dc.contributor.advisor | Holte, Nils | nb_NO |
dc.contributor.author | Kristiansen, Børge Ellingsen | nb_NO |
dc.date.accessioned | 2014-12-19T13:44:08Z | |
dc.date.accessioned | 2015-12-22T11:41:57Z | |
dc.date.available | 2014-12-19T13:44:08Z | |
dc.date.available | 2015-12-22T11:41:57Z | |
dc.date.created | 2010-09-04 | nb_NO |
dc.date.issued | 2008 | nb_NO |
dc.identifier | 348596 | nb_NO |
dc.identifier.uri | http://hdl.handle.net/11250/2369370 | |
dc.description.abstract | Power amplifiers are nonlinear devices that traditionally have been tried linearized by means of predistortion. The nonlinear impact can be identified by sidelobes in the frequency domain. By accepting a certain sidelobe level, this implies that we also accept a somewhat nonlinear characteristic on the resulting cascade of our transmitter. The main question raised in this thesis is: How is the optimal nonlinear cascade that maximizes transmitted power defined when some given out-of-band spectral requirements are fulfilled? The problem has been limited such that examinations have been done on a single carrier system seen in context to a chosen set of out-of-band spectral requirements. The different nonlinear characteristics have been represented by means of B-splines. Thus, the results obtained are only the best set of parameters in the model utilized, and hence, only a sub-optimal solution to the problem. Results are presented for different spectral restrictions. Simulations performed suggest that a linear characteristic is the optimal, when restrictions are placed within the sidelobe level close to the mainlobe. When the first sidelobe is allowed to grow unlimited, a parameter set using 2-segments B-spline have proved to give the highest average transmitted | nb_NO |
dc.language | eng | nb_NO |
dc.publisher | Institutt for elektronikk og telekommunikasjon | nb_NO |
dc.subject | ntnudaim | no_NO |
dc.title | Optimization of the Resulting Characteristic for Power Amplifiers Using Predistortion | nb_NO |
dc.type | Master thesis | nb_NO |
dc.source.pagenumber | 52 | nb_NO |
dc.contributor.department | Norges teknisk-naturvitenskapelige universitet, Fakultet for informasjonsteknologi, matematikk og elektroteknikk, Institutt for elektronikk og telekommunikasjon | nb_NO |