Base station transmitter having digital predistorter and...

Details Base station transmitter having digital predistorter and... Base station transmitter having digital predistorter and...

2005-12-06

2005-12-06

Chin, Stephen (Department: 2634)

Pulse or digital communications

Transmitters

Antinoise or distortion

C327S291000, C330S149000, C332S106000, C341S020000, C341S173000, C375S285000, C375S295000, C375S296000, C375S297000

Reexamination Certificate

active

06973139

ABSTRACT:
A base station transmitter having a digital predistorter and predistortion method is disclosed. The predistortion is accomplished by delaying a digital input signal, predistorted by a predistortion unit, for a predetermined time. A coefficient of a non-linear characteristic model of a power amplifier is generated using a digital output signal, converted from an amplified output signal of the power amplifier, and the delayed digital input signal. A reference signal is randomly generated to produce a predistortion model having a characteristic opposite to the non-linear characteristic of the power amplifier. A predistortion error function is extracted by subtracting the reference signal and the non-linear characteristic model of the power amplifier, after the produced coefficient is applied to the model. A coefficient of the predistortion unit is controlled adaptively using the predistortion error function. Thus, the present invention increases a precision of predistortion, the linearity of the base station transmitter, and the performance of a base transceiver system.

REFERENCES:
patent: 4291277 (1981-09-01), Davis et al.
patent: 5148448 (1992-09-01), Karam et al.
patent: 6388513 (2002-05-01), Wright et al.
patent: 6775330 (2004-08-01), Bach et al.
patent: 2002/0050372 (2002-05-01), Lee
patent: 2002/0171485 (2002-11-01), Cova

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