Method and apparatus for detecting and compensating for undesire

Details Method and apparatus for detecting and compensating for undesire Method and apparatus for detecting and compensating for undesire

1996-09-16

1999-04-13

Chan, Jason

Telecommunications

Transmitter

With feedback of modulated output signal

330109, 375261, H04B 104, H03F 132

Patent

active

058944966

ABSTRACT:
The present invention provides a method and apparatus for detecting and compensating for transmitter phase shift in a radio transmitter. A local oscillator generates a local oscillator signal. A modulator such as an I/Q modulator modulates input signals onto the local oscillator signal to generate a forward signal. That forward signal is amplified and otherwise prepared for transmission via an antenna. The transmitted signal is detected, and a phase adjuster substantially continuously detects and cancels undesired phase shifts in the detected signal caused by elements in the radio chain. A specific, example embodiment of the present invention is provided in a Cartesian feedback system wherein the phase of the feedback signal is detected and aligned with the phase of the original modulated signal, providing uncorrupted I and Q baseband feedback signals.

REFERENCES:
patent: 4079318 (1978-03-01), Kinoshita
patent: 5066923 (1991-11-01), Kinoshita
patent: 5381108 (1995-01-01), Whitmarsh et al.
patent: 5420536 (1995-05-01), Faulkner et al.
patent: 5483681 (1996-01-01), Bergsten et al.
patent: 5507017 (1996-04-01), Whitmarsh et al.
patent: 5551070 (1996-08-01), Skarby et al.
patent: 5623226 (1997-04-01), Whitmarsh et al.
patent: 5722056 (1998-02-01), Horowitz et al.
patent: 5748037 (1998-05-01), Rozental et al.

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