The approach adopted in Digital Synthesizers and Transmitters for Software Radio will provide an understanding of key areas in the field of digital synthesizers and transmitters. It is easy to include different digital techniques in the digital synthesizers and transmitters by using digital signal processing methods, because the signal is in digital form. By programming the digital synthesizers and transmitters, adaptive channel bandwidths, modulation formats, frequency hopping and data rates are easily achieved. Techniques such as digital predistortion for power amplifier linearization, digital compensation methods for analog I/Q modulator nonlinearities and digital power control and ramping are presented in this book. The flexibility of the digital synthesizers and transmitters makes them ideal as signal generators for software radio. Software radios represent a major change in the design paradigm for radios in which a large portion of the functionality is implemented through programmable signal processing devices, giving the radio the ability to change its operating parameters to accommodate new features and capabilities. A software radio approach reduces the content of radio frequency (RF) and other analog components of traditional radios and emphasizes digital signal processing to enhance overall transmitter flexibility. Software radios are emerging in commercial and military infrastructure.

Contenuti

1. Transmitters.- 2. Power Amplifier Linearization.- 3. Digital Compensation Methods for Analog I/Q Modulator Errors.- 4. Direct Digital Synthesizers.- 5. Recursive Oscillators.- 6. Cordic Algorithm.- 7. Sources of Noise and Spurs in DDS.- 8. Spur Reduction Techniques in Sine Output Direct Digital Synthesizer.- 9. Blocks of Direct Digital Synthesizers.- 10. Current Steering D/A Converters.- 11. Pulse Shaping and Interpolation Filters.- 12. Re-Sampling.- 13. Fir Filters for Compensating D/A Converter Frequency Response Distortion.- 14. A Direct Digital Synthesizer with Tunable Delta Sigma Modulator.- 15. A Digital Quadrature Modulator with On-chip D/A Converter.- 16. A GSM/EDGE/WCDMA Modulator with On-chip D/A Converter for Base Stations.- 17. Effect of Clipping in Wideband CDMA System and Simple Algorithm for Peak Windowing.- 18. Reducing Peak to Average Ratio of Multicarrier GSM and EDGE Signals.

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