IQ-modulator pre-distortion

Details IQ-modulator pre-distortion IQ-modulator pre-distortion

2005-02-24

2011-10-25

Fan, Chieh M (Department: 2611)

Pulse or digital communications

Transmitters

Antinoise or distortion

C375S297000, C375S298000, C375S295000, C455S114300, C455S069000, C455S114200, C330S149000, C330S152000

Reexamination Certificate

active

08045642

ABSTRACT:
An IQ-modulator pre-distorter includes means for pre-distorting each IQ-vector by a 2-dimensional linear transformation that depends on the value of the IQ-vector to be pre-distorted. The transformation is based on polynomials in the I- and Q-components. In a preferred embodiment the transformation is based on a 2×2 dimensional lookup table matrix, the elements (T11, T12, T21, T22) of which are sampled polynomials in the I- and Q-components of the IQ-vector.

REFERENCES:
patent: 4818931 (1989-04-01), Naegeli et al.
patent: 6236837 (2001-05-01), Midya
patent: 2004/0121741 (2004-06-01), Rashev et al.
patent: 1 359 719 (2003-11-01), None
Ghaderi, M. et al. Adaptive Predistortion Lineariser Using Polynomial Functions. IEEE Proceedings, Apr. 1994; vol. 141, Issue 2.

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