Adaptation of IQ-error compensation

Details Adaptation of IQ-error compensation Adaptation of IQ-error compensation

2005-05-17

2010-06-22

Liu, Shuwang (Department: 2611)

Pulse or digital communications

Transmitters

Antinoise or distortion

C375S269000, C375S297000, C375S295000

Reexamination Certificate

active

07742539

ABSTRACT:
A radio transmitter with IQ-modulator error compensation includes a homodyne observation receiver (42) producing a first real baseband (S5) signal from a real radio frequency signal (S2). A real-value extracting element (44) and a down-sampler (46) convert a complex baseband signal (S1) into a second real baseband signal. An adapter (40) determines parameters controlling an IQ-error compensator (12) by minimizing the error between the two real baseband signals. In a preferred embodiment he transmitter also includes a phase shifter (56) providing three different phase shifts to compensate for the fact that the homodyne observation receiver produces a real and not a complex signal.

REFERENCES:
patent: 6104239 (2000-08-01), Jenkins
patent: 7085330 (2006-08-01), Shirali
patent: 7215716 (2007-05-01), Smith
patent: 7403573 (2008-07-01), DeBruyn et al.
patent: 7415250 (2008-08-01), Sasaki et al.
patent: 2002/0034260 (2002-03-01), Kim
patent: 2002/0181611 (2002-12-01), Kim
patent: 2004/0057533 (2004-03-01), Kermalli
patent: WO 0217586 (2002-02-01), None
patent: WO 03017466 (2003-02-01), None

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