Adaptive system for self-tuning a receiver in an RF communicatio

Details Adaptive system for self-tuning a receiver in an RF communicatio Adaptive system for self-tuning a receiver in an RF communicatio

1994-02-14

1995-08-01

Urban, Edward F.

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

054386993

ABSTRACT:
A system for adaptive self-tuning of a receiver in a radio communication system. Prior to transmission of each data package from a transmitter to a receiver, the transmitter generates a sequence of predefined test bytes (test sequence) n times. 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 central operating frequency to the carrier frequency generated by the transmitter.

REFERENCES:
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patent: 5077783 (1991-12-01), Leppanen
patent: 5105162 (1992-04-01), Fleissner et al.
patent: 5115515 (1992-05-01), Yamamoto et al.
patent: 5146613 (1992-09-01), Anderson
patent: 5201063 (1993-04-01), Tam et al.
patent: 5230091 (1993-07-01), Vaisanen
patent: 5313656 (1994-05-01), Vaisanen et al.

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