Methodology and system for generating a three-dimensional model of interference in a cellular wireless communication network
First Claim
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1. A method for characterizing interference in a cellular wireless network, the method comprising:
- sampling composite signals received at a plurality of ground-level locations that are within the intended coverage zone of the cellular wireless network, and recording the received composite signals as a first set of composite signals;
correlating each composite signal within said first set of composite signals with a predetermined waveform signal to identify a first set of correlation peaks therein;
generating data representing relative power level and time-of-arrival for each correlation peak within said first set of correlation peaks, and adding said data to a database;
sampling composite signals received at a plurality of above-ground-level locations that are within the intended coverage zone of the cellular wireless network, and recording the received composite signals as a second set of composite signals;
correlating each composite signal within said second set of composite signals with said predetermined waveform signal to identify a second set of correlation peaks therein; and
generating data representing relative power level and time-of-arrival for each correlation peak within said second set of correlation peaks, and adding said data to a database;
wherein time of arrival for each correlation peak within said first set of correlation peaks and time of arrival for each correlation peak within said second set of correlation peaks are derived from a plurality of synchronous time reference signals.
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Abstract
A method (and system) for quantifying a three-dimensional model of interference in a cellular wireless communication network. The model is derived from the acquisition and analysis of composite signals as part of a survey of ground-level locations and above-ground-level locations within the intended coverage zone of the cellular wireless communication network. Reliable identification and correlation of signal components are derived by analysis of the acquired composite signals that uses time-of-arrival of a known part of a signal (e.g., the FCCH burst used in GSM for frequency correction).
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Citations
27 Claims
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1. A method for characterizing interference in a cellular wireless network, the method comprising:
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sampling composite signals received at a plurality of ground-level locations that are within the intended coverage zone of the cellular wireless network, and recording the received composite signals as a first set of composite signals;
correlating each composite signal within said first set of composite signals with a predetermined waveform signal to identify a first set of correlation peaks therein;
generating data representing relative power level and time-of-arrival for each correlation peak within said first set of correlation peaks, and adding said data to a database;
sampling composite signals received at a plurality of above-ground-level locations that are within the intended coverage zone of the cellular wireless network, and recording the received composite signals as a second set of composite signals;
correlating each composite signal within said second set of composite signals with said predetermined waveform signal to identify a second set of correlation peaks therein; and
generating data representing relative power level and time-of-arrival for each correlation peak within said second set of correlation peaks, and adding said data to a database;
wherein time of arrival for each correlation peak within said first set of correlation peaks and time of arrival for each correlation peak within said second set of correlation peaks are derived from a plurality of synchronous time reference signals. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A system for characterizing interference in a cellular wireless network, the system comprising:
a data analysis processor that operates on a first set of composite signals and on a second set of composite signals, the first set of composite signals measured from a plurality of ground-level locations that are within the intended coverage zone of the cellular wireless network, and the second set of composite signals measured from a plurality of above-ground-level locations that are within the intended coverage zone of the cellular wireless network, the data analysis processor including means for correlating each composite signal within said first set of composite signals with a predetermined waveform signal to identify a first set of correlation peaks therein, means for generating data representing relative power level and time-of-arrival for each correlation peak within said first set of correlation peaks, and adding said data to a database, means for correlating each composite signal within said second set of composite signals with said predetermined waveform signal to identify a second set of correlation peaks therein, and means for generating data representing relative power level and time-of-arrival for each correlation peak within said second set of correlation peaks, and adding said data to a database, wherein time of arrival for each correlation peak within said first set of correlation peaks and time of arrival for each correlation peak within said second set of correlation peaks are derived from a plurality of synchronous time reference signals. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27)
Specification