Telecommunications – Radiotelephone system
Patent
1992-05-26
1998-04-14
Cumming, William
Telecommunications
Radiotelephone system
455138, 342432, H04Q 720
Patent
active
057405301
ABSTRACT:
There is provided a method of rapid Received Signal Strength Indication (RSSI) of a time-dispersed signal having echoes (where the time dispersal represents a significant fraction or more of the transmitted symbol interval). It comprises a sliding correlation of a received signal against a known sequence or via channel sounding to obtain the time-dispersal function of the communications channel upon which the signal is transmitted and a summation of the squares of the quadrature components of the energies at relative maxima of the correlations (correlation peaks determined with reference to a threshold level) to integrate the energy defined by the correlation function to determine the energy present among the time-dispersed echoes utilizing the time-dispersal function. Thus, the energy present in the time-dispersed echoes is related to the received signal strength, the RSSI comprises a scalar of the energy present and the scalar comprises a function of the receiver's gain, RSSI determinations during any given interval are less dependent upon the ambulatory velocity of the receiver, and RSSI determinations of equivalent accuracy are obtained more rapidly or more accurate RSSI determinations are obtained per unit time.
REFERENCES:
patent: 3766477 (1973-10-01), Cook
patent: 3815028 (1974-06-01), Rabow
patent: 4718081 (1988-01-01), Brenig
patent: 4881028 (1989-11-01), Graziano
patent: 4893347 (1990-01-01), Eastmond et al.
patent: 4918437 (1990-04-01), Jasinski et al.
patent: 5115514 (1992-05-01), Leslie
Peebles, "Probability Random, Variables, and Random Signal Principles" 1980 McGraw-HIll Book Corp. pp. 132-139.
Taub, Schilling "Principles of Communication Systems" 1986 McGraw-Hill Book Company, pp. 411-419, 422-427, 436-437.
Proakis, Manolakis "Introduction to Digital Signal Processing" 1988 Macmillian Publishing Company, pp. 41-45, 125-129.
Activities of the COST 207 Working Group on Propagation, R. W. Lorenz--Forschungsinstitut der Deutschen Bundespost, Postfach 5000, D-6100 Darmstadt, Federal Republic of Germany.
Labedz Gerald Paul
Rabe Duane C.
Cumming William
Motorola Inc.
Motsinger John F.
Sonnentag Richard A.
LandOfFree
Rapid received signal strength indication does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Rapid received signal strength indication, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Rapid received signal strength indication will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-649070