Dual band architectures for mobile stations having transmitter l

Details Dual band architectures for mobile stations having transmitter l Dual band architectures for mobile stations having transmitter l

1997-12-31

2000-09-26

Eisenzopf, Reinhard J.

Telecommunications

Transmitter

With feedback of modulated output signal

455552, 455313, 375296, H01Q 1112

Patent

active

061252662

ABSTRACT:
This invention teaches methods and apparatus for providing a low cost, low complexity, and low component count transmitter feedback function for use in mobile station transmitter linearization and self-test operations. Disclosed is a method for operating a mobile station of a type that includes a transmit chain having an output coupled to an antenna and a receive chain having an input coupled to the same or a different antenna. The method includes steps of: during a transmission time, (a) sampling an amplified signal prior to the amplified signal being applied to the antenna for transmission from the transmit chain; (b) downconverting a frequency of the sampled amplified signal to a lower frequency signal using a receive chain local oscillator signal normally used for downconverting a received signal to the first IF; and (c) demodulating the lower frequency signal to a baseband signal with a receive chain demodulator by using a second local oscillator signal that is normally used as a transmit chain modulator injection frequency signal. A further step of the method determines from the baseband signal an amount of predistortion of an input signal to the transmit chain in order to obtain a desired amount of linearization of the amplified signal.

REFERENCES:
patent: 4501018 (1985-02-01), Shanley et al.
patent: 5124672 (1992-06-01), Kuisma
patent: 5291474 (1994-03-01), Ikonen et al.
patent: 5301367 (1994-04-01), Heinonen
patent: 5390168 (1995-02-01), Vimpari
patent: 5392460 (1995-02-01), Mattila et al.
patent: 5414431 (1995-05-01), McCoskey
patent: 5423076 (1995-06-01), Westergren et al.
patent: 5471652 (1995-11-01), Hulkko
patent: 5475677 (1995-12-01), Arnold et al.
patent: 5507014 (1996-04-01), Wray et al.
patent: 5519885 (1996-05-01), Vaisanen
patent: 5574990 (1996-11-01), Flanagan
patent: 5722056 (1998-02-01), Horowitz et al.
patent: 5740520 (1998-04-01), Cyze et al.
patent: 5758266 (1998-05-01), Kornfeld et al.
patent: 5758294 (1998-05-01), Ganesan et al.
patent: 5812951 (1998-09-01), Ganesan et al.
patent: 5867065 (1999-02-01), Leyendecker
patent: 5894496 (1999-04-01), Jones
patent: 5905760 (1999-05-01), Schnabl et al.
"High Frequency Part Of A Real Time Test Mobile Station For UMTS System Evaluations", Kari Lehtinen et al., 24.sup.th European Microwave Conference, vol. 2, pp. 1575-1580, Sep. 1994.
"GSM And Dect-A Dual Mode Solution", Rashidzadeh et al., Mobile Communications International 21, Apr. 1995, pp. 57-60.

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