Systems and methods for wireless network discovery and synchronization using spatial whiteners, matched filters, and adaptive beamformers to identify reference signal waveforms
Physical layer processing methods for network acquisition by remote nodes in wireless communication systems are described herein. New methods for wireless network discovery and synchronization by remote nodes are described herein that utilize spatial (e.g., antenna array) processing algorithms which may achieve enhanced functioning in challenging radio frequency environments, such as those containing interference and multipath distortion effects. These methods may include advantageous use of spatial whiteners and associated pluralities of adaptive beamformers to detect network reference and synchronization signals and estimate their parameters.
1. A receiver comprising:
a plurality of adaptive beamformers, each of the adaptive beamformers configured to:
generate a respective training sequence using a respective signal parameter;
generate a set of beamforming weights for the respective training sequence; and
generate a detection statistic from the set of beamforming weights; and
a selector configured to evaluate a function using the detection statistic and to select the respective training sequence and associated parameter value based on an output of the function meeting a criterion.
2. The receiver of claim 1 , wherein the respective signal parameter corresponds to a frequency offset, a timing offset, a symbol sequence, or combinations thereof.
3. The receiver of claim 1 , wherein the respective signal parameter corresponds to a deterministic waveform, a symbol sequence, or combinations thereof.
4. The receiver of claim 1 , wherein the respective signal parameter corresponds to a network configuration parameter.
5. The receiver of claim 4 , wherein the network configuration parameter comprises an identification number, a pilot code group number, a pilot code cyclic shift, or combinations thereof.
6. The receiver of claim 1 , wherein the function corresponds to a statistical function associated with a parameter of the plurality of training sequences, and wherein the criterion corresponds to a maximum of the statistical function or votes of a voting vector based on numerical ordering of the statistical function.
7. A method comprising:
generating, using an adaptive beamformer of a plurality of adaptive beamformers, a respective training sequence using a respective signal parameter;
generating, using the adaptive beamformer, a set of beamforming weights for the respective training sequence;
generating, using the adaptive beamformer, a detection statistic from the set of beamforming weights;
evaluating, using a selector, a function using the detection statistic; and
selecting, using the selector, the respective training sequence and associated parameter value based on an output of the function meeting a criterion.
8. The method of claim 7 , wherein the respective signal parameter generated using the adaptive beamformer corresponds to a signal nuisance parameter.
9. The method of claim 7 , wherein the respective signal parameter corresponding to a signal nuisance parameter generated using the adaptive beamformer comprises a timing offset, a symbol sequence, a deterministic waveform, a symbol sequence, or combinations thereof.
10. The method of claim 7 , wherein the respective signal parameter generated using the adaptive beamformer corresponds to a network configuration parameter, the network configuration parameter comprising an identification number, a pilot code group number, a pilot code cyclic shift, or combinations thereof.
11. The method of claim 7 , wherein the function evaluated by the selector corresponds to a statistical function associated with a parameter of the plurality of training sequences, and wherein the criterion corresponds to a maximum of the statistical function or votes of a voting vector based on numerical ordering of the statistical function.