EP 1709729 A1 20061011 - TRANSMITTER PREDISTORTION CIRCUIT AND METHOD THEREFOR
Title (en)
TRANSMITTER PREDISTORTION CIRCUIT AND METHOD THEREFOR
Title (de)
SENDER-VORVERZERRUNGSSCHALTUNG UND VERFAHREN DAFÜR
Title (fr)
CIRCUIT DE DISTORSION PREALABLE POUR EMETTEUR ET PROCEDE CORRESPONDANT
Publication
Application
Priority
- US 2005002316 W 20050124
- US 76677904 A 20040127
- US 76676804 A 20040127
- US 76680104 A 20040127
- US 84073504 A 20040506
- US 1242704 A 20041214
Abstract (en)
[origin: TW200541280A] A digital communications transmitter (100) includes a digital linear-and-nonlinear predistortion section (200, 1800, 2800) to compensate for linear and nonlinear distortion introduced by transmitter-analog components (120). A direct-digital-downconversion section (300) generates a complex digital return-data stream (254) from the analog components (120) without introducing quadrature imbalance. A relatively low resolution exhibited by the return-data stream (254) is effectively increased through arithmetic processing. Distortion introduced by an analog-to digital converter (304) may be compensated using a variety of adaptive techniques. Linear distortion is compensated using adaptive techniques with an equalizer (246) positioned in the forward-data stream (112). Nonlinear distortion is then compensated using adaptive techniques with a plurality of equalizers (226) that filter a plurality of orthogonal, higher-ordered-basis functions (214) generated from the forward-data stream (112). The filtered-basis functions are combined together and subtracted from the forward-data stream (112).
IPC 8 full level
CPC (source: EP)
H03F 1/3247 (2013.01); H03F 3/189 (2013.01); H03F 3/24 (2013.01); H04L 27/368 (2013.01); H03F 2200/165 (2013.01); H03F 2200/171 (2013.01); H03F 2200/336 (2013.01); H03F 2200/451 (2013.01)
Designated contracting state (EPC)
AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LI LT LU MC NL PL PT RO SE SI SK TR
DOCDB simple family (publication)
BR PI0507137 A 20070619; EP 1709729 A1 20061011; EP 1709729 A4 20061227; TW 200541280 A 20051216
DOCDB simple family (application)
BR PI0507137 A 20050124; EP 05711985 A 20050124; TW 94102132 A 20050125