
- if the interference component is a valid estimate, selecting the candidate signal corresponding to the smallest second residual as a best candidate for the desired signal.
Dependencies are inferred from the claim text.