Method for reducing spurious reception locations in homodyne rec

Details Method for reducing spurious reception locations in homodyne rec Method for reducing spurious reception locations in homodyne rec

1996-07-17

1998-02-03

Faile, Andrew

Telecommunications

Receiver or analog modulated signal frequency converter

Noise or interference elimination

455310, 455317, 455318, 455324, 327355, H04B 110

Patent

active

057155305

ABSTRACT:
In a homodyne receiver for the reception of a carrier frequency signal with time-variant carrier frequency, an auxiliary signal is modulated onto the local oscillator signal selected corresponding to the current carrier frequency. A better separation of the local oscillator signals is thereby achieved by a band-pass filtering after the conversion of the carrier frequency signal into the base band. Compared to a homodyne receiver with time-variant carrier frequency but without auxiliary modulation, the RF switch for the selection of the local oscillator signal corresponding to the current carrier frequency can be realized simple and more economical. This advantage of the homodyne receiver is of particular economic significance for employment in mass-produced articles, such as in mobile and wireless communication systems.

REFERENCES:
patent: 4363139 (1982-12-01), Sullivan, Jr.
Patent Abstract of Japan, E-1487 Jan. 10, 1994, vol. 18, No. 10, Frequency Converter, JP 05-251937, dated 28 Sep. 1993.
H.J. Eul et al. Etablierung der Komplexen Messfaehigkeit Eines Homodynen Reflektometers Durch Unbekannte Standards Mit Hilfe Der Moebius-Transformation, (1989), vol. 33, pp. 1-12.

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