Patent ID: 7509095

Claim:
A method for identifying occurrence of shadowing phenomenon to be implemented using a wireless communications system that includes a signal-transmitting device and a signal-receiving device, the signal-receiving device periodically executing a synchronization process to evaluate quality of wireless communications conducted through a signal transmission path between the signal-transmitting device and the signal-receiving device, a set of signal-state estimated values that includes at least a phase parameter and a power parameter being generated during each synchronization process, said method comprising the steps of: a) collecting the phase parameters for a number of the synchronization processes; b) generating a set of Poincaré coordinate data from the phase parameters collected in step a); c) analyzing distribution of the set of Poincaré coordinate data generated in step b) on a Poincaré map; and d) determining that the signal transmission path is experiencing a shadowing phenomenon when the set of Poincaré coordinate data generated in step b) has a non-elliptical distribution on the Poincaré map, and that the signal transmission path is not experiencing the shadowing phenomenon when the set of Poincaré coordinate data generated in step b) has an elliptical distribution on the Poincaré map.