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该论文提出了一种用于软件无线电发射机的异相功率放大器，利用饱和功放的高效率来实现幅度调制，解决了传统I-Q上变频线性功放效率低的问题。
transmitter needs a universal modulator and power amplifier to support any modulation in any band. There is a simple solution, namely, a Cartesian I-Q upconverter followed by a linear power amplifier, but for complex modulations its power conversion efficiency is often under 10%. Therefore, the search continues for a more efficient solution. One possibility is to harness the high efficiency of a saturated power amplifier but somehow make it deliver amplitude-modulated waveforms. Polar modulation has found use in enabling EDGE on GSM handsets, but we believe outphasing [1], or linear amplification using nonlinear components (LINC), offers a more enduring solution for a broader class of modulations. We present an SDR PA based on the outphasing technique. An
Shervin Moloudi1, Koji Takinami2, Michael Youssef1,
Mohyee Mikhemar1, Asad Abidi1 1 University of California, Los Angeles, CA Panasonic Emerging Advanced RF Labs, Santa Clara, CA 2 A software-defined radio (SDR)