Pulse or digital communications – Transmitters – Antinoise or distortion
Reexamination Certificate
2002-10-29
2008-12-02
Burd, Kevin M (Department: 2611)
Pulse or digital communications
Transmitters
Antinoise or distortion
Reexamination Certificate
active
07460613
ABSTRACT:
A solution is disclosed for achieving a functional complex base-band adaptive digital nonlinear device model providing RF-power amplifier distortion (i.e. linearization or pre-distortion) minimizing distortion characterization including memory effects. The present inventive solution is based on real device non-linear performance observations and the physical cause for the distortion is compensated in the application. This also means that a pre-distorter digital circuit is derived to have the inverse functionality of the digital device model. The model and the digital pre-distortion circuit are designed in such way, that function blocks are connected in cascade. Each function block is then designed to handle a certain type of distortion performance and can be optimized individually. The model gives possibilities to describe and evaluate different device properties. An accurate AM to AM and AM to PM characterization can be evaluated and the frequency response of the device when excited with envelope-modulated signals can be evaluated. The properties evaluated can also be used in a test procedure in a production facility to verify production quality.
REFERENCES:
patent: 4291277 (1981-09-01), Davis et al.
patent: 4855737 (1989-08-01), Poole
patent: 5049832 (1991-09-01), Cavers
patent: 5218620 (1993-06-01), Mori et al.
patent: 5272721 (1993-12-01), Mikoshiba et al.
patent: 5417114 (1995-05-01), Wadaka et al.
patent: 5485120 (1996-01-01), Anvari
patent: 5500871 (1996-03-01), Kato et al.
patent: 5724381 (1998-03-01), Endo et al.
patent: 5774494 (1998-06-01), Sawahashi et al.
patent: 5856998 (1999-01-01), Durrant et al.
patent: 5923712 (1999-07-01), Leyendecker et al.
patent: 5949283 (1999-09-01), Proctor et al.
patent: 5959500 (1999-09-01), Garrido
patent: 6005903 (1999-12-01), Mendelovicz
patent: 6246286 (2001-06-01), Persson
patent: 6545535 (2003-04-01), Andre
patent: 6741662 (2004-05-01), Francos et al.
patent: 2006/0034448 (2006-02-01), Parry
Cavers, “Amplifier Linearization Using a Digital Predistorter with Fast Adaptation and Low Memory Requirements,” IEEE Transactions on Vehicular Technology, vol. 39, No. 4, Nov. 1990, pp. 374-382.
Wright et al., “Experimental Performance of an Adaptive Digital Linearized Amplifier,” IEEE Transactions on Vehicular Technology, vol. 41, No. 4, Nov. 1992, pp. 395-400.
Burd Kevin M
Nixon & Vanderhye P.C.
Telefonaktiebolaget LM Ericsson (publ)
LandOfFree
Digital linearization circuit does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Digital linearization circuit, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Digital linearization circuit will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-4038531