高速数字通信系统,象任何通t信系统一样,在执行预期任务的时候,接收端要正确地解释被发送的信息。就最终的用户而言，这就是要忠实地复现语音或图像,或能准确地传送财务信息。从工程角度看，性能的定量化通常与实际被发送的信息无关。当通信为数字格式时,情况较为简单,所有发送 High-speed digital communications systems, like any communications system, receive the correct interpretation of the information being sent while performing the intended tasks. In the case of the end user, this is to faithfully reproduce the voice or image or to accurately convey the financial information. From an engineering point of view, performance quantification is often not related to the actual information being sent. When the communication is in digital format, the situation is simpler, all sent