Method and system for detecting encoded radio signals

Details Method and system for detecting encoded radio signals Method and system for detecting encoded radio signals

1986-08-11

1988-11-08

Yusko, Donald J.

Communications: electrical

Continuously variable indicating

With meter reading

340825770, 455 63, 375 76, H04Q 702, H04B 1700

Patent

active

047836580

ABSTRACT:
A method for detecting an encoded radio signal involves comparing the received signal amplitude with a predetermined threshold amplitude. The difference between the received signal-component amplitude and the noise-component amplitude is derived and used to adjust the threshold amplitude. By adjustng the threshold amplitude depending upon the difference between the signal-component amplitude and the noise-component amplitude, mis-detection which could occur otherwise when the reception amplitude of the noise component is relatively high or the reception amplitude of the signal component is relatively low can be successfully and satisfactorily avoided. In order to implement the foregoing process, an encoded radio signal detecting system comprises detecting means separately detecting the signal-component amplitude and the noise-component amplitude, arithmetic means for deriving the difference between the received signal-component amplitude and the noise-component amplitude and deriving a value proportional to the derived difference, which derived value serves as a threshold amplitude, and comparator means for comparing the received signal amplitude with the threshold amplitude, thereby detecting the presence or absence of encoded radio signals.

REFERENCES:
patent: 3196440 (1965-07-01), Weinstein
patent: 4309674 (1982-01-01), Owen
patent: 4479255 (1984-10-01), Geesen et al.
patent: 4554542 (1985-11-01), Dolikian
patent: 4619002 (1986-10-01), Thro

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