Telecommunications – Transmitter and receiver at separate stations – Having measuring – testing – or monitoring of system or part
Patent
1994-09-22
1996-08-20
Eisenzopf, Reinhard J.
Telecommunications
Transmitter and receiver at separate stations
Having measuring, testing, or monitoring of system or part
455 63, 455 70, 4551861, 4551932, 4551933, 4552261, H04B 1700
Patent
active
055488218
ABSTRACT:
A system for adaptive self-tuning of a receiver in a radio communication system. Prior to transmission of each data packet from a transmitter to a receiver, the transmitter generates a sequence of predefined test bytes (test sequence) n times at an initial carrier frequency. An identical version of the predefined test sequence is stored in the receiver. Circuitry is provided in the receiver for selected predefined states of tuning impedances for varying the center operating frequency of the receiver, wherein the predefined states of tuning impedances are equal in number to the predefined number of test sequences. A microcontroller in the receiver compares the received test sequence with the stored test sequence and creates a tuning table correlating respective states of the receiver tuning impedances with error bits detected in each state. The microcontroller then selects the tuning impedance state characterized by the least number of error bits, thereby selecting the optimal receiver center operating frequency to the initial carrier frequency generated by the transmitter. After the data has been transmitted by the transmitter at the initial carrier frequency and received by the receiver at the optimal center frequency, error detection is performed on the data. If the data has been received incorrectly, the transmitter changes its carrier frequency, the receiver changes its center frequency correspondingly, and the adaptive tuning test sequence is repeated.
REFERENCES:
patent: 3671868 (1972-06-01), Saunders
patent: 4210898 (1980-07-01), Betts
patent: 4850030 (1989-07-01), Hashimoto et al.
patent: 5105162 (1992-04-01), Fleissner
patent: 5146613 (1992-09-01), Anderson
patent: 5438699 (1995-08-01), Coveley
Eisenzopf Reinhard J.
Perry Stephen J.
Vo Nguyen
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