Telecommunications – Transmitter and receiver at separate stations
Patent
1988-06-02
1991-03-05
Eisenzopf, Reinhard J.
Telecommunications
Transmitter and receiver at separate stations
455296, H04B 110
Patent
active
049982893
ABSTRACT:
An interference detecting circuit is used in a cellular radiotelephone communication system which employs angular modulated frequencies in order to determine when to change the communication process so as to maintain the integrity of the communication path. For example, when the circuit detects an excessive amount of multipath or co-channel interference on a channel serving an active call, the system may decrease the effective data bit rate. The circuit includes a logarithmic envelope detector for receiving a channel's angular modulated signal and for providing a log envelope output signal, a high pass filter for removing a particular range of undesired frequencies from the log envelope output signal, and a level detector for indicating the level of filtered output signal. The output of the level detector represents the amount of interference on the angular modulated frequency signal. A microcomputer analyzes the amount of interference to determine when such communication process changes are desired.
REFERENCES:
patent: 4085370 (1978-04-01), van der Poel et al.
patent: 4268722 (1981-05-01), Little et al.
patent: 4531235 (1985-07-01), Brusen
patent: 4561114 (1985-12-01), Kozono et al.
patent: 4564821 (1986-01-01), Reichart
patent: 4633463 (1986-12-01), Mack
patent: 4648126 (1987-03-01), Toffolo
patent: 4654867 (1987-03-01), Labedz et al.
patent: 4726073 (1988-02-01), Sessink
patent: 4748625 (1988-05-01), Krause et al.
patent: 4882768 (1989-11-01), Obana et al.
"Co-Channel Interference Measurement Method for Mobile Communication", by Shigeru Kozono, IEEE Transactions on Vehicular Tech., vol. VT-36, No. 1, 2-87.
"Signal Integrity Control Technique for an RF Communication System", assigned to the assigned filed on the same day of this application.
Application IC Handbook Plessey Semiconductor, May 1982, pp. 31-39 Reference No. PSI1828.
"Operational Amplifier Characteristics & Applications", Robert G. Irvine, Prentice Hall, 1981, pp. 175 and 197.
"Statistical Properties of a Sine Wave Plus Random Noise", by S. O. Rice, Bell System Technical Journal, vol. 27, Jan. 1948, pp. 109-157.
Mitzlaff James E.
Rabe Duane C.
Eisenzopf Reinhard J.
Motorola Inc.
Motsinger F. John
Urban Edward
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