Systems, computer program products, and methods using carrier phases to detect multipath signals
AssigneeQUALCOMM Incorporated
InventorsDominic Gerard Farmer, Jie Wu, Emilija M. Simic
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Abstract
A multipath detector includes an RF module receiving multiple signals, and a correlator module receiving the signals from the RF module. The correlator module correlates the signals to create a composite ACF, and produces samples of the composite autocorrelation function (ACF). The samples are time delayed relative to each other. The multipath detector also includes a carrier phase processor that receives the samples and estimates carrier phases associated with each of the samples. The carrier phase processor employs the estimated carrier phases to determine if one of the signals is subject to a multipath delay.
Claims30
A multipath detector comprising:
- an RF module that receives a plurality of signals;
- a correlator module that receives the signals from the RF module, correlates the signals to create a composite autocorrelation function (ACF), and produces a plurality of samples of the composite ACF, the samples being time delayed relative to each other;
- and
- a carrier phase processor that receives the samples and estimates carrier phases associated with each of the samples, the carrier phase processor identifying whether one of the received signals is subject to a multipath delay based upon the estimated carrier phases.
A method for multipath detection comprising:
- correlating a plurality of received signals and outputting samples corresponding to a composite autocorrelation function (ACF), the samples representing values of the composite ACF at a plurality of time offsets;
- producing carrier phase observables by estimating carrier signal phases associated with each of the samples;
- and
- using the carrier phase observables to identify a multipath signal in the received signals.
A system comprising:
- means for receiving a plurality of signals delayed relative to each other;
- means for performing autocorrelation on the received signals and producing a plurality of samples of a composite autocorrelation function (ACF);
- means for generating carrier phase information for the samples;
- and
- means for identifying a multipath signal using the carrier phase information.
A computer readable medium encoded with instructions, when executed by a processing unit, implement multipath detection, the instructions comprising:
- code that correlates received signals;
- code that samples a composite autocorrelation function (ACF) based on the correlated signals;
- code that generates carrier phase observables for the samples, each carrier phase observable indicating a carrier signal phase associated with its respective sample;
- and
- code that detects a multipath signal based upon the carrier phase observables.
Dependencies are inferred from the claim text.