Name
Abstract | ||
|---|---|---|
Radio transmitters capable of transforming variable envelope signals into constant envelope signals can be associated with high-efficiency switched mode power amplifiers. One of the techniques providing this conversion is Polar Sigma-Delta (ΣΔ) architecture. This approach provides efficient solution for high-dynamic signals, and, moreover, it offers flexibility in amultiradio environment. The overall concept of the polar ΣΔ transmitter is presented here along with novel modifications and improvements. Namely, when recombining the envelope and the phase signals, it is suggested to replace the analog mixing by a digital mixing. The impact of a frequency synthesizer with a switched loop bandwidth and its imperfections on the overall polar ΣΔ architecture is investigated as well. The Mobile WiMAX standard has been chosen for validation due to very high requirements in terms of power dynamics and the variable channel bandwidth. Simulation results are presented in this paper, and advantages and drawbacks of this novel approach are pointed here as well. |
Year | DOI | Venue |
|---|---|---|
2010 | 10.1155/2010/979120 | EURASIP J. Wireless Comm. and Networking |
Keywords | Field | DocType |
novel approach,novel modification,power dynamic,variable envelope signal,mode power amplifier,multiradio application,modified polar sigma-delta transmitter,overall concept,loop bandwidth,constant envelope signal,mobile wimax standard,variable channel bandwidth | Transmitter,Computer science,Computer network,Delta-sigma modulation,Frequency synthesizer,WiMAX,Polar,Constant envelope,Channel capacity,Amplifier | Journal |
Volume | Issue | ISSN |
2010, | 1 | 1687-1499 |
Citations | PageRank | References |
1 | 0.43 | 4 |
Authors | ||
5 | ||
Name | Order | Citations | PageRank |
|---|---|---|---|
| Martha Liliana Suárez Peñaloza | 1 | 70 | 3.79 |
| Vaclav Valenta | 2 | 74 | 4.95 |
| Geneviève Baudoin | 3 | 138 | 19.08 |
| Martine Villegas | 4 | 86 | 8.77 |
| Roman Maršálek | 5 | 1 | 0.77 |