Abstract: A method for locating the source of a passive intermodulation (PIM) fault in a radio frequency (RF) system, the method comprising: a) generating a PIM fault fingerprint database by: modelling an RF network; defining a plurality of PIM fault patterns for the modelled RF network by defining PIM faults at one or more sources; simulating a received RF signal for each respective PIM fault pattern; generating the PIM fault fingerprint database in dependence on the simulated received RF signals for each defined PIM fault pattern; b) measuring an RF signal for a real network having a PIM fault and abstracting the measured RF signal to define a given signal; c) searching and matching the given signal using the fingerprint database to determine the PIM fault pattern; and d) locating the source of the PIM fault, or giving a further measuring guideline in dependence on the determined PIM fault pattern.

Abstract: A method for predicting outdoor three-dimensional space signal field strength by extended COST-231-Walfisch-Ikegami propagation model, comprising: establishing a three-dimensional scene model between a transmitting base station and a predicted region space; performing an on-site measurement according to a certain resolution in a prediction region and recording wireless signal strength information at a height of 1 m above the ground; acquiring a vertical cross section between the transmitting base station and a receiving point at a height of 1 m above the ground, and acquiring therefrom an average roof height, an average street width and an average between-building space; predicting a reception signal strength at a measurement point in a calculation formula of a COST-231-Walfishch-Ikegami propagation model; correcting the COST-231-Walfishch-Ikegami propagation model of the measurement point according to an error ? between measured data and a prediction result; acquiring a vertical cross section between the tra

Abstract: The present invention relates to a method for predicting indoor three-dimensional space signal field strength by an outdoor-to-indoor propagation model, which comprises the steps of: establishing a three-dimensional space scene model from a transmitting base station to a target building; predicting space field strength of an outer envelope of the target building according to an extended COST-231-Walfisch-Ikegami propagation model; generating, on the outer envelope of the target building, a series of out-door-to-indoor virtual rays in accordance with a certain resolution; simulating a propagation procedure of the virtual rays using a ray tracing propagation model algorithm, to predict three-dimensional space signal field strength in the target building.

Abstract: A method for predicting outdoor three-dimensional space signal field strength by extended COST-231-Walfisch-Ikegami propagation model, comprising: establishing a three-dimensional scene model between a transmitting base station and a predicted region space; performing an on-site measurement according to a certain resolution in a prediction region and recording wireless signal strength information at a height of 1 m above the ground; acquiring a vertical cross section between the transmitting base station and a receiving point at a height of 1 m above the ground, and acquiring therefrom an average roof height, an average street width and an average between-building space; predicting a reception signal strength at a measurement point in a calculation formula of a COST-231-Walfishch-Ikegami propagation model; correcting the COST-231-Walfishch-Ikegami propagation model of the measurement point according to an error ? between measured data and a prediction result; acquiring a vertical cross section between the tra

Abstract: The present invention relates to a method for predicting indoor three-dimensional space signal field strength by an outdoor-to-indoor propagation model, which comprises the steps of: establishing a three-dimensional space scene model from a transmitting base station to a target building; predicting space field strength of an outer envelope of the target building according to an extended COST-231-Walfisch-Ikegami propagation model; generating, on the outer envelope of the target building, a series of out-door-to-indoor virtual rays in accordance with a certain resolution; simulating a propagation procedure of the virtual rays using a ray tracing propagation model algorithm, to predict three-dimensional space signal field strength in the target building.