| US 7,489,905 B2 | ||
| System for determining RF path loss between an RF source and an RF receiver with hysteresis and related methods | ||
| Yihong Qi, St. Agatha (Canada); Perry Jarmuszewski, Waterloo (Canada); and Michael Certain, Kitchener (Canada) | ||
| Assigned to Research In Motion Limited, Waterloo, Ontario (Canada) | ||
| Filed on Mar. 01, 2006, as Appl. No. 11/364,998. | ||
| Prior Publication US 2007/0207758 A1, Sep. 06, 2007 | ||
| Int. Cl. H04B 17/00 (2006.01) | ||
| U.S. Cl. 455—67.11 [455/67.12; 455/67.13; 455/67.7; 455/115.1; 375/224; 370/224] | 24 Claims |
| 1. A test method for determining radio frequency (RF) path loss between an RF source and an RF receiver for a given RF channel
in a given RF frequency band, the RF source transmitting RF power values at a relatively fine granularity, the RF receiver
generating received signal strength indicator (RSSI) values at a relatively coarse granularity and having an unknown hysteresis
about each transition between adjacent RSSI values, the test method comprising:
determining a pair of hysteresis edges about a given RSSI value transition at the RF receiver by sweeping RF power values
transmitted from the RF source in increasing and decreasing directions;
determining a relationship between the relatively fine granularity RF power values and the relative coarse granularity RSSI
values using the hysteresis transition edges; and
determining the RF path loss for the given channel based upon a given RSSI at a given RF power value and the relationship
between the relatively fine granularity RF power values and the relative coarse granularity RSSI values.
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