一、前言短波天波信道的衰落特性是影响无线电短波通信发展的关键因素，为克服这一影响，改善短波通信和质量，消除短波数据传输的码间干扰，适应短波信道高速数据传输的需要，以及在短波信道上实现数字保密话的舆，短波自适应通信系统除了应用自适应实时选频技术外，还需要采 I. Introduction The fading characteristics of shortwave sky wave channels are the key factors that affect the development of shortwave radio communications. In order to overcome this impact, to improve the shortwave communication and quality, eliminate the inter-symbol interference of shortwave data transmission and meet the needs of high-speed data transmission of shortwave channels, and In the shortwave channel to achieve digital security words, shortwave adaptive communication system in addition to the application of adaptive real-time frequency selection technology, but also need to adopt