I/Q modulator with carrier predistortion

Details I/Q modulator with carrier predistortion I/Q modulator with carrier predistortion

2007-12-04

2007-12-04

Payne, David C. (Department: 2611)

Pulse or digital communications

Transmitters

Antinoise or distortion

C375S223000, C375S271000, C375S278000, C375S284000, C375S285000, C375S302000, C381S013000, C398S193000, C455S110000, C455S114300

Reexamination Certificate

active

10221632

ABSTRACT:
An I/Q modulator used for processing an I/Q signal to obtain a predistorted output signal. The I/Q signal has an I component and a Q component, and comprises a predistorter for predistorting, with a predistortion signal, a carrier signal, which comprises a first subcomponent and a second subcomponent that is substantially orthogonal to the first subcomponent, to obtain first and second predistorted subcomponents of the carrier signal. The predistortion signal depends on the I and Q components. A first multiplier multiples the I component by the first predistorted subcomponent to obtain a multiplied I component. A second multiplier multiples the Q component by the second predistorted subcomponent to obtain a multiplied Q component. An adder adds the multiplied I component and the negative multiplied Q component to obtain the predistorted output signal. Thus, a simplification of the I/Q modulator and a reduction in the number of necessary multipliers is achieved.

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M. Ghaderi, S. Kumar, D.E. Dodds; Adaptive Predistortion Lineariser Using Polynomial Functions; Apr. 1994; IEE Proceedings—Communications; vol. 141; pp. 49-55.
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