中波单边带立体声广播发射系统，除要求高质量传送信息外，由于其发射功率较大，因此，如何提高发射机效率也是至关重要的问题。
The MW SSB stereo broadcasting system requires high efficiency of the transmitter which usually employs high power amplifier, as the high quality of information transmission is important.
于是多种不同功率放大器的线性化技术被采用来改善无线发射机的线性度及效率。
Various PA linearization techniques have been adopted to improve linearity and power efficiency of wireless transmitters.
而功率放大器又具有非线性特性，因此要设计高效率又高线性度的无线发射机便成了一个相当困难的挑战。
Designing a high linearity and high power efficiency wireless transmitter is a big challenge due to the nonlinear characteristic of the power amplifier.
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