Title :
Digital precompensation of imperfections in quadrature modulators
Author :
Marchesani, Rossano
Author_Institution :
Thomson-CSF Electron. Syst. Italia, Scalo, Italy
fDate :
4/1/2000 12:00:00 AM
Abstract :
Residual carrier, balance, and quadrature error imperfections that are normally present in phase/quadrature modulators limit the use of direct modulation techniques in some applications. The classical precompensation techniques are revised and an adaptive solution proposed that improves performance by some order of magnitude
Keywords :
adaptive signal processing; convergence of numerical methods; error analysis; least mean squares methods; modulators; phase shift keying; quadrature amplitude modulation; QAM; adaptive LMS compensation; adaptive precompensation; balance error; digital precompensation; direct modulation techniques; fast convergence; performance; phase shift keying; phase/quadrature modulators; quadrature error imperfections; quadrature modulators; residual carrier; Convergence; Digital modulation; Digital relays; Frequency; Land mobile radio; Least squares approximation; Phase modulation; Predistortion; Resonance light scattering; TV broadcasting;
Journal_Title :
Communications, IEEE Transactions on
