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本文首先结合 PCM 二次群常用的线路码分析数字线路上传输的二元序列(即线路序列)的统计特性对于线路系统设计的影响,从而对线路序列的统计特性提出明确的限制。然后估计使用2048kb/s PCM 基群的8448kb/s 数字复用设备发送的数字序列的脉冲密度,并对8448kb/s数字通道的准比特序列独立性作具体的陈述。最后指出,使用级数适当的自同步扰码器,可以使8448kb/s 数字通道具有所需的准比特序列独立性。
In this paper, we first analyze the influence of the statistical properties of binary sequences (ie, line sequences) transmitted on digital lines to the design of line systems based on the commonly used line codes of PCM quadric clusters, and put forward definite limitations on the statistical characteristics of the line sequences. The pulse densities of the digital sequences sent by the 8448kb / s digital multiplex device using a 2048kb / s PCM population are then estimated, and the quasi-bit sequence independence of the 8448kb / s digital channel is stated in detail. Finally, it is pointed out that the 8448kb / s digital channel can be used with the required quasi-bit sequence independence using a suitable number of self-synchronizing scramblers.