H - Electricity – 04 – B
Patent
H - Electricity
04
B
325/71
H04B 17/00 (2006.01) H04B 1/16 (2006.01) H04B 7/26 (2006.01)
Patent
CA 1309143
APPARATUS AND METHOD FOR HIGH-SPEED DETERMINATION OF RECEIVED RF SIGNAL STRENGTH INDICATOR ABSTRACT OF THE DISCLOSURE Rapid measurement of the received signal strength indicator (RSSI) of a radio frequency signal is performed by sampling received signal amplitudes and averaging only selected ones of the sampled amplitudes. In one embodiment, two sample values obtained successively in time are compared and the larger of the two is stored, this process continuing over a desired sampling interval. Sampled values which exceed both the value obtained from an immediately preceding sample time and the value obtained from an immediately succeeding sample time are stored twice, while sample values which are less than immediately preceding and succeeding sample values are never stored. The stored values are averaged to yield an indication of average received signal amplitude. The resulting average value is very close to true average signal amplitude, is substantially unaffected by Rayleigh fading phenomenon, and yet is sensitive to rapid changes in received signal amplitude caused, for example, by obstacles in the signal transmission path.
548442
Company General Electric
Craig Wilson And Company
Perry Fred G.
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