短波线路压扩器并非一种新的概念，它的目的是为了充分利用发射机的发射功率，提高接收端的信噪比．传统的压缩扩张技术实现的线路复杂，对器件与线路的精度要求高．所以采用传统的压缩扩张技术很难达到预期的效果，限制了它在实际中的应用．若采用基于小波分析的多基编码技术与压缩扩张相结合的方法，不但在提高接收端信噪比方面取得了良好的效果，而且实现的方法简单，实时性能好。 Shortwave line compander is not a new concept, its purpose is to make full use of the transmitter transmit power and improve the receiver SNR. Compression and expansion of traditional lines to achieve complex, high precision devices and lines. So using the traditional compression expansion technology is difficult to achieve the desired results, limiting its practical application. If the method based on wavelet analysis is combined with compression and expansion, the method not only improves the signal-noise ratio at the receiver, but also achieves a simple method and real-time performance.