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本发明是在窄带内存在强的噪声功率干扰源的信道中实现高质量数字传输的通信系统。以前,在以载波带内传输数字信号的系统中,一般采用的是高信噪比、容易实现的2、4以及8相位的调制通信系统。近来则采用8相2值或者多值正交调幅等调制方式,即同时调制振幅和相位两个参量的调制方式,目的是在限制带宽的情况下更多地传送信息。这些载波数字通信方式可共用第一图的方框来表示。由端11输入的2值数字信号在发端逻辑变换
The present invention is a communication system that achieves high quality digital transmission in a channel in which a strong source of noise power interference exists in a narrow band. In the past, in the system of transmitting digital signals in the carrier band, modulation and communication systems of 2,4 and 8 phases which are easy to realize with high signal-to-noise ratio are generally used. Recently, 8-phase 2-value or multi-value quadrature amplitude modulation and other modulation methods are used, that is, the modulation mode of two parameters of amplitude and phase is modulated at the same time, so as to transmit more information with limited bandwidth. These carrier digital communication methods can be shared by the box of the first figure. The binary digital signal input from terminal 11 is logically transformed at the origin